add python dependencies

.CondaPkg/env/Tools/scripts/2to3.py

@@ -0,0 +1,5 @@
+#!/usr/bin/env python3
+import sys
+from lib2to3.main import main
+
+sys.exit(main("lib2to3.fixes"))

.CondaPkg/env/Tools/scripts/checkpip.py

@@ -0,0 +1,32 @@
+#!/usr/bin/env python3
+"""
+Checks that the version of the projects bundled in ensurepip are the latest
+versions available.
+"""
+import ensurepip
+import json
+import urllib.request
+import sys
+
+
+def main():
+    outofdate = False
+
+    for project, version in ensurepip._PROJECTS:
+        data = json.loads(urllib.request.urlopen(
+            "https://pypi.org/pypi/{}/json".format(project),
+            cadefault=True,
+        ).read().decode("utf8"))
+        upstream_version = data["info"]["version"]
+
+        if version != upstream_version:
+            outofdate = True
+            print("The latest version of {} on PyPI is {}, but ensurepip "
+                  "has {}".format(project, upstream_version, version))
+
+    if outofdate:
+        sys.exit(1)
+
+
+if __name__ == "__main__":
+    main()

.CondaPkg/env/Tools/scripts/combinerefs.py

@@ -0,0 +1,129 @@
+#! /usr/bin/env python3
+
+"""
+combinerefs path
+
+A helper for analyzing PYTHONDUMPREFS output.
+
+When the PYTHONDUMPREFS envar is set in a debug build, at Python shutdown
+time Py_FinalizeEx() prints the list of all live objects twice:  first it
+prints the repr() of each object while the interpreter is still fully intact.
+After cleaning up everything it can, it prints all remaining live objects
+again, but the second time just prints their addresses, refcounts, and type
+names (because the interpreter has been torn down, calling repr methods at
+this point can get into infinite loops or blow up).
+
+Save all this output into a file, then run this script passing the path to
+that file.  The script finds both output chunks, combines them, then prints
+a line of output for each object still alive at the end:
+
+    address refcnt typename repr
+
+address is the address of the object, in whatever format the platform C
+produces for a %p format code.
+
+refcnt is of the form
+
+    "[" ref "]"
+
+when the object's refcount is the same in both PYTHONDUMPREFS output blocks,
+or
+
+    "[" ref_before "->" ref_after "]"
+
+if the refcount changed.
+
+typename is Py_TYPE(object)->tp_name, extracted from the second PYTHONDUMPREFS
+output block.
+
+repr is repr(object), extracted from the first PYTHONDUMPREFS output block.
+CAUTION:  If object is a container type, it may not actually contain all the
+objects shown in the repr:  the repr was captured from the first output block,
+and some of the containees may have been released since then.  For example,
+it's common for the line showing the dict of interned strings to display
+strings that no longer exist at the end of Py_FinalizeEx; this can be recognized
+(albeit painfully) because such containees don't have a line of their own.
+
+The objects are listed in allocation order, with most-recently allocated
+printed first, and the first object allocated printed last.
+
+
+Simple examples:
+
+    00857060 [14] str '__len__'
+
+The str object '__len__' is alive at shutdown time, and both PYTHONDUMPREFS
+output blocks said there were 14 references to it.  This is probably due to
+C modules that intern the string "__len__" and keep a reference to it in a
+file static.
+
+    00857038 [46->5] tuple ()
+
+46-5 = 41 references to the empty tuple were removed by the cleanup actions
+between the times PYTHONDUMPREFS produced output.
+
+    00858028 [1025->1456] str '<dummy key>'
+
+The string '<dummy key>', which is used in dictobject.c to overwrite a real
+key that gets deleted, grew several hundred references during cleanup.  It
+suggests that stuff did get removed from dicts by cleanup, but that the dicts
+themselves are staying alive for some reason. """
+
+import re
+import sys
+
+# Generate lines from fileiter.  If whilematch is true, continue reading
+# while the regexp object pat matches line.  If whilematch is false, lines
+# are read so long as pat doesn't match them.  In any case, the first line
+# that doesn't match pat (when whilematch is true), or that does match pat
+# (when whilematch is false), is lost, and fileiter will resume at the line
+# following it.
+def read(fileiter, pat, whilematch):
+    for line in fileiter:
+        if bool(pat.match(line)) == whilematch:
+            yield line
+        else:
+            break
+
+def combinefile(f):
+    fi = iter(f)
+
+    for line in read(fi, re.compile(r'^Remaining objects:$'), False):
+        pass
+
+    crack = re.compile(r'([a-zA-Z\d]+) \[(\d+)\] (.*)')
+    addr2rc = {}
+    addr2guts = {}
+    before = 0
+    for line in read(fi, re.compile(r'^Remaining object addresses:$'), False):
+        m = crack.match(line)
+        if m:
+            addr, addr2rc[addr], addr2guts[addr] = m.groups()
+            before += 1
+        else:
+            print('??? skipped:', line)
+
+    after = 0
+    for line in read(fi, crack, True):
+        after += 1
+        m = crack.match(line)
+        assert m
+        addr, rc, guts = m.groups() # guts is type name here
+        if addr not in addr2rc:
+            print('??? new object created while tearing down:', line.rstrip())
+            continue
+        print(addr, end=' ')
+        if rc == addr2rc[addr]:
+            print('[%s]' % rc, end=' ')
+        else:
+            print('[%s->%s]' % (addr2rc[addr], rc), end=' ')
+        print(guts, addr2guts[addr])
+
+    print("%d objects before, %d after" % (before, after))
+
+def combine(fname):
+    with open(fname) as f:
+        combinefile(f)
+
+if __name__ == '__main__':
+    combine(sys.argv[1])

.CondaPkg/env/Tools/scripts/divmod_threshold.py

@@ -0,0 +1,56 @@
+#!/usr/bin/env python3
+#
+# Determine threshold for switching from longobject.c divmod to
+# _pylong.int_divmod().
+
+from random import randrange
+from time import perf_counter as now
+from _pylong import int_divmod as divmod_fast
+
+BITS_PER_DIGIT = 30
+
+
+def rand_digits(n):
+    top = 1 << (n * BITS_PER_DIGIT)
+    return randrange(top >> 1, top)
+
+
+def probe_den(nd):
+    den = rand_digits(nd)
+    count = 0
+    for nn in range(nd, nd + 3000):
+        num = rand_digits(nn)
+        t0 = now()
+        e1, e2 = divmod(num, den)
+        t1 = now()
+        f1, f2 = divmod_fast(num, den)
+        t2 = now()
+        s1 = t1 - t0
+        s2 = t2 - t1
+        assert e1 == f1
+        assert e2 == f2
+        if s2 < s1:
+            count += 1
+            if count >= 3:
+                print(
+                    "for",
+                    nd,
+                    "denom digits,",
+                    nn - nd,
+                    "extra num digits is enough",
+                )
+                break
+        else:
+            count = 0
+    else:
+        print("for", nd, "denom digits, no num seems big enough")
+
+
+def main():
+    for nd in range(30):
+        nd = (nd + 1) * 100
+        probe_den(nd)
+
+
+if __name__ == '__main__':
+    main()

.CondaPkg/env/Tools/scripts/pydoc3.py

@@ -0,0 +1,5 @@
+#!/usr/bin/env python3
+
+import pydoc
+if __name__ == '__main__':
+    pydoc.cli()

.CondaPkg/env/Tools/scripts/run_tests.py

@@ -0,0 +1,92 @@
+"""Run Python's test suite in a fast, rigorous way.
+
+The defaults are meant to be reasonably thorough, while skipping certain
+tests that can be time-consuming or resource-intensive (e.g. largefile),
+or distracting (e.g. audio and gui). These defaults can be overridden by
+simply passing a -u option to this script.
+
+"""
+
+import os
+import shlex
+import sys
+import sysconfig
+import test.support
+
+
+def is_multiprocess_flag(arg):
+    return arg.startswith('-j') or arg.startswith('--multiprocess')
+
+
+def is_resource_use_flag(arg):
+    return arg.startswith('-u') or arg.startswith('--use')
+
+def is_python_flag(arg):
+    return arg.startswith('-p') or arg.startswith('--python')
+
+
+def main(regrtest_args):
+    args = [sys.executable,
+            '-u',                 # Unbuffered stdout and stderr
+            '-W', 'default',      # Warnings set to 'default'
+            '-bb',                # Warnings about bytes/bytearray
+            ]
+
+    cross_compile = '_PYTHON_HOST_PLATFORM' in os.environ
+    if (hostrunner := os.environ.get("_PYTHON_HOSTRUNNER")) is None:
+        hostrunner = sysconfig.get_config_var("HOSTRUNNER")
+    if cross_compile:
+        # emulate -E, but keep PYTHONPATH + cross compile env vars, so
+        # test executable can load correct sysconfigdata file.
+        keep = {
+            '_PYTHON_PROJECT_BASE',
+            '_PYTHON_HOST_PLATFORM',
+            '_PYTHON_SYSCONFIGDATA_NAME',
+            'PYTHONPATH'
+        }
+        environ = {
+            name: value for name, value in os.environ.items()
+            if not name.startswith(('PYTHON', '_PYTHON')) or name in keep
+        }
+    else:
+        environ = os.environ.copy()
+        args.append("-E")
+
+    # Allow user-specified interpreter options to override our defaults.
+    args.extend(test.support.args_from_interpreter_flags())
+
+    args.extend(['-m', 'test',    # Run the test suite
+                 '-r',            # Randomize test order
+                 '-w',            # Re-run failed tests in verbose mode
+                 ])
+    if sys.platform == 'win32':
+        args.append('-n')         # Silence alerts under Windows
+    if not any(is_multiprocess_flag(arg) for arg in regrtest_args):
+        if cross_compile and hostrunner:
+            # For now use only two cores for cross-compiled builds;
+            # hostrunner can be expensive.
+            args.extend(['-j', '2'])
+        else:
+            args.extend(['-j', '0'])  # Use all CPU cores
+    if not any(is_resource_use_flag(arg) for arg in regrtest_args):
+        args.extend(['-u', 'all,-largefile,-audio,-gui'])
+
+    if cross_compile and hostrunner:
+        # If HOSTRUNNER is set and -p/--python option is not given, then
+        # use hostrunner to execute python binary for tests.
+        if not any(is_python_flag(arg) for arg in regrtest_args):
+            buildpython = sysconfig.get_config_var("BUILDPYTHON")
+            args.extend(["--python", f"{hostrunner} {buildpython}"])
+
+    args.extend(regrtest_args)
+
+    print(shlex.join(args))
+    if sys.platform == 'win32':
+        from subprocess import call
+        sys.exit(call(args))
+    else:
+        os.execve(sys.executable, args, environ)
+
+
+if __name__ == '__main__':
+    main(sys.argv[1:])

.CondaPkg/env/Tools/scripts/summarize_stats.py

@@ -0,0 +1,652 @@
+"""Print a summary of specialization stats for all files in the
+default stats folders.
+"""
+
+import argparse
+import collections
+import json
+import os.path
+import opcode
+from datetime import date
+import itertools
+import sys
+
+if os.name == "nt":
+    DEFAULT_DIR = "c:\\temp\\py_stats\\"
+else:
+    DEFAULT_DIR = "/tmp/py_stats/"
+
+#Create list of all instruction names
+specialized = iter(opcode._specialized_instructions)
+opname = ["<0>"]
+for name in opcode.opname[1:]:
+    if name.startswith("<"):
+        try:
+            name = next(specialized)
+        except StopIteration:
+            pass
+    opname.append(name)
+
+# opcode_name --> opcode
+# Sort alphabetically.
+opmap = {name: i for i, name in enumerate(opname)}
+opmap = dict(sorted(opmap.items()))
+
+TOTAL = "specialization.hit", "specialization.miss", "execution_count"
+
+def format_ratio(num, den):
+    """
+    Format a ratio as a percentage. When the denominator is 0, returns the empty
+    string.
+    """
+    if den == 0:
+        return ""
+    else:
+        return f"{num/den:.01%}"
+
+def join_rows(a_rows, b_rows):
+    """
+    Joins two tables together, side-by-side, where the first column in each is a
+    common key.
+    """
+    if len(a_rows) == 0 and len(b_rows) == 0:
+        return []
+
+    if len(a_rows):
+        a_ncols = list(set(len(x) for x in a_rows))
+        if len(a_ncols) != 1:
+            raise ValueError("Table a is ragged")
+
+    if len(b_rows):
+        b_ncols = list(set(len(x) for x in b_rows))
+        if len(b_ncols) != 1:
+            raise ValueError("Table b is ragged")
+
+    if len(a_rows) and len(b_rows) and a_ncols[0] != b_ncols[0]:
+        raise ValueError("Tables have different widths")
+
+    if len(a_rows):
+        ncols = a_ncols[0]
+    else:
+        ncols = b_ncols[0]
+
+    default = [""] * (ncols - 1)
+    a_data = {x[0]: x[1:] for x in a_rows}
+    b_data = {x[0]: x[1:] for x in b_rows}
+
+    if len(a_data) != len(a_rows) or len(b_data) != len(b_rows):
+        raise ValueError("Duplicate keys")
+
+    # To preserve ordering, use A's keys as is and then add any in B that aren't
+    # in A
+    keys = list(a_data.keys()) + [k for k in b_data.keys() if k not in a_data]
+    return [(k, *a_data.get(k, default), *b_data.get(k, default)) for k in keys]
+
+def calculate_specialization_stats(family_stats, total):
+    rows = []
+    for key in sorted(family_stats):
+        if key.startswith("specialization.failure_kinds"):
+            continue
+        if key in ("specialization.hit", "specialization.miss"):
+            label = key[len("specialization."):]
+        elif key == "execution_count":
+            continue
+        elif key in ("specialization.success",  "specialization.failure", "specializable"):
+            continue
+        elif key.startswith("pair"):
+            continue
+        else:
+            label = key
+        rows.append((f"{label:>12}", f"{family_stats[key]:>12}", format_ratio(family_stats[key], total)))
+    return rows
+
+def calculate_specialization_success_failure(family_stats):
+    total_attempts = 0
+    for key in ("specialization.success",  "specialization.failure"):
+        total_attempts += family_stats.get(key, 0)
+    rows = []
+    if total_attempts:
+        for key in ("specialization.success",  "specialization.failure"):
+            label = key[len("specialization."):]
+            label = label[0].upper() + label[1:]
+            val = family_stats.get(key, 0)
+            rows.append((label, val, format_ratio(val, total_attempts)))
+    return rows
+
+def calculate_specialization_failure_kinds(name, family_stats, defines):
+    total_failures = family_stats.get("specialization.failure", 0)
+    failure_kinds = [ 0 ] * 40
+    for key in family_stats:
+        if not key.startswith("specialization.failure_kind"):
+            continue
+        _, index = key[:-1].split("[")
+        index = int(index)
+        failure_kinds[index] = family_stats[key]
+    failures = [(value, index) for (index, value) in enumerate(failure_kinds)]
+    failures.sort(reverse=True)
+    rows = []
+    for value, index in failures:
+        if not value:
+            continue
+        rows.append((kind_to_text(index, defines, name), value, format_ratio(value, total_failures)))
+    return rows
+
+def print_specialization_stats(name, family_stats, defines):
+    if "specializable" not in family_stats:
+        return
+    total = sum(family_stats.get(kind, 0) for kind in TOTAL)
+    if total == 0:
+        return
+    with Section(name, 3, f"specialization stats for {name} family"):
+        rows = calculate_specialization_stats(family_stats, total)
+        emit_table(("Kind", "Count", "Ratio"), rows)
+        rows = calculate_specialization_success_failure(family_stats)
+        if rows:
+            print_title("Specialization attempts", 4)
+            emit_table(("", "Count:", "Ratio:"), rows)
+            rows = calculate_specialization_failure_kinds(name, family_stats, defines)
+            emit_table(("Failure kind", "Count:", "Ratio:"), rows)
+
+def print_comparative_specialization_stats(name, base_family_stats, head_family_stats, defines):
+    if "specializable" not in base_family_stats:
+        return
+
+    base_total = sum(base_family_stats.get(kind, 0) for kind in TOTAL)
+    head_total = sum(head_family_stats.get(kind, 0) for kind in TOTAL)
+    if base_total + head_total == 0:
+        return
+    with Section(name, 3, f"specialization stats for {name} family"):
+        base_rows = calculate_specialization_stats(base_family_stats, base_total)
+        head_rows = calculate_specialization_stats(head_family_stats, head_total)
+        emit_table(
+            ("Kind", "Base Count", "Base Ratio", "Head Count", "Head Ratio"),
+            join_rows(base_rows, head_rows)
+        )
+        base_rows = calculate_specialization_success_failure(base_family_stats)
+        head_rows = calculate_specialization_success_failure(head_family_stats)
+        rows = join_rows(base_rows, head_rows)
+        if rows:
+            print_title("Specialization attempts", 4)
+            emit_table(("", "Base Count:", "Base Ratio:", "Head Count:", "Head Ratio:"), rows)
+            base_rows = calculate_specialization_failure_kinds(name, base_family_stats, defines)
+            head_rows = calculate_specialization_failure_kinds(name, head_family_stats, defines)
+            emit_table(
+                ("Failure kind", "Base Count:", "Base Ratio:", "Head Count:", "Head Ratio:"),
+                join_rows(base_rows, head_rows)
+            )
+
+def gather_stats(input):
+    # Note the output of this function must be JSON-serializable
+
+    if os.path.isfile(input):
+        with open(input, "r") as fd:
+            return json.load(fd)
+    elif os.path.isdir(input):
+        stats = collections.Counter()
+        for filename in os.listdir(input):
+            with open(os.path.join(input, filename)) as fd:
+                for line in fd:
+                    try:
+                        key, value = line.split(":")
+                    except ValueError:
+                        print(f"Unparsable line: '{line.strip()}' in  {filename}", file=sys.stderr)
+                        continue
+                    key = key.strip()
+                    value = int(value)
+                    stats[key] += value
+            stats['__nfiles__'] += 1
+        return stats
+    else:
+        raise ValueError(f"{input:r} is not a file or directory path")
+
+def extract_opcode_stats(stats):
+    opcode_stats = [ {} for _ in range(256) ]
+    for key, value in stats.items():
+        if not key.startswith("opcode"):
+            continue
+        n, _, rest = key[7:].partition("]")
+        opcode_stats[int(n)][rest.strip(".")] = value
+    return opcode_stats
+
+def parse_kinds(spec_src, prefix="SPEC_FAIL"):
+    defines = collections.defaultdict(list)
+    start = "#define " + prefix + "_"
+    for line in spec_src:
+        line = line.strip()
+        if not line.startswith(start):
+            continue
+        line = line[len(start):]
+        name, val = line.split()
+        defines[int(val.strip())].append(name.strip())
+    return defines
+
+def pretty(defname):
+    return defname.replace("_", " ").lower()
+
+def kind_to_text(kind, defines, opname):
+    if kind <= 8:
+        return pretty(defines[kind][0])
+    if opname == "LOAD_SUPER_ATTR":
+        opname = "SUPER"
+    elif opname.endswith("ATTR"):
+        opname = "ATTR"
+    elif opname in ("FOR_ITER", "SEND"):
+        opname = "ITER"
+    elif opname.endswith("SUBSCR"):
+        opname = "SUBSCR"
+    for name in defines[kind]:
+        if name.startswith(opname):
+            return pretty(name[len(opname)+1:])
+    return "kind " + str(kind)
+
+def categorized_counts(opcode_stats):
+    basic = 0
+    specialized = 0
+    not_specialized = 0
+    specialized_instructions = {
+        op for op in opcode._specialized_instructions
+        if "__" not in op}
+    for i, opcode_stat in enumerate(opcode_stats):
+        if "execution_count" not in opcode_stat:
+            continue
+        count = opcode_stat['execution_count']
+        name = opname[i]
+        if "specializable" in opcode_stat:
+            not_specialized += count
+        elif name in specialized_instructions:
+            miss = opcode_stat.get("specialization.miss", 0)
+            not_specialized += miss
+            specialized += count - miss
+        else:
+            basic += count
+    return basic, not_specialized, specialized
+
+def print_title(name, level=2):
+    print("#"*level, name)
+    print()
+
+class Section:
+
+    def __init__(self, title, level=2, summary=None):
+        self.title = title
+        self.level = level
+        if summary is None:
+            self.summary = title.lower()
+        else:
+            self.summary = summary
+
+    def __enter__(self):
+        print_title(self.title, self.level)
+        print("<details>")
+        print("<summary>", self.summary, "</summary>")
+        print()
+        return self
+
+    def __exit__(*args):
+        print()
+        print("</details>")
+        print()
+
+def to_str(x):
+    if isinstance(x, int):
+        return format(x, ",d")
+    else:
+        return str(x)
+
+def emit_table(header, rows):
+    width = len(header)
+    header_line = "|"
+    under_line = "|"
+    for item in header:
+        under = "---"
+        if item.endswith(":"):
+            item = item[:-1]
+            under += ":"
+        header_line += item + " | "
+        under_line += under + "|"
+    print(header_line)
+    print(under_line)
+    for row in rows:
+        if width is not None and len(row) != width:
+            raise ValueError("Wrong number of elements in row '" + str(row) + "'")
+        print("|", " | ".join(to_str(i) for i in row), "|")
+    print()
+
+def calculate_execution_counts(opcode_stats, total):
+    counts = []
+    for i, opcode_stat in enumerate(opcode_stats):
+        if "execution_count" in opcode_stat:
+            count = opcode_stat['execution_count']
+            miss = 0
+            if "specializable" not in opcode_stat:
+                miss = opcode_stat.get("specialization.miss")
+            counts.append((count, opname[i], miss))
+    counts.sort(reverse=True)
+    cumulative = 0
+    rows = []
+    for (count, name, miss) in counts:
+        cumulative += count
+        if miss:
+            miss = format_ratio(miss, count)
+        else:
+            miss = ""
+        rows.append((name, count, format_ratio(count, total),
+                     format_ratio(cumulative, total), miss))
+    return rows
+
+def emit_execution_counts(opcode_stats, total):
+    with Section("Execution counts", summary="execution counts for all instructions"):
+        rows = calculate_execution_counts(opcode_stats, total)
+        emit_table(
+            ("Name", "Count:", "Self:", "Cumulative:", "Miss ratio:"),
+            rows
+        )
+
+def emit_comparative_execution_counts(
+    base_opcode_stats, base_total, head_opcode_stats, head_total
+):
+    with Section("Execution counts", summary="execution counts for all instructions"):
+        base_rows = calculate_execution_counts(base_opcode_stats, base_total)
+        head_rows = calculate_execution_counts(head_opcode_stats, head_total)
+        base_data = dict((x[0], x[1:]) for x in base_rows)
+        head_data = dict((x[0], x[1:]) for x in head_rows)
+        opcodes = set(base_data.keys()) | set(head_data.keys())
+
+        rows = []
+        default = [0, "0.0%", "0.0%", 0]
+        for opcode in opcodes:
+            base_entry = base_data.get(opcode, default)
+            head_entry = head_data.get(opcode, default)
+            if base_entry[0] == 0:
+                change = 1
+            else:
+                change = (head_entry[0] - base_entry[0]) / base_entry[0]
+            rows.append(
+                (opcode, base_entry[0], head_entry[0],
+                 f"{100*change:0.1f}%"))
+
+        rows.sort(key=lambda x: -abs(float(x[-1][:-1])))
+
+        emit_table(
+            ("Name", "Base Count:", "Head Count:", "Change:"),
+            rows
+        )
+
+def get_defines():
+    spec_path = os.path.join(os.path.dirname(__file__), "../../Python/specialize.c")
+    with open(spec_path) as spec_src:
+        defines = parse_kinds(spec_src)
+    return defines
+
+def emit_specialization_stats(opcode_stats):
+    defines = get_defines()
+    with Section("Specialization stats", summary="specialization stats by family"):
+        for i, opcode_stat in enumerate(opcode_stats):
+            name = opname[i]
+            print_specialization_stats(name, opcode_stat, defines)
+
+def emit_comparative_specialization_stats(base_opcode_stats, head_opcode_stats):
+    defines = get_defines()
+    with Section("Specialization stats", summary="specialization stats by family"):
+        for i, (base_opcode_stat, head_opcode_stat) in enumerate(zip(base_opcode_stats, head_opcode_stats)):
+            name = opname[i]
+            print_comparative_specialization_stats(name, base_opcode_stat, head_opcode_stat, defines)
+
+def calculate_specialization_effectiveness(opcode_stats, total):
+    basic, not_specialized, specialized = categorized_counts(opcode_stats)
+    return [
+        ("Basic", basic, format_ratio(basic, total)),
+        ("Not specialized", not_specialized, format_ratio(not_specialized, total)),
+        ("Specialized", specialized, format_ratio(specialized, total)),
+    ]
+
+def emit_specialization_overview(opcode_stats, total):
+    with Section("Specialization effectiveness"):
+        rows = calculate_specialization_effectiveness(opcode_stats, total)
+        emit_table(("Instructions", "Count:", "Ratio:"), rows)
+        for title, field in (("Deferred", "specialization.deferred"), ("Misses", "specialization.miss")):
+            total = 0
+            counts = []
+            for i, opcode_stat in enumerate(opcode_stats):
+                # Avoid double counting misses
+                if title == "Misses" and "specializable" in opcode_stat:
+                    continue
+                value = opcode_stat.get(field, 0)
+                counts.append((value, opname[i]))
+                total += value
+            counts.sort(reverse=True)
+            if total:
+                with Section(f"{title} by instruction", 3):
+                    rows = [ (name, count, format_ratio(count, total)) for (count, name) in counts[:10] ]
+                    emit_table(("Name", "Count:", "Ratio:"), rows)
+
+def emit_comparative_specialization_overview(base_opcode_stats, base_total, head_opcode_stats, head_total):
+    with Section("Specialization effectiveness"):
+        base_rows = calculate_specialization_effectiveness(base_opcode_stats, base_total)
+        head_rows = calculate_specialization_effectiveness(head_opcode_stats, head_total)
+        emit_table(
+            ("Instructions", "Base Count:", "Base Ratio:", "Head Count:", "Head Ratio:"),
+            join_rows(base_rows, head_rows)
+        )
+
+def get_stats_defines():
+    stats_path = os.path.join(os.path.dirname(__file__), "../../Include/pystats.h")
+    with open(stats_path) as stats_src:
+        defines = parse_kinds(stats_src, prefix="EVAL_CALL")
+    return defines
+
+def calculate_call_stats(stats):
+    defines = get_stats_defines()
+    total = 0
+    for key, value in stats.items():
+        if "Calls to" in key:
+            total += value
+            rows = []
+    for key, value in stats.items():
+        if "Calls to" in key:
+            rows.append((key, value, format_ratio(value, total)))
+        elif key.startswith("Calls "):
+            name, index = key[:-1].split("[")
+            index =  int(index)
+            label = name + " (" + pretty(defines[index][0]) + ")"
+            rows.append((label, value, format_ratio(value, total)))
+    for key, value in stats.items():
+        if key.startswith("Frame"):
+            rows.append((key, value, format_ratio(value, total)))
+    return rows
+
+def emit_call_stats(stats):
+    with Section("Call stats", summary="Inlined calls and frame stats"):
+        rows = calculate_call_stats(stats)
+        emit_table(("", "Count:", "Ratio:"), rows)
+
+def emit_comparative_call_stats(base_stats, head_stats):
+    with Section("Call stats", summary="Inlined calls and frame stats"):
+        base_rows = calculate_call_stats(base_stats)
+        head_rows = calculate_call_stats(head_stats)
+        rows = join_rows(base_rows, head_rows)
+        rows.sort(key=lambda x: -float(x[-1][:-1]))
+        emit_table(
+            ("", "Base Count:", "Base Ratio:", "Head Count:", "Head Ratio:"),
+            rows
+        )
+
+def calculate_object_stats(stats):
+    total_materializations = stats.get("Object new values")
+    total_allocations = stats.get("Object allocations") + stats.get("Object allocations from freelist")
+    total_increfs = stats.get("Object interpreter increfs") + stats.get("Object increfs")
+    total_decrefs = stats.get("Object interpreter decrefs") + stats.get("Object decrefs")
+    rows = []
+    for key, value in stats.items():
+        if key.startswith("Object"):
+            if "materialize" in key:
+                ratio = format_ratio(value, total_materializations)
+            elif "allocations" in key:
+                ratio = format_ratio(value, total_allocations)
+            elif "increfs"     in key:
+                ratio = format_ratio(value, total_increfs)
+            elif "decrefs"     in key:
+                ratio = format_ratio(value, total_decrefs)
+            else:
+                ratio = ""
+            label = key[6:].strip()
+            label = label[0].upper() + label[1:]
+            rows.append((label, value, ratio))
+    return rows
+
+def emit_object_stats(stats):
+    with Section("Object stats", summary="allocations, frees and dict materializatons"):
+        rows = calculate_object_stats(stats)
+        emit_table(("",  "Count:", "Ratio:"), rows)
+
+def emit_comparative_object_stats(base_stats, head_stats):
+    with Section("Object stats", summary="allocations, frees and dict materializatons"):
+        base_rows = calculate_object_stats(base_stats)
+        head_rows = calculate_object_stats(head_stats)
+        emit_table(("",  "Base Count:", "Base Ratio:", "Head Count:", "Head Ratio:"), join_rows(base_rows, head_rows))
+
+def get_total(opcode_stats):
+    total = 0
+    for opcode_stat in opcode_stats:
+        if "execution_count" in opcode_stat:
+            total += opcode_stat['execution_count']
+    return total
+
+def emit_pair_counts(opcode_stats, total):
+    pair_counts = []
+    for i, opcode_stat in enumerate(opcode_stats):
+        if i == 0:
+            continue
+        for key, value in opcode_stat.items():
+            if key.startswith("pair_count"):
+                x, _, _ = key[11:].partition("]")
+                if value:
+                    pair_counts.append((value, (i, int(x))))
+    with Section("Pair counts", summary="Pair counts for top 100 pairs"):
+        pair_counts.sort(reverse=True)
+        cumulative = 0
+        rows = []
+        for (count, pair) in itertools.islice(pair_counts, 100):
+            i, j = pair
+            cumulative += count
+            rows.append((opname[i] + " " + opname[j], count, format_ratio(count, total),
+                         format_ratio(cumulative, total)))
+        emit_table(("Pair", "Count:", "Self:", "Cumulative:"),
+            rows
+        )
+    with Section("Predecessor/Successor Pairs", summary="Top 5 predecessors and successors of each opcode"):
+        predecessors = collections.defaultdict(collections.Counter)
+        successors = collections.defaultdict(collections.Counter)
+        total_predecessors = collections.Counter()
+        total_successors = collections.Counter()
+        for count, (first, second) in pair_counts:
+            if count:
+                predecessors[second][first] = count
+                successors[first][second] = count
+                total_predecessors[second] += count
+                total_successors[first] += count
+        for name, i in opmap.items():
+            total1 = total_predecessors[i]
+            total2 = total_successors[i]
+            if total1 == 0 and total2 == 0:
+                continue
+            pred_rows = succ_rows = ()
+            if total1:
+                pred_rows = [(opname[pred], count, f"{count/total1:.1%}")
+                             for (pred, count) in predecessors[i].most_common(5)]
+            if total2:
+                succ_rows = [(opname[succ], count, f"{count/total2:.1%}")
+                             for (succ, count) in successors[i].most_common(5)]
+            with Section(name, 3, f"Successors and predecessors for {name}"):
+                emit_table(("Predecessors", "Count:", "Percentage:"),
+                    pred_rows
+                )
+                emit_table(("Successors", "Count:", "Percentage:"),
+                    succ_rows
+                )
+
+def output_single_stats(stats):
+    opcode_stats = extract_opcode_stats(stats)
+    total = get_total(opcode_stats)
+    emit_execution_counts(opcode_stats, total)
+    emit_pair_counts(opcode_stats, total)
+    emit_specialization_stats(opcode_stats)
+    emit_specialization_overview(opcode_stats, total)
+    emit_call_stats(stats)
+    emit_object_stats(stats)
+    with Section("Meta stats", summary="Meta statistics"):
+        emit_table(("", "Count:"), [('Number of data files', stats['__nfiles__'])])
+
+
+def output_comparative_stats(base_stats, head_stats):
+    base_opcode_stats = extract_opcode_stats(base_stats)
+    base_total = get_total(base_opcode_stats)
+
+    head_opcode_stats = extract_opcode_stats(head_stats)
+    head_total = get_total(head_opcode_stats)
+
+    emit_comparative_execution_counts(
+        base_opcode_stats, base_total, head_opcode_stats, head_total
+    )
+    emit_comparative_specialization_stats(
+        base_opcode_stats, head_opcode_stats
+    )
+    emit_comparative_specialization_overview(
+        base_opcode_stats, base_total, head_opcode_stats, head_total
+    )
+    emit_comparative_call_stats(base_stats, head_stats)
+    emit_comparative_object_stats(base_stats, head_stats)
+
+def output_stats(inputs, json_output=None):
+    if len(inputs) == 1:
+        stats = gather_stats(inputs[0])
+        if json_output is not None:
+            json.dump(stats, json_output)
+        output_single_stats(stats)
+    elif len(inputs) == 2:
+        if json_output is not None:
+            raise ValueError(
+                "Can not output to JSON when there are multiple inputs"
+            )
+
+        base_stats = gather_stats(inputs[0])
+        head_stats = gather_stats(inputs[1])
+        output_comparative_stats(base_stats, head_stats)
+
+    print("---")
+    print("Stats gathered on:", date.today())
+
+def main():
+    parser = argparse.ArgumentParser(description="Summarize pystats results")
+
+    parser.add_argument(
+        "inputs",
+        nargs="*",
+        type=str,
+        default=[DEFAULT_DIR],
+        help=f"""
+        Input source(s).
+        For each entry, if a .json file, the output provided by --json-output from a previous run;
+        if a directory, a directory containing raw pystats .txt files.
+        If one source is provided, its stats are printed.
+        If two sources are provided, comparative stats are printed.
+        Default is {DEFAULT_DIR}.
+        """
+    )
+
+    parser.add_argument(
+        "--json-output",
+        nargs="?",
+        type=argparse.FileType("w"),
+        help="Output complete raw results to the given JSON file."
+    )
+
+    args = parser.parse_args()
+
+    if len(args.inputs) > 2:
+        raise ValueError("0-2 arguments may be provided.")
+
+    output_stats(args.inputs, json_output=args.json_output)
+
+if __name__ == "__main__":
+    main()

.CondaPkg/env/Tools/scripts/var_access_benchmark.py

@@ -0,0 +1,297 @@
+'Show relative speeds of local, nonlocal, global, and built-in access.'
+
+# Please leave this code so that it runs under older versions of
+# Python 3 (no f-strings).  That will allow benchmarking for
+# cross-version comparisons.  To run the benchmark on Python 2,
+# comment-out the nonlocal reads and writes.
+
+from collections import deque, namedtuple
+
+trials = [None] * 500
+steps_per_trial = 25
+
+class A(object):
+    def m(self):
+        pass
+
+class B(object):
+    __slots__ = 'x'
+    def __init__(self, x):
+        self.x = x
+
+class C(object):
+    def __init__(self, x):
+        self.x = x
+
+def read_local(trials=trials):
+    v_local = 1
+    for t in trials:
+        v_local;    v_local;    v_local;    v_local;    v_local
+        v_local;    v_local;    v_local;    v_local;    v_local
+        v_local;    v_local;    v_local;    v_local;    v_local
+        v_local;    v_local;    v_local;    v_local;    v_local
+        v_local;    v_local;    v_local;    v_local;    v_local
+
+def make_nonlocal_reader():
+    v_nonlocal = 1
+    def inner(trials=trials):
+        for t in trials:
+            v_nonlocal; v_nonlocal; v_nonlocal; v_nonlocal; v_nonlocal
+            v_nonlocal; v_nonlocal; v_nonlocal; v_nonlocal; v_nonlocal
+            v_nonlocal; v_nonlocal; v_nonlocal; v_nonlocal; v_nonlocal
+            v_nonlocal; v_nonlocal; v_nonlocal; v_nonlocal; v_nonlocal
+            v_nonlocal; v_nonlocal; v_nonlocal; v_nonlocal; v_nonlocal
+    inner.__name__ = 'read_nonlocal'
+    return inner
+
+read_nonlocal = make_nonlocal_reader()
+
+v_global = 1
+def read_global(trials=trials):
+    for t in trials:
+        v_global; v_global; v_global; v_global; v_global
+        v_global; v_global; v_global; v_global; v_global
+        v_global; v_global; v_global; v_global; v_global
+        v_global; v_global; v_global; v_global; v_global
+        v_global; v_global; v_global; v_global; v_global
+
+def read_builtin(trials=trials):
+    for t in trials:
+        oct; oct; oct; oct; oct
+        oct; oct; oct; oct; oct
+        oct; oct; oct; oct; oct
+        oct; oct; oct; oct; oct
+        oct; oct; oct; oct; oct
+
+def read_classvar_from_class(trials=trials, A=A):
+    A.x = 1
+    for t in trials:
+        A.x;    A.x;    A.x;    A.x;    A.x
+        A.x;    A.x;    A.x;    A.x;    A.x
+        A.x;    A.x;    A.x;    A.x;    A.x
+        A.x;    A.x;    A.x;    A.x;    A.x
+        A.x;    A.x;    A.x;    A.x;    A.x
+
+def read_classvar_from_instance(trials=trials, A=A):
+    A.x = 1
+    a = A()
+    for t in trials:
+        a.x;    a.x;    a.x;    a.x;    a.x
+        a.x;    a.x;    a.x;    a.x;    a.x
+        a.x;    a.x;    a.x;    a.x;    a.x
+        a.x;    a.x;    a.x;    a.x;    a.x
+        a.x;    a.x;    a.x;    a.x;    a.x
+
+def read_instancevar(trials=trials, a=C(1)):
+    for t in trials:
+        a.x;    a.x;    a.x;    a.x;    a.x
+        a.x;    a.x;    a.x;    a.x;    a.x
+        a.x;    a.x;    a.x;    a.x;    a.x
+        a.x;    a.x;    a.x;    a.x;    a.x
+        a.x;    a.x;    a.x;    a.x;    a.x
+
+def read_instancevar_slots(trials=trials, a=B(1)):
+    for t in trials:
+        a.x;    a.x;    a.x;    a.x;    a.x
+        a.x;    a.x;    a.x;    a.x;    a.x
+        a.x;    a.x;    a.x;    a.x;    a.x
+        a.x;    a.x;    a.x;    a.x;    a.x
+        a.x;    a.x;    a.x;    a.x;    a.x
+
+def read_namedtuple(trials=trials, D=namedtuple('D', ['x'])):
+    a = D(1)
+    for t in trials:
+        a.x;    a.x;    a.x;    a.x;    a.x
+        a.x;    a.x;    a.x;    a.x;    a.x
+        a.x;    a.x;    a.x;    a.x;    a.x
+        a.x;    a.x;    a.x;    a.x;    a.x
+        a.x;    a.x;    a.x;    a.x;    a.x
+
+def read_boundmethod(trials=trials, a=A()):
+    for t in trials:
+        a.m;    a.m;    a.m;    a.m;    a.m
+        a.m;    a.m;    a.m;    a.m;    a.m
+        a.m;    a.m;    a.m;    a.m;    a.m
+        a.m;    a.m;    a.m;    a.m;    a.m
+        a.m;    a.m;    a.m;    a.m;    a.m
+
+def write_local(trials=trials):
+    v_local = 1
+    for t in trials:
+        v_local = 1; v_local = 1; v_local = 1; v_local = 1; v_local = 1
+        v_local = 1; v_local = 1; v_local = 1; v_local = 1; v_local = 1
+        v_local = 1; v_local = 1; v_local = 1; v_local = 1; v_local = 1
+        v_local = 1; v_local = 1; v_local = 1; v_local = 1; v_local = 1
+        v_local = 1; v_local = 1; v_local = 1; v_local = 1; v_local = 1
+
+def make_nonlocal_writer():
+    v_nonlocal = 1
+    def inner(trials=trials):
+        nonlocal v_nonlocal
+        for t in trials:
+            v_nonlocal = 1; v_nonlocal = 1; v_nonlocal = 1; v_nonlocal = 1; v_nonlocal = 1
+            v_nonlocal = 1; v_nonlocal = 1; v_nonlocal = 1; v_nonlocal = 1; v_nonlocal = 1
+            v_nonlocal = 1; v_nonlocal = 1; v_nonlocal = 1; v_nonlocal = 1; v_nonlocal = 1
+            v_nonlocal = 1; v_nonlocal = 1; v_nonlocal = 1; v_nonlocal = 1; v_nonlocal = 1
+            v_nonlocal = 1; v_nonlocal = 1; v_nonlocal = 1; v_nonlocal = 1; v_nonlocal = 1
+    inner.__name__ = 'write_nonlocal'
+    return inner
+
+write_nonlocal = make_nonlocal_writer()
+
+def write_global(trials=trials):
+    global v_global
+    for t in trials:
+        v_global = 1; v_global = 1; v_global = 1; v_global = 1; v_global = 1
+        v_global = 1; v_global = 1; v_global = 1; v_global = 1; v_global = 1
+        v_global = 1; v_global = 1; v_global = 1; v_global = 1; v_global = 1
+        v_global = 1; v_global = 1; v_global = 1; v_global = 1; v_global = 1
+        v_global = 1; v_global = 1; v_global = 1; v_global = 1; v_global = 1
+
+def write_classvar(trials=trials, A=A):
+    for t in trials:
+        A.x = 1;    A.x = 1;    A.x = 1;    A.x = 1;    A.x = 1
+        A.x = 1;    A.x = 1;    A.x = 1;    A.x = 1;    A.x = 1
+        A.x = 1;    A.x = 1;    A.x = 1;    A.x = 1;    A.x = 1
+        A.x = 1;    A.x = 1;    A.x = 1;    A.x = 1;    A.x = 1
+        A.x = 1;    A.x = 1;    A.x = 1;    A.x = 1;    A.x = 1
+
+def write_instancevar(trials=trials, a=C(1)):
+    for t in trials:
+        a.x = 1;    a.x = 1;    a.x = 1;    a.x = 1;    a.x = 1
+        a.x = 1;    a.x = 1;    a.x = 1;    a.x = 1;    a.x = 1
+        a.x = 1;    a.x = 1;    a.x = 1;    a.x = 1;    a.x = 1
+        a.x = 1;    a.x = 1;    a.x = 1;    a.x = 1;    a.x = 1
+        a.x = 1;    a.x = 1;    a.x = 1;    a.x = 1;    a.x = 1
+
+def write_instancevar_slots(trials=trials, a=B(1)):
+    for t in trials:
+        a.x = 1;    a.x = 1;    a.x = 1;    a.x = 1;    a.x = 1
+        a.x = 1;    a.x = 1;    a.x = 1;    a.x = 1;    a.x = 1
+        a.x = 1;    a.x = 1;    a.x = 1;    a.x = 1;    a.x = 1
+        a.x = 1;    a.x = 1;    a.x = 1;    a.x = 1;    a.x = 1
+        a.x = 1;    a.x = 1;    a.x = 1;    a.x = 1;    a.x = 1
+
+def read_list(trials=trials, a=[1]):
+    for t in trials:
+        a[0];   a[0];   a[0];   a[0];   a[0]
+        a[0];   a[0];   a[0];   a[0];   a[0]
+        a[0];   a[0];   a[0];   a[0];   a[0]
+        a[0];   a[0];   a[0];   a[0];   a[0]
+        a[0];   a[0];   a[0];   a[0];   a[0]
+
+def read_deque(trials=trials, a=deque([1])):
+    for t in trials:
+        a[0];   a[0];   a[0];   a[0];   a[0]
+        a[0];   a[0];   a[0];   a[0];   a[0]
+        a[0];   a[0];   a[0];   a[0];   a[0]
+        a[0];   a[0];   a[0];   a[0];   a[0]
+        a[0];   a[0];   a[0];   a[0];   a[0]
+
+def read_dict(trials=trials, a={0: 1}):
+    for t in trials:
+        a[0];   a[0];   a[0];   a[0];   a[0]
+        a[0];   a[0];   a[0];   a[0];   a[0]
+        a[0];   a[0];   a[0];   a[0];   a[0]
+        a[0];   a[0];   a[0];   a[0];   a[0]
+        a[0];   a[0];   a[0];   a[0];   a[0]
+
+def read_strdict(trials=trials, a={'key': 1}):
+    for t in trials:
+        a['key'];   a['key'];   a['key'];   a['key'];   a['key']
+        a['key'];   a['key'];   a['key'];   a['key'];   a['key']
+        a['key'];   a['key'];   a['key'];   a['key'];   a['key']
+        a['key'];   a['key'];   a['key'];   a['key'];   a['key']
+        a['key'];   a['key'];   a['key'];   a['key'];   a['key']
+
+def list_append_pop(trials=trials, a=[1]):
+    ap, pop = a.append, a.pop
+    for t in trials:
+        ap(1); pop(); ap(1); pop(); ap(1); pop(); ap(1); pop(); ap(1); pop()
+        ap(1); pop(); ap(1); pop(); ap(1); pop(); ap(1); pop(); ap(1); pop()
+        ap(1); pop(); ap(1); pop(); ap(1); pop(); ap(1); pop(); ap(1); pop()
+        ap(1); pop(); ap(1); pop(); ap(1); pop(); ap(1); pop(); ap(1); pop()
+        ap(1); pop(); ap(1); pop(); ap(1); pop(); ap(1); pop(); ap(1); pop()
+
+def deque_append_pop(trials=trials, a=deque([1])):
+    ap, pop = a.append, a.pop
+    for t in trials:
+        ap(1); pop(); ap(1); pop(); ap(1); pop(); ap(1); pop(); ap(1); pop()
+        ap(1); pop(); ap(1); pop(); ap(1); pop(); ap(1); pop(); ap(1); pop()
+        ap(1); pop(); ap(1); pop(); ap(1); pop(); ap(1); pop(); ap(1); pop()
+        ap(1); pop(); ap(1); pop(); ap(1); pop(); ap(1); pop(); ap(1); pop()
+        ap(1); pop(); ap(1); pop(); ap(1); pop(); ap(1); pop(); ap(1); pop()
+
+def deque_append_popleft(trials=trials, a=deque([1])):
+    ap, pop = a.append, a.popleft
+    for t in trials:
+        ap(1); pop(); ap(1); pop(); ap(1); pop(); ap(1); pop(); ap(1); pop();
+        ap(1); pop(); ap(1); pop(); ap(1); pop(); ap(1); pop(); ap(1); pop();
+        ap(1); pop(); ap(1); pop(); ap(1); pop(); ap(1); pop(); ap(1); pop();
+        ap(1); pop(); ap(1); pop(); ap(1); pop(); ap(1); pop(); ap(1); pop();
+        ap(1); pop(); ap(1); pop(); ap(1); pop(); ap(1); pop(); ap(1); pop();
+
+def write_list(trials=trials, a=[1]):
+    for t in trials:
+        a[0]=1; a[0]=1; a[0]=1; a[0]=1; a[0]=1
+        a[0]=1; a[0]=1; a[0]=1; a[0]=1; a[0]=1
+        a[0]=1; a[0]=1; a[0]=1; a[0]=1; a[0]=1
+        a[0]=1; a[0]=1; a[0]=1; a[0]=1; a[0]=1
+        a[0]=1; a[0]=1; a[0]=1; a[0]=1; a[0]=1
+
+def write_deque(trials=trials, a=deque([1])):
+    for t in trials:
+        a[0]=1; a[0]=1; a[0]=1; a[0]=1; a[0]=1
+        a[0]=1; a[0]=1; a[0]=1; a[0]=1; a[0]=1
+        a[0]=1; a[0]=1; a[0]=1; a[0]=1; a[0]=1
+        a[0]=1; a[0]=1; a[0]=1; a[0]=1; a[0]=1
+        a[0]=1; a[0]=1; a[0]=1; a[0]=1; a[0]=1
+
+def write_dict(trials=trials, a={0: 1}):
+    for t in trials:
+        a[0]=1; a[0]=1; a[0]=1; a[0]=1; a[0]=1
+        a[0]=1; a[0]=1; a[0]=1; a[0]=1; a[0]=1
+        a[0]=1; a[0]=1; a[0]=1; a[0]=1; a[0]=1
+        a[0]=1; a[0]=1; a[0]=1; a[0]=1; a[0]=1
+        a[0]=1; a[0]=1; a[0]=1; a[0]=1; a[0]=1
+
+def write_strdict(trials=trials, a={'key': 1}):
+    for t in trials:
+        a['key']=1; a['key']=1; a['key']=1; a['key']=1; a['key']=1
+        a['key']=1; a['key']=1; a['key']=1; a['key']=1; a['key']=1
+        a['key']=1; a['key']=1; a['key']=1; a['key']=1; a['key']=1
+        a['key']=1; a['key']=1; a['key']=1; a['key']=1; a['key']=1
+        a['key']=1; a['key']=1; a['key']=1; a['key']=1; a['key']=1
+
+def loop_overhead(trials=trials):
+    for t in trials:
+        pass
+
+
+if __name__=='__main__':
+
+    from timeit import Timer
+
+    for f in [
+            'Variable and attribute read access:',
+            read_local, read_nonlocal, read_global, read_builtin,
+            read_classvar_from_class, read_classvar_from_instance,
+            read_instancevar, read_instancevar_slots,
+            read_namedtuple, read_boundmethod,
+            '\nVariable and attribute write access:',
+            write_local, write_nonlocal, write_global,
+            write_classvar, write_instancevar, write_instancevar_slots,
+            '\nData structure read access:',
+            read_list, read_deque, read_dict, read_strdict,
+            '\nData structure write access:',
+            write_list, write_deque, write_dict, write_strdict,
+            '\nStack (or queue) operations:',
+            list_append_pop, deque_append_pop, deque_append_popleft,
+            '\nTiming loop overhead:',
+            loop_overhead]:
+        if isinstance(f, str):
+            print(f)
+            continue
+        timing = min(Timer(f).repeat(7, 1000))
+        timing *= 1000000 / (len(trials) * steps_per_trial)
+        print('{:6.1f} ns\t{}'.format(timing, f.__name__))