using for loop to install conda package

.CondaPkg/env/Lib/test/support/import_helper.py

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+import contextlib
+import _imp
+import importlib
+import importlib.util
+import os
+import shutil
+import sys
+import unittest
+import warnings
+
+from .os_helper import unlink
+
+
+@contextlib.contextmanager
+def _ignore_deprecated_imports(ignore=True):
+    """Context manager to suppress package and module deprecation
+    warnings when importing them.
+
+    If ignore is False, this context manager has no effect.
+    """
+    if ignore:
+        with warnings.catch_warnings():
+            warnings.filterwarnings("ignore", ".+ (module|package)",
+                                    DeprecationWarning)
+            yield
+    else:
+        yield
+
+
+def unload(name):
+    try:
+        del sys.modules[name]
+    except KeyError:
+        pass
+
+
+def forget(modname):
+    """'Forget' a module was ever imported.
+
+    This removes the module from sys.modules and deletes any PEP 3147/488 or
+    legacy .pyc files.
+    """
+    unload(modname)
+    for dirname in sys.path:
+        source = os.path.join(dirname, modname + '.py')
+        # It doesn't matter if they exist or not, unlink all possible
+        # combinations of PEP 3147/488 and legacy pyc files.
+        unlink(source + 'c')
+        for opt in ('', 1, 2):
+            unlink(importlib.util.cache_from_source(source, optimization=opt))
+
+
+def make_legacy_pyc(source):
+    """Move a PEP 3147/488 pyc file to its legacy pyc location.
+
+    :param source: The file system path to the source file.  The source file
+        does not need to exist, however the PEP 3147/488 pyc file must exist.
+    :return: The file system path to the legacy pyc file.
+    """
+    pyc_file = importlib.util.cache_from_source(source)
+    up_one = os.path.dirname(os.path.abspath(source))
+    legacy_pyc = os.path.join(up_one, source + 'c')
+    shutil.move(pyc_file, legacy_pyc)
+    return legacy_pyc
+
+
+def import_module(name, deprecated=False, *, required_on=()):
+    """Import and return the module to be tested, raising SkipTest if
+    it is not available.
+
+    If deprecated is True, any module or package deprecation messages
+    will be suppressed. If a module is required on a platform but optional for
+    others, set required_on to an iterable of platform prefixes which will be
+    compared against sys.platform.
+    """
+    with _ignore_deprecated_imports(deprecated):
+        try:
+            return importlib.import_module(name)
+        except ImportError as msg:
+            if sys.platform.startswith(tuple(required_on)):
+                raise
+            raise unittest.SkipTest(str(msg))
+
+
+def _save_and_remove_modules(names):
+    orig_modules = {}
+    prefixes = tuple(name + '.' for name in names)
+    for modname in list(sys.modules):
+        if modname in names or modname.startswith(prefixes):
+            orig_modules[modname] = sys.modules.pop(modname)
+    return orig_modules
+
+
+@contextlib.contextmanager
+def frozen_modules(enabled=True):
+    """Force frozen modules to be used (or not).
+
+    This only applies to modules that haven't been imported yet.
+    Also, some essential modules will always be imported frozen.
+    """
+    _imp._override_frozen_modules_for_tests(1 if enabled else -1)
+    try:
+        yield
+    finally:
+        _imp._override_frozen_modules_for_tests(0)
+
+
+def import_fresh_module(name, fresh=(), blocked=(), *,
+                        deprecated=False,
+                        usefrozen=False,
+                        ):
+    """Import and return a module, deliberately bypassing sys.modules.
+
+    This function imports and returns a fresh copy of the named Python module
+    by removing the named module from sys.modules before doing the import.
+    Note that unlike reload, the original module is not affected by
+    this operation.
+
+    *fresh* is an iterable of additional module names that are also removed
+    from the sys.modules cache before doing the import. If one of these
+    modules can't be imported, None is returned.
+
+    *blocked* is an iterable of module names that are replaced with None
+    in the module cache during the import to ensure that attempts to import
+    them raise ImportError.
+
+    The named module and any modules named in the *fresh* and *blocked*
+    parameters are saved before starting the import and then reinserted into
+    sys.modules when the fresh import is complete.
+
+    Module and package deprecation messages are suppressed during this import
+    if *deprecated* is True.
+
+    This function will raise ImportError if the named module cannot be
+    imported.
+
+    If "usefrozen" is False (the default) then the frozen importer is
+    disabled (except for essential modules like importlib._bootstrap).
+    """
+    # NOTE: test_heapq, test_json and test_warnings include extra sanity checks
+    # to make sure that this utility function is working as expected
+    with _ignore_deprecated_imports(deprecated):
+        # Keep track of modules saved for later restoration as well
+        # as those which just need a blocking entry removed
+        fresh = list(fresh)
+        blocked = list(blocked)
+        names = {name, *fresh, *blocked}
+        orig_modules = _save_and_remove_modules(names)
+        for modname in blocked:
+            sys.modules[modname] = None
+
+        try:
+            with frozen_modules(usefrozen):
+                # Return None when one of the "fresh" modules can not be imported.
+                try:
+                    for modname in fresh:
+                        __import__(modname)
+                except ImportError:
+                    return None
+                return importlib.import_module(name)
+        finally:
+            _save_and_remove_modules(names)
+            sys.modules.update(orig_modules)
+
+
+class CleanImport(object):
+    """Context manager to force import to return a new module reference.
+
+    This is useful for testing module-level behaviours, such as
+    the emission of a DeprecationWarning on import.
+
+    Use like this:
+
+        with CleanImport("foo"):
+            importlib.import_module("foo") # new reference
+
+    If "usefrozen" is False (the default) then the frozen importer is
+    disabled (except for essential modules like importlib._bootstrap).
+    """
+
+    def __init__(self, *module_names, usefrozen=False):
+        self.original_modules = sys.modules.copy()
+        for module_name in module_names:
+            if module_name in sys.modules:
+                module = sys.modules[module_name]
+                # It is possible that module_name is just an alias for
+                # another module (e.g. stub for modules renamed in 3.x).
+                # In that case, we also need delete the real module to clear
+                # the import cache.
+                if module.__name__ != module_name:
+                    del sys.modules[module.__name__]
+                del sys.modules[module_name]
+        self._frozen_modules = frozen_modules(usefrozen)
+
+    def __enter__(self):
+        self._frozen_modules.__enter__()
+        return self
+
+    def __exit__(self, *ignore_exc):
+        sys.modules.update(self.original_modules)
+        self._frozen_modules.__exit__(*ignore_exc)
+
+
+class DirsOnSysPath(object):
+    """Context manager to temporarily add directories to sys.path.
+
+    This makes a copy of sys.path, appends any directories given
+    as positional arguments, then reverts sys.path to the copied
+    settings when the context ends.
+
+    Note that *all* sys.path modifications in the body of the
+    context manager, including replacement of the object,
+    will be reverted at the end of the block.
+    """
+
+    def __init__(self, *paths):
+        self.original_value = sys.path[:]
+        self.original_object = sys.path
+        sys.path.extend(paths)
+
+    def __enter__(self):
+        return self
+
+    def __exit__(self, *ignore_exc):
+        sys.path = self.original_object
+        sys.path[:] = self.original_value
+
+
+def modules_setup():
+    return sys.modules.copy(),
+
+
+def modules_cleanup(oldmodules):
+    # Encoders/decoders are registered permanently within the internal
+    # codec cache. If we destroy the corresponding modules their
+    # globals will be set to None which will trip up the cached functions.
+    encodings = [(k, v) for k, v in sys.modules.items()
+                 if k.startswith('encodings.')]
+    sys.modules.clear()
+    sys.modules.update(encodings)
+    # XXX: This kind of problem can affect more than just encodings.
+    # In particular extension modules (such as _ssl) don't cope
+    # with reloading properly. Really, test modules should be cleaning
+    # out the test specific modules they know they added (ala test_runpy)
+    # rather than relying on this function (as test_importhooks and test_pkg
+    # do currently). Implicitly imported *real* modules should be left alone
+    # (see issue 10556).
+    sys.modules.update(oldmodules)