--- a/lib/python3.8/site-packages/pip/_internal/utils/virtualenv.py	Mon Jul 27 03:47:31 2020 -0400
+++ /dev/null	Thu Jan 01 00:00:00 1970 +0000
@@ -1,115 +0,0 @@
-from __future__ import absolute_import
-
-import logging
-import os
-import re
-import site
-import sys
-
-from pip._internal.utils.typing import MYPY_CHECK_RUNNING
-
-if MYPY_CHECK_RUNNING:
-    from typing import List, Optional
-
-logger = logging.getLogger(__name__)
-_INCLUDE_SYSTEM_SITE_PACKAGES_REGEX = re.compile(
-    r"include-system-site-packages\s*=\s*(?P<value>true|false)"
-)
-
-
-def _running_under_venv():
-    # type: () -> bool
-    """Checks if sys.base_prefix and sys.prefix match.
-
-    This handles PEP 405 compliant virtual environments.
-    """
-    return sys.prefix != getattr(sys, "base_prefix", sys.prefix)
-
-
-def _running_under_regular_virtualenv():
-    # type: () -> bool
-    """Checks if sys.real_prefix is set.
-
-    This handles virtual environments created with pypa's virtualenv.
-    """
-    # pypa/virtualenv case
-    return hasattr(sys, 'real_prefix')
-
-
-def running_under_virtualenv():
-    # type: () -> bool
-    """Return True if we're running inside a virtualenv, False otherwise.
-    """
-    return _running_under_venv() or _running_under_regular_virtualenv()
-
-
-def _get_pyvenv_cfg_lines():
-    # type: () -> Optional[List[str]]
-    """Reads {sys.prefix}/pyvenv.cfg and returns its contents as list of lines
-
-    Returns None, if it could not read/access the file.
-    """
-    pyvenv_cfg_file = os.path.join(sys.prefix, 'pyvenv.cfg')
-    try:
-        with open(pyvenv_cfg_file) as f:
-            return f.read().splitlines()  # avoids trailing newlines
-    except IOError:
-        return None
-
-
-def _no_global_under_venv():
-    # type: () -> bool
-    """Check `{sys.prefix}/pyvenv.cfg` for system site-packages inclusion
-
-    PEP 405 specifies that when system site-packages are not supposed to be
-    visible from a virtual environment, `pyvenv.cfg` must contain the following
-    line:
-
-        include-system-site-packages = false
-
-    Additionally, log a warning if accessing the file fails.
-    """
-    cfg_lines = _get_pyvenv_cfg_lines()
-    if cfg_lines is None:
-        # We're not in a "sane" venv, so assume there is no system
-        # site-packages access (since that's PEP 405's default state).
-        logger.warning(
-            "Could not access 'pyvenv.cfg' despite a virtual environment "
-            "being active. Assuming global site-packages is not accessible "
-            "in this environment."
-        )
-        return True
-
-    for line in cfg_lines:
-        match = _INCLUDE_SYSTEM_SITE_PACKAGES_REGEX.match(line)
-        if match is not None and match.group('value') == 'false':
-            return True
-    return False
-
-
-def _no_global_under_regular_virtualenv():
-    # type: () -> bool
-    """Check if "no-global-site-packages.txt" exists beside site.py
-
-    This mirrors logic in pypa/virtualenv for determining whether system
-    site-packages are visible in the virtual environment.
-    """
-    site_mod_dir = os.path.dirname(os.path.abspath(site.__file__))
-    no_global_site_packages_file = os.path.join(
-        site_mod_dir, 'no-global-site-packages.txt',
-    )
-    return os.path.exists(no_global_site_packages_file)
-
-
-def virtualenv_no_global():
-    # type: () -> bool
-    """Returns a boolean, whether running in venv with no system site-packages.
-    """
-
-    if _running_under_regular_virtualenv():
-        return _no_global_under_regular_virtualenv()
-
-    if _running_under_venv():
-        return _no_global_under_venv()
-
-    return False