'METADATA' crash during 'pip install'

• pip version:20.2
• Python version:3.8.4
• Operating system:windows 10

C:\Users\elcot>pip install scipy
Requirement already satisfied: scipy in c:\users\elcot\appdata\local\programs\python\python38\lib\site-packages (1.4.1)
Requirement already satisfied: numpy>=1.13.3 in c:\users\elcot\appdata\roaming\python\python38\site-packages (from scipy) (1.19.0)
ERROR: Error while checking for conflicts. Please file an issue on pip's issue tracker: https://github.com/pypa/pip/issues/new
Traceback (most recent call last):
  File "c:\users\elcot\appdata\local\programs\python\python38\lib\site-packages\pip\_vendor\pkg_resources\__init__.py", line 3021, in _dep_map
    return self.__dep_map
  File "c:\users\elcot\appdata\local\programs\python\python38\lib\site-packages\pip\_vendor\pkg_resources\__init__.py", line 2815, in __getattr__
    raise AttributeError(attr)
AttributeError: _DistInfoDistribution__dep_map

During handling of the above exception, another exception occurred:

Traceback (most recent call last):
  File "c:\users\elcot\appdata\local\programs\python\python38\lib\site-packages\pip\_vendor\pkg_resources\__init__.py", line 3012, in _parsed_pkg_info
    return self._pkg_info
  File "c:\users\elcot\appdata\local\programs\python\python38\lib\site-packages\pip\_vendor\pkg_resources\__init__.py", line 2815, in __getattr__
    raise AttributeError(attr)
AttributeError: _pkg_info

During handling of the above exception, another exception occurred:

Traceback (most recent call last):
  File "c:\users\elcot\appdata\local\programs\python\python38\lib\site-packages\pip\_internal\commands\install.py", line 535, in _determine_conflicts
    return check_install_conflicts(to_install)
  File "c:\users\elcot\appdata\local\programs\python\python38\lib\site-packages\pip\_internal\operations\check.py", line 108, in check_install_conflicts
    package_set, _ = create_package_set_from_installed()
  File "c:\users\elcot\appdata\local\programs\python\python38\lib\site-packages\pip\_internal\operations\check.py", line 50, in create_package_set_from_installed
    package_set[name] = PackageDetails(dist.version, dist.requires())
  File "c:\users\elcot\appdata\local\programs\python\python38\lib\site-packages\pip\_vendor\pkg_resources\__init__.py", line 2736, in requires
    dm = self._dep_map
  File "c:\users\elcot\appdata\local\programs\python\python38\lib\site-packages\pip\_vendor\pkg_resources\__init__.py", line 3023, in _dep_map
    self.__dep_map = self._compute_dependencies()
  File "c:\users\elcot\appdata\local\programs\python\python38\lib\site-packages\pip\_vendor\pkg_resources\__init__.py", line 3032, in _compute_dependencies
    for req in self._parsed_pkg_info.get_all('Requires-Dist') or []:
  File "c:\users\elcot\appdata\local\programs\python\python38\lib\site-packages\pip\_vendor\pkg_resources\__init__.py", line 3014, in _parsed_pkg_info
    metadata = self.get_metadata(self.PKG_INFO)
  File "c:\users\elcot\appdata\local\programs\python\python38\lib\site-packages\pip\_vendor\pkg_resources\__init__.py", line 1420, in get_metadata
    value = self._get(path)
  File "c:\users\elcot\appdata\local\programs\python\python38\lib\site-packages\pip\_vendor\pkg_resources\__init__.py", line 1616, in _get
    with open(path, 'rb') as stream:
PermissionError: [Errno 13] Permission denied: 'c:\\users\\elcot\\appdata\\roaming\\python\\python38\\site-packages\\astroid-2.4.2.dist-info\\METADATA'

[uranusjr]

Here’s some context for people landing in this issue. The error is generated during the “integrity check” phase after packages are installed, and the fact that you hit this indicates that the packages you want have all been correctly installed. You can safely ignore this message if you must.

The easiest way to work around the error is to delete the offending .dist-info directory in your environment. The last line of the error message should contain something like

FileNotFoundError: No such file or directory: /some/path/to/package-version.dist-info/METADATA

Steps to recover:

• Delete the displayed package-version.dist-info directory
• pip install --force-reinstall package==version

Update: The most likely cause to this issue is you installed the offending package with pip, but than uninstalled it with conda. This has been reported in conda/conda#10357; please drop a word there to let Conda maintainers know this is an issue.

[pradyunsg]

This is released as part of pip 20.2.4 now. Upgrading to the newest pip will include the fix.