pip install fail on Windows 10 because of the ill handling of the path str.

Environment

• pip version: 19.0.3 19.0.1 (python 3.7)
• Python version: Python 3.7.3 from python.org
• OS: Windows10 Home 10.0.171314 build 17134

Description Any pip install fail with the “FileNotFoundError: [Errno 2] No such file or directory: ‘c:\users\path\to\python37\site-packages\pip-19.0.1.dist-info\{METADATA,RECORD}’”

I feel strange the base name of the path is in uppercase while the other part of the path is in lower case (exactly mistakes).

Expected behavior Do not convert the dirname part to lower case and success to install.

How to Reproduce

1. Clean install Python 3.7.3 by using the executable install package on www.python.org
2. run pip install --upgrade pip in the command prompt.

Output exampled

Kazuy is my user name at the machine.

C:\Users\Kazuy>pip install --upgrade pip
Collecting pip
  Using cached https://files.pythonhosted.org/packages/d8/f3/413bab4ff08e1fc4828dfc59996d721917df8e8583ea85385d51125dceff/pip-19.0.3-py2.py3-none-any.whl
Error checking for conflicts.
Traceback (most recent call last):
  File "c:\users\kazuy\appdata\local\programs\python\python37\lib\site-packages\pip\_vendor\pkg_resources\__init__.py", line 2897, in _dep_map
    return self.__dep_map
  File "c:\users\kazuy\appdata\local\programs\python\python37\lib\site-packages\pip\_vendor\pkg_resources\__init__.py", line 2691, 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\kazuy\appdata\local\programs\python\python37\lib\site-packages\pip\_vendor\pkg_resources\__init__.py", line 2888, in _parsed_pkg_info
    return self._pkg_info
  File "c:\users\kazuy\appdata\local\programs\python\python37\lib\site-packages\pip\_vendor\pkg_resources\__init__.py", line 2691, 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\kazuy\appdata\local\programs\python\python37\lib\site-packages\pip\_internal\commands\install.py", line 503, in _warn_about_conflicts
    package_set, _dep_info = check_install_conflicts(to_install)
  File "c:\users\kazuy\appdata\local\programs\python\python37\lib\site-packages\pip\_internal\operations\check.py", line 108, in check_install_conflicts
    package_set, _ = create_package_set_from_installed()
  File "c:\users\kazuy\appdata\local\programs\python\python37\lib\site-packages\pip\_internal\operations\check.py", line 47, in create_package_set_from_installed
    package_set[name] = PackageDetails(dist.version, dist.requires())
  File "c:\users\kazuy\appdata\local\programs\python\python37\lib\site-packages\pip\_vendor\pkg_resources\__init__.py", line 2635, in requires
    dm = self._dep_map
  File "c:\users\kazuy\appdata\local\programs\python\python37\lib\site-packages\pip\_vendor\pkg_resources\__init__.py", line 2899, in _dep_map
    self.__dep_map = self._compute_dependencies()
  File "c:\users\kazuy\appdata\local\programs\python\python37\lib\site-packages\pip\_vendor\pkg_resources\__init__.py", line 2908, in _compute_dependencies
    for req in self._parsed_pkg_info.get_all('Requires-Dist') or []:
  File "c:\users\kazuy\appdata\local\programs\python\python37\lib\site-packages\pip\_vendor\pkg_resources\__init__.py", line 2890, in _parsed_pkg_info
    metadata = self.get_metadata(self.PKG_INFO)
  File "c:\users\kazuy\appdata\local\programs\python\python37\lib\site-packages\pip\_vendor\pkg_resources\__init__.py", line 1410, in get_metadata
    value = self._get(self._fn(self.egg_info, name))
  File "c:\users\kazuy\appdata\local\programs\python\python37\lib\site-packages\pip\_vendor\pkg_resources\__init__.py", line 1522, in _get
    with open(path, 'rb') as stream:
FileNotFoundError: [Errno 2] No such file or directory: 'c:\\users\\kazuy\\appdata\\roaming\\python\\python37\\site-packages\\pip-19.0.1.dist-info\\METADATA'
Installing collected packages: pip
  Found existing installation: pip 19.0.1
Could not install packages due to an EnvironmentError: [Errno 2] No such file or directory: 'c:\\users\\kazuy\\appdata\\roaming\\python\\python37\\site-packages\\pip-19.0.1.dist-info\\RECORD'

[ghost]

It seems that I used old pip for some reason. I have no problem with the latest Python/pip set.

Thank you for Spending your precious time.

[lock[bot]]

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