pip donne une erreur de conflit lors de l'installation du package

Lors de l'exécution de $ pip install , j'obtiens une erreur ci-dessous, dans ce cas, j'installe PyJWT et j'ai également vérifié les autres packages à vérifier. Cela s'est produit après la mise à niveau de pip vers 19.0.2 à partir de 19.0.1.

Vérifiez les erreurs ci-dessous lors de l'exécution de pip install PyJWT, les exigences sont déjà satisfaites, mais j'obtiens toujours une erreur, veuillez suggérer comment la corriger.

XXX

pour réinstaller le pip.

$ pip install PyJWT

Tejeshs-MacBook-Air:selenium_testing tejeshagrawal$ pip install PyJWT
Requirement already satisfied: PyJWT in
/usr/local/lib/python3.7/site-packages (1.7.1) Error checking for
conflicts. Traceback (most recent call last):   File
"/Users/tejeshagrawal/Library/Python/3.7/lib/python/site-packages/pip/_vendor/pkg_resources/__init__.py",
line 2897, in _dep_map
    return self.__dep_map   File "/Users/tejeshagrawal/Library/Python/3.7/lib/python/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
"/Users/tejeshagrawal/Library/Python/3.7/lib/python/site-packages/pip/_vendor/pkg_resources/__init__.py",
line 2888, in _parsed_pkg_info
    return self._pkg_info   File "/Users/tejeshagrawal/Library/Python/3.7/lib/python/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
"/Users/tejeshagrawal/Library/Python/3.7/lib/python/site-packages/pip/_internal/commands/install.py",
line 503, in _warn_about_conflicts
    package_set, _dep_info = check_install_conflicts(to_install)   File
"/Users/tejeshagrawal/Library/Python/3.7/lib/python/site-packages/pip/_internal/operations/check.py",
line 108, in check_install_conflicts
    package_set, _ = create_package_set_from_installed()   File "/Users/tejeshagrawal/Library/Python/3.7/lib/python/site-packages/pip/_internal/operations/check.py",
line 47, in create_package_set_from_installed
    package_set[name] = PackageDetails(dist.version, dist.requires())   File
"/Users/tejeshagrawal/Library/Python/3.7/lib/python/site-packages/pip/_vendor/pkg_resources/__init__.py",
line 2635, in requires
    dm = self._dep_map   File "/Users/tejeshagrawal/Library/Python/3.7/lib/python/site-packages/pip/_vendor/pkg_resources/__init__.py",
line 2899, in _dep_map
    self.__dep_map = self._compute_dependencies()   File "/Users/tejeshagrawal/Library/Python/3.7/lib/python/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
"/Users/tejeshagrawal/Library/Python/3.7/lib/python/site-packages/pip/_vendor/pkg_resources/__init__.py",
line 2890, in _parsed_pkg_info
    metadata = self.get_metadata(self.PKG_INFO)   File "/Users/tejeshagrawal/Library/Python/3.7/lib/python/site-packages/pip/_vendor/pkg_resources/__init__.py",
line 1410, in get_metadata
    value = self._get(self._fn(self.egg_info, name))   File "/Users/tejeshagrawal/Library/Python/3.7/lib/python/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:
'/usr/local/lib/python3.7/site-packages/~ip-18.1.dist-info/METADATA'
Tejeshs-MacBook-Air:selenium_testing tejeshagrawal$ pip freeze >
require.txt Could not parse requirement: -ip Exception: Traceback
(most recent call last):   File
"/Users/tejeshagrawal/Library/Python/3.7/lib/python/site-packages/pip/_vendor/pkg_resources/__init__.py",
line 2584, in version
    return self._version   File "/Users/tejeshagrawal/Library/Python/3.7/lib/python/site-packages/pip/_vendor/pkg_resources/__init__.py",
line 2691, in __getattr__
    raise AttributeError(attr) AttributeError: _version

**During handling of the above exception, another exception occurred:**

Traceback (most recent call last):   File
"/Users/tejeshagrawal/Library/Python/3.7/lib/python/site-packages/pip/_internal/cli/base_command.py",
line 179, in main
    status = self.run(options, args)   File "/Users/tejeshagrawal/Library/Python/3.7/lib/python/site-packages/pip/_internal/commands/freeze.py",
line 93, in run
    for line in freeze(**freeze_kwargs):   File "/Users/tejeshagrawal/Library/Python/3.7/lib/python/site-packages/pip/_internal/operations/freeze.py",
line 62, in freeze
    req = FrozenRequirement.from_dist(dist)   File "/Users/tejeshagrawal/Library/Python/3.7/lib/python/site-packages/pip/_internal/operations/freeze.py",
line 239, in from_dist
    req = dist.as_requirement()   File "/Users/tejeshagrawal/Library/Python/3.7/lib/python/site-packages/pip/_vendor/pkg_resources/__init__.py",
line 2716, in as_requirement
    if isinstance(self.parsed_version, packaging.version.Version):   File
"/Users/tejeshagrawal/Library/Python/3.7/lib/python/site-packages/pip/_vendor/pkg_resources/__init__.py",
line 2551, in parsed_version
    self._parsed_version = parse_version(self.version)   File "/Users/tejeshagrawal/Library/Python/3.7/lib/python/site-packages/pip/_vendor/pkg_resources/__init__.py",
line 2589, in version
    raise ValueError(tmpl % self.PKG_INFO, self) ValueError: ("Missing 'Version:' header and/or METADATA file", Unknown [unknown version]
(/usr/local/lib/python3.7/site-packages))