pip error while installing pydicom

[akksa]

• pip version:
  pip 20.2.2 from /opt/anaconda3/lib/python3.7/site-packages/pip (python 3.7)

• Python version:
  Python 3.7

• Operating system:
  Mac OS Catalina 10.15.6

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 "/opt/anaconda3/lib/python3.7/site-packages/pip/_vendor/pkg_resources/init.py", line 3021, in _dep_map
return self.__dep_map
File "/opt/anaconda3/lib/python3.7/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 "/opt/anaconda3/lib/python3.7/site-packages/pip/_vendor/pkg_resources/init.py", line 3012, in _parsed_pkg_info
return self._pkg_info
File "/opt/anaconda3/lib/python3.7/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 "/opt/anaconda3/lib/python3.7/site-packages/pip/_internal/commands/install.py", line 535, in _determine_conflicts
return check_install_conflicts(to_install)
File "/opt/anaconda3/lib/python3.7/site-packages/pip/_internal/operations/check.py", line 108, in check_install_conflicts
package_set, _ = create_package_set_from_installed()
File "/opt/anaconda3/lib/python3.7/site-packages/pip/_internal/operations/check.py", line 50, in create_package_set_from_installed
package_set[name] = PackageDetails(dist.version, dist.requires())
File "/opt/anaconda3/lib/python3.7/site-packages/pip/_vendor/pkg_resources/init.py", line 2736, in requires
dm = self._dep_map
File "/opt/anaconda3/lib/python3.7/site-packages/pip/_vendor/pkg_resources/init.py", line 3023, in _dep_map
self.__dep_map = self._compute_dependencies()
File "/opt/anaconda3/lib/python3.7/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 "/opt/anaconda3/lib/python3.7/site-packages/pip/_vendor/pkg_resources/init.py", line 3014, in _parsed_pkg_info
metadata = self.get_metadata(self.PKG_INFO)
File "/opt/anaconda3/lib/python3.7/site-packages/pip/_vendor/pkg_resources/init.py", line 1420, in get_metadata
value = self._get(path)
File "/opt/anaconda3/lib/python3.7/site-packages/pip/_vendor/pkg_resources/init.py", line 1616, in _get
with open(path, 'rb') as stream:
FileNotFoundError: [Errno 2] No such file or directory: '/opt/anaconda3/lib/python3.7/site-packages/google_pasta-0.2.0.dist-info/METADATA'

[uranusjr]

#8676.