How to fix locking failed in pipenv?

Try to remove Pipefile.lock before installing a package

Here are my debugging notes. Still not sure which package is causing the problem, but this does seem to fix it.

The error you get when you first run pipenv install with pipenv version 2020.8.13.

Traceback (most recent call last):
  File "/usr/local/bin/pipenv", line 8, in <module>
    sys.exit(cli())
  File "/usr/local/lib/python3.6/site-packages/pipenv/vendor/click/core.py", line 829, in __call__
    return self.main(*args, **kwargs)
  File "/usr/local/lib/python3.6/site-packages/pipenv/vendor/click/core.py", line 782, in main
    rv = self.invoke(ctx)
  File "/usr/local/lib/python3.6/site-packages/pipenv/vendor/click/core.py", line 1259, in invoke
    return _process_result(sub_ctx.command.invoke(sub_ctx))
  File "/usr/local/lib/python3.6/site-packages/pipenv/vendor/click/core.py", line 1066, in invoke
    return ctx.invoke(self.callback, **ctx.params)
  File "/usr/local/lib/python3.6/site-packages/pipenv/vendor/click/core.py", line 610, in invoke
    return callback(*args, **kwargs)
  File "/usr/local/lib/python3.6/site-packages/pipenv/vendor/click/decorators.py", line 73, in new_func
    return ctx.invoke(f, obj, *args, **kwargs)
  File "/usr/local/lib/python3.6/site-packages/pipenv/vendor/click/core.py", line 610, in invoke
    return callback(*args, **kwargs)
  File "/usr/local/lib/python3.6/site-packages/pipenv/vendor/click/decorators.py", line 21, in new_func
    return f(get_current_context(), *args, **kwargs)
  File "/usr/local/lib/python3.6/site-packages/pipenv/cli/command.py", line 252, in install
    site_packages=state.site_packages
  File "/usr/local/lib/python3.6/site-packages/pipenv/core.py", line 1928, in do_install
    site_packages=site_packages,
  File "/usr/local/lib/python3.6/site-packages/pipenv/core.py", line 580, in ensure_project
    pypi_mirror=pypi_mirror,
  File "/usr/local/lib/python3.6/site-packages/pipenv/core.py", line 512, in ensure_virtualenv
    python=python, site_packages=site_packages, pypi_mirror=pypi_mirror
  File "/usr/local/lib/python3.6/site-packages/pipenv/core.py", line 999, in do_create_virtualenv
    project._environment.add_dist("pipenv")
  File "/usr/local/lib/python3.6/site-packages/pipenv/environment.py", line 135, in add_dist
    self.extend_dists(dist)
  File "/usr/local/lib/python3.6/site-packages/pipenv/environment.py", line 127, in extend_dists
    extras = self.resolve_dist(dist, self.base_working_set)
  File "/usr/local/lib/python3.6/site-packages/pipenv/environment.py", line 122, in resolve_dist
    deps |= cls.resolve_dist(dist, working_set)
  File "/usr/local/lib/python3.6/site-packages/pipenv/environment.py", line 121, in resolve_dist
    dist = working_set.find(req)
  File "/usr/local/lib/python3.6/site-packages/pkg_resources/__init__.py", line 642, in find
    raise VersionConflict(dist, req)
pkg_resources.VersionConflict: (importlib-metadata 2.0.0 (/usr/local/lib/python3.6/site-packages), Requirement.parse('importlib-metadata<2,>=0.12; python_version < "3.8"'))

If you run pip install -U pipenv it seems to change the importlib-metadata version:

Installing collected packages: importlib-metadata
  Attempting uninstall: importlib-metadata
    Found existing installation: importlib-metadata 2.0.0
    Uninstalling importlib-metadata-2.0.0:
      Successfully uninstalled importlib-metadata-2.0.0
Successfully installed importlib-metadata-1.7.0

Now if you run pipenv install -d --skip-lock it will finish. It seems like a library is requiring a version >= importlib-metadata 2.0.

When I pinned the following dependencies it didn't work at first when running pipenv lock, however, if I removed the lock file (rm Pipenv.lock) then it worked when I ran pipenv lock again.

virtualenv = "==20.0.31"
importlib-metadata = "==1.7.0"

How to fix locking failed in pipenv?

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