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"PackageNotFoundError: umap-learn" with importlib_metadata version 0.6. Update requirements to importlib_metadata>=0.7

See original GitHub issue

Hey! I just updated to latest master branch and I can no longer load scanpy.

import scanpy as sc gives me the error:

PackageNotFoundError                      Traceback (most recent call last)
<ipython-input-1-0074c9bc0b31> in <module>
----> 1 import scanpy as sc

~/new_scanpy/scanpy/scanpy/__init__.py in <module>
     25 __version__ = get_versions()['version']
     26 
---> 27 check_versions()
     28 del get_versions, check_versions
     29 

~/new_scanpy/scanpy/scanpy/utils.py in check_versions()
     38 
     39     anndata_version = version("anndata")
---> 40     umap_version = version("umap-learn")
     41 
     42     if anndata_version < LooseVersion('0.6.10'):

~/anaconda3/envs/sc-tutorial/lib/python3.6/site-packages/importlib_metadata/api.py in version(package)
    103         "Version" metadata key.
    104     """
--> 105     return distribution(package).version
    106 
    107 

~/anaconda3/envs/sc-tutorial/lib/python3.6/site-packages/importlib_metadata/api.py in distribution(package)
     84     :return: A ``Distribution`` instance (or subclass thereof).
     85     """
---> 86     return Distribution.from_name(package)
     87 
     88 

~/anaconda3/envs/sc-tutorial/lib/python3.6/site-packages/importlib_metadata/api.py in from_name(cls, name)
     50                 return resolved
     51         else:
---> 52             raise PackageNotFoundError(name)
     53 
     54     @staticmethod

PackageNotFoundError: umap-learn

I have umap-learn 0.3.9 installed.

Scanpy version: 1.4.3+115.g1aecabf Anndata version: 0.6.22rc1

It seems to work with umap-learn 0.3.8, scanpy 1.4.3+105.gc748b35. and anndata 0.6.22.post1+1.g8dcc3cd