pip's dependency resolver does not currently take into account all the packages that are installed. This behaviour is the source of the following dependency conflicts.

[MonJ0J]

I am trying to install Tensorflow with the command: pip install tensorflow-cpu
and getting the following error:
ERROR: pip's dependency resolver does not currently take into account all the packages that are installed. This behaviour is the source of the following dependency conflicts.
pytest-astropy 0.8.0 requires pytest-cov>=2.0, which is not installed.
pytest-astropy 0.8.0 requires pytest-filter-subpackage>=0.1, which is not installed.

This came before that:

Installing collected packages: tensorboard-plugin-wit, pyasn1, libclang, flatbuffers, typing-extensions, termcolor, tensorflow-io-gcs-filesystem, tensorflow-estimator, tensorboard-data-server, rsa, pyasn1-modules, protobuf, oauthlib, numpy, MarkupSafe, keras, grpcio, google-pasta, gast, cachetools, astunparse, absl-py, werkzeug, requests-oauthlib, opt-einsum, importlib-metadata, google-auth, markdown, google-auth-oauthlib, tensorboard, tensorflow
Attempting uninstall: numpy
Found existing installation: numpy 1.18.1
Uninstalling numpy-1.18.1:
Successfully uninstalled numpy-1.18.1
Attempting uninstall: MarkupSafe
Found existing installation: MarkupSafe 1.1.1
Uninstalling MarkupSafe-1.1.1:
Successfully uninstalled MarkupSafe-1.1.1
Attempting uninstall: werkzeug
Found existing installation: Werkzeug 1.0.0
Uninstalling Werkzeug-1.0.0:
Successfully uninstalled Werkzeug-1.0.0
Attempting uninstall: importlib-metadata
Found existing installation: importlib-metadata 1.5.0
Uninstalling importlib-metadata-1.5.0:
Successfully uninstalled importlib-metadata-1.5.0