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INFO: pip is looking at multiple versions of defusedxml to determine which version is compatible with other requirements. This could take a while.
INFO: pip is looking at multiple versions of python3-saml to determine which version is compatible with other requirements. This could take a while.
INFO: pip is looking at multiple versions of isort to determine which version is compatible with other requirements. This could take a while.
INFO: pip is looking at multiple versions of rstcheck to determine which version is compatible with other requirements. This could take a while.
INFO: pip is looking at multiple versions of flake8-colors to determine which version is compatible with other requirements. This could take a while.
INFO: pip is looking at multiple versions of flake8 to determine which version is compatible with other requirements. This could take a while.
INFO: pip is looking at multiple versions of <Python from Requires-Python> to determine which version is compatible with other requirements. This could take a while.
INFO: pip is looking at multiple versions of pylint to determine which version is compatible with other requirements. This could take a while.
ERROR: Cannot install -r requirements-lint.txt (line 2) and -r requirements-lint.txt (line 8) because these package versions have conflicting dependencies.

The conflict is caused by:
    flake8 3.9.0 depends on pycodestyle<2.8.0 and >=2.7.0
    autopep8 1.6.0 depends on pycodestyle>=2.8.0

To fix this you could try to:
1. loosen the range of package versions you've specified
2. remove package versions to allow pip attempt to solve the dependency conflict

ERROR: ResolutionImpossible: for help visit https://pip.pypa.io/en/latest/user_guide/#fixing-conflicting-dependencies