Experimental type system extensions for programs checked with the mypy typechecker.
copied from cf-staging / mypy_extensionsconda install conda-forge::mypy_extensions
conda install conda-forge/label/cf201901::mypy_extensions
conda install conda-forge/label/cf202003::mypy_extensions
The 'mypy_extensions' module defines experimental extensions to the standard 'typing' module that are supported by the mypy typechecker.