Install Package using the below command

    pip install --trusted-host pypi.org --trusted-host files.pythonhosted.org <package_name>

    Permanent Fix

    Since the release of pip 10.0, you should be able to fix this permanently just by upgrading pip itself:

    $ pip install --trusted-host pypi.org --trusted-host files.pythonhosted.org pip setuptools

    References: Stack Over Flow

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