Initial patch by Brandon Milam.

"cum" is not a valid argument.

Patch by Brandon Milam.

Ensure that the uninstall helper for Windows passes the proper
flags to pip to prevent it from checking PyPI if the pip that
we're currently attempting to uninstall is the latest verison.

does support IPv6 and IPv4; www.python.org currently does not.

PyObject_IsInstance(), PyObject_RichCompareBool() and _PyDict_Contains()
to check for and handle errors correctly.

Original patch by David Moore.

See also issue 24017.

fix a resource warning.