Issue #14814: Add first draft of PEP 3144 ipaddress module documentation (initial patch by Sandro Tosi)

Improve an internal ipaddress test, add a comment explaining why treating networks as containers of interfaces rather than addresses would prove confusing

Patch by Serhiy Storchaka.

Patch by Serhiy Storchaka.

2) _mpd_qpow_mpd(): Abort the loop for all specials, not only infinity.

3) _mpd_qpow_mpd(): Make the function more general and distinguish between
   zero clamping and folding down the exponent. The latter case is currently
   handled by setting context->clamp to 0 before calling the function.

4) _mpd_qpow_int(): Add one to the work precision in case of a negative
   exponent. This is to get the same relative error (0.1 * 10**-prec)
   for both positive and negative exponents. The previous relative
   error for negative exponents was (0.2 * 10**-prec).

   Both errors are _before_ the final rounding to the context precision.

And don't use assert() anymore if check_maxchar is set: return -1 on error
instead.

Py_UCS4 buffer

or datetime objects.

module name into consideration when determining whether a module is a
package or not. This prevents importing a module's __init__ module
directly and having it considered a package, which can lead to
duplicate sub-modules.

Thanks to Ronan Lamy for reporting the bug.

that they are deprecated (previous commit documented this fact in the
module docs).