Issue #28195: Don't expect the fd leak message to be on a specific line number,
just make sure that the line is present in the output.

Initial patch by Peter Wirtz.

I forgot there two variations of os.stat() in Python 3.5.

Issue #28162: WindowsConsoleIO readall() fails if first line starts with Ctrl+Z
Issue #28163: WindowsConsoleIO fileno() passes wrong flags to _open_osfhandle
Issue #28164: _PyIO_get_console_type fails for various paths

Issue #28138: Windows ._pth file should allow import site

Patch by Eryk Sun.

Also update the classmethod and staticmethod doc strings and comments to
match the RST documentation.

regular expression now contains a (truncated) regex pattern.
Patch by Tim Graham.

Issue #25270: Prevent codecs.escape_encode() from raising SystemError when an empty bytestring is passed