Fix issue16932: Fix the urlparse example. Remote :port when scheme is not specified to demonstrate correct behavior

Add test for fragment producing with XMLGenerator.

This fixes an apparent copy-and-paste error.

Original patch by Manuel Jacob.

Patch by Lowe Thiderman

#15438: add a note to math.pow() that suggests using **/pow() for integers.  Patch by Mark Dickinson.

with 1, as in other lines.

  tkinter when the -E flag is passed to Python.  Patch by Zachary Ware.

Patch by Alexander Belopolsky.

a unicode argument contains non-BMP character.