Added an optional argument timespec to the datetime isoformat() method
to choose the precision of the time component.

Original patch by Alessandro Cucci.

Patch by Guo Ci Teo.

Patch by Guo Ci Teo.

Raise ValueError if algorithm is not MD5 or SHA.

Initial patch by Mathieu Dupuy.

Raise ValueError if algorithm is not MD5 or SHA.

Initial patch by Mathieu Dupuy.

Optimized copying and deepcopying bytearrays, NotImplemented, slices,
short lists, tuples, dicts, sets.

Output of func(*args) stored in the next line:

    item_help = join([func(*args) for func, args in self.items])

_Section.items only used by HelpFormatter._add_item() and it looks
like it doesn't have any side effects.

Patch by Yogesh Chaudhari.

Patch by Liang-Bo Wang.

Patch by Liang-Bo Wang.

Patch by Liang-Bo Wang.

other write methods.

Patch by Jakub Stasiak.

Issue #25888

Patch by Sebastien Bourdeauducq (issue #26338)

Patch by Frederick Wagner (issue #26347)

Patch by Chris Angelico (issue #26221)

Patch by Vladimir Rutsky.