Backported r54226 from p3yk: Move test_unittest, test_doctest and test_doctest2 higher up in the testing order.

 (backport from rev. 54222)

 (backport from rev. 54220)

 (backport from rev. 54202)

given a unicode argument and os.listdir() returns unicode filenames.
 (backport from rev. 54197)

 (backport from rev. 54195)

Patch for bug #1633621: if curses.resizeterm() or
curses.resize_term() is called, update _curses.LINES,
_curses.COLS, curses.LINES and curses.COLS.

of Py_ssize_t.
 (backport from rev. 54177)

 (backport from rev. 54175)

  (backport from rev. 54173)

and should return True or False otherwise.
 (backport from rev. 54171)

fractional times.  With unittest.
  (backport from rev. 54167 by Guido)

 (backport from rev. 54162)

  (backport from rev. 54160)

 (backport)

 (backport from rev. 54156)

 (backport from rev. 54154)

"extending and embedding" tutorial.
 (backport from rev. 54150)

sq_ass_slice instead of the sq_slice slot.
 (backport from rev. 54139)

 (backport from rev. 54114)

 (backport from rev. 54088)

 (backport from rev. 53935)

Don't use a fixed temporary name (gdbm).
Don't use our own temp name creation (dbm).

 (backport from rev. 53787)