Patch by Chris Jerdonek.

Patch by Chris Jerdonek.

Thanks to Chris Jerdonek

Daniel Ellis.

Patch by Serhiy Storchaka.

Closes #15620: check for presence of readline.clear_history(), which is apparently missing on some readline versions, before calling it in the test.

Patch by Ludwig Hähne.

Initial patch by Anton Barkovsky.

failure on OS X built with 10.4 ABI.

Patch by Chris Jerdonek.

__import__().

To help explain why the -1 default value is typically not seen, a note
about how import statements only use values of >= 0 is also noted.

Patch by Roger Serwy.

sys.stdout and sys.stderr are now using "\r\n" newline on Windows, as Python 2.

translate newlines on output.

Make TextIOWrapper's documentation clearer by copying the newline argument's description from open().

Patch by Philipp Hagemeister.

Analysis by Victor Stinner. Patch by Stefan Krah.

Patch by Roger Serwy.

the Apple-supplied Tck/Tk versions shipped with OS X 10.7 and 10.8.
They are not as buggy as the 10.6 version but can still easily crash.