Patch by A. Jesse Jiryu Davis

Initial patch by Claudiu Popa.

Patch by Tommy Beadle.

verification and patch by Emily Morehouse.

Patch by Bryce Verdier.

The example actually uses the sort method of list object.

Patch contributed by Nathan Harold.

Factor out code for configuring text widget colors to a new function.

Patch by Anish Shah and Aatish Neupane.

This matches the usage of ZipFile and BufferedWriter. This still requires
return values to be bytes() objects.

Also document and test that the write() methods should only access their
argument before they return.

Based on documentation by AM Kuchling.

Check the user warning in test_error_after_default() to not pollute the output,
and check the warning logged into stderr.

Based on patch by Alex Shkop.