- refers to release PEP for lifecycle information
- refers to Python Package Index for migration tools
- covers enhancements added in maintenance releases

Closes issue #21569

Subclass TextViewer to add mock methods instead of monkey-patching it.

Patch contributed by Auke Willem Oosterhoff.

This changeset also includes cleanup allowed by this behavior change.

bbox(), curselection() and get().

Based on patch by Guilherme Polo.

non-ascii bytes literals.

2.7 and 3.4. Original patch by Saimadhav Heblikar.

Backport by Alex Gaynor.

the Tkinter module on 64-bit platforms.

directory that are too short to be parsed instead of letting a struct.unpack
error bubble up as this "bad data" appears in many real world zip files in the
wild and is ignored by other zip tools.

Put instructions in a fixed size scrollable Text. Patch by Saimadhav Heblikar.