The default Python prompt of the interactive shell. Often seen for code
examples which can be executed interactively in the interpreter.
...
The default Python prompt of the interactive shell when entering code for
an indented code block or within a pair of matching left and right
delimiters (parentheses, square brackets or curly braces).
2to3
A tool that tries to convert Python 2.x code to Python 3.x code by
handling most of the incompatibilities which can be detected by parsing the
source and traversing the parse
