gh-145217: Add colour to pprint output

[hugovk]

Example:

import pprint

data = ["spam", "eggs", ("lumberjack", "knights"), "ni", 42, None]
data.insert(0, data)

pprint.pp(data)
pprint.pprint(data)
pprint.PrettyPrinter().pprint(data)

• Issue: Add colour to pprint output #145217

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📚 Documentation preview 📚: https://cpython-previews--145218.org.readthedocs.build/

[StanFromIreland]

Steve won't be happy: #145035

(We could move it, #142699)

[StanFromIreland]

Something is converting the newlines to ^Js:

>>> import pprint
... 
... data = ["spam", "eggs", ("lumberjack", "knights"), "ni", 42, None]
... data.insert(0, data)
... 
... pprint.pp(data)
... pprint.pprint(data)
... pprint.PrettyPrinter().pprint(data)
... 
[<Recursion on list with id=140532389171664>,^J 'spam',^J 'eggs',^J ('lumberjack', 'knights'),^J 'ni',^J 42,^J None]
[<Recursion on list with id=140532389171664>,^J 'spam',^J 'eggs',^J ('lumberjack', 'knights'),^J 'ni',^J 42,^J None]
[<Recursion on list with id=140532389171664>,^J 'spam',^J 'eggs',^J ('lumberjack', 'knights'),^J 'ni',^J 42,^J None]

[hugovk]

Looks like this is a change introduced by #146584 that just got merged in from main, pyrepl uses caret versions of control characters like ^J for \n.

Updated to pass a flag to avoid this escaping for pprint:

>>> import pprint
...
... data = ["spam", "eggs", ("lumberjack", "knights"), "ni", 42, None]
... data.insert(0, data)
...
... pprint.pp(data)
... pprint.pprint(data)
... pprint.PrettyPrinter().pprint(data)
...
[<Recursion on list with id=4395579856>,
 'spam',
 'eggs',
 ('lumberjack', 'knights'),
 'ni',
 42,
 None]
[<Recursion on list with id=4395579856>,
 'spam',
 'eggs',
 ('lumberjack', 'knights'),
 'ni',
 42,
 None]
[<Recursion on list with id=4395579856>,
 'spam',
 'eggs',
 ('lumberjack', 'knights'),