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GeezerVison is showing github.com — Add colour to `pprint` output · Issue #145217 · python/cpython

Add colour to pprint output #145217

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Add colour to pprint output#145217
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stdlibStandard Library Python modules in the Lib/ directoryStandard Library Python modules in the Lib/ directorytype-featureA feature request or enhancementA feature request or enhancement

Description

@hugovk
hugovk
opened on Feb 25, 2026
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Feature or enhancement

Proposal:

We can use the existing syntax theme to add colour to the output of:

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

cpython/Lib/_colorize.py

Lines 312 to 323 in 9b22261

class Syntax(ThemeSection):
prompt: str = ANSIColors.BOLD_MAGENTA
keyword: str = ANSIColors.BOLD_BLUE
keyword_constant: str = ANSIColors.BOLD_BLUE
builtin: str = ANSIColors.CYAN
comment: str = ANSIColors.RED
string: str = ANSIColors.GREEN
number: str = ANSIColors.YELLOW
op: str = ANSIColors.RESET
definition: str = ANSIColors.BOLD
soft_keyword: str = ANSIColors.BOLD_BLUE
reset: str = ANSIColors.RESET

As usual, this will respect the environment variables to control colour and the output stream's capabilities.

Has this already been discussed elsewhere?

This is a minor feature, which does not need previous discussion elsewhere

Links to previous discussion of this feature:

No response

Linked PRs

  • gh-145217: Add colour to pprint output #145218
Reacted by Itamar Oren
Reacted by Bartosz Sławecki

Activity

  1. hugovk
    added
    type-featureA feature request or enhancementA feature request or enhancement
    stdlibStandard Library Python modules in the Lib/ directoryStandard Library Python modules in the Lib/ directory
    on Feb 25, 2026
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