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GeezerVison is showing github.com — gh-134551: Add t-strings support to pprint by loic-simon · Pull Request #134577 · python/cpython

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@loic-simon

@loic-simon loic-simon commented May 23, 2025 •
edited by hugovk
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Handle formatting of Template and Interpolation types in pprint functions:

>>> from pprint import pp
>>> name = "World"
>>> pp(t"Hello {name}")
Template(strings=('Hello ', ''),
         interpolations=(Interpolation('World', 'name', None, ''),))""")

Very straightforward, using existing PrettyPrinter helper methods.

To avoid slowing import time, I did not import Template and Interpolation from string.templatelib, but instead copied their (very simple) definition:

cpython/Lib/string/templatelib.py

Lines 8 to 11 in 99a9ab1

t = t"{0}"
Template = type(t)
Interpolation = type(t.interpolations[0])
del t

  • Issue: Add support for Template type (t-strings) to pprint #134551

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@loic-simon
Add Template / Interpolation formatting to pprint
628dc27
@bedevere-app bedevere-app Bot mentioned this pull request May 23, 2025
Add support for Template type (t-strings) to pprint #134551
Closed
@bedevere-app bedevere-app Bot added the awaiting review label May 23, 2025
blurb-it Bot and others added 3 commits May 23, 2025 10:28
@blurb-it
📜🤖 Added by blurb_it.
f14f7ad
@loic-simon
Merge branch 'python:main' into add-templates-to-pprint
9655e28
@loic-simon
Exclude test_pprint from ruff formatting
9a7a523
@loic-simon
loic-simon requested review from AA-Turner, AlexWaygood and hugovk as code owners May 23, 2025 12:02
@loic-simon

loic-simon commented May 23, 2025 •
edited
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Not sure why test.test_tokenize.TestRoundtrip.test_random_files fails on test_pprint.py? If I replace t-strings by f-strings it pass, is it an issue with the test not handling t-strings? Or a real issue with tokenizer round-trippring and t-strings?

Edit: looks like a real problem, I have a MRE, opening an issue soon
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@loic-simon loic-simon mentioned this pull request May 23, 2025
untokenize() round-trip fails for t-strings (with only type + string) #134582
Closed
hugovk
hugovk reviewed May 23, 2025
View reviewed changes
Comment thread Lib/test/.ruff.toml Resolved

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@loic-simon @hugovk
Fix names sorting in Lib/test/.ruff.toml
93380b5 
Co-authored-by: Hugo van Kemenade <[email protected]>
@AlexWaygood
AlexWaygood removed their request for review June 16, 2025 22:36
hugovk added 4 commits March 24, 2026 21:27
@hugovk
Merge branch 'main' into add-templates-to-pprint
2f27d21
@hugovk
Merge remote-tracking branch 'upstream/main' into add-templates-to-pp…
12c9433 
…rint
@hugovk
Add t-string support to pprint with expand=True
507bf30
@hugovk
Add to What's New
a486838
@hugovk

hugovk commented Apr 13, 2026 •
edited
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I've updated this PR to fix the merge conflict, add support for the new expand=True from #136964, and add this to What's New.

>>> from pprint import pp
>>> name = "World"
>>> pp(t"Hello {name}")
Template(strings=('Hello ', ''),
         interpolations=(Interpolation('World', 'name', None, ''),))
>>> pp(t"Hello {name}", expand=True)
Template(
 strings=('Hello ', ''),
 interpolations=(Interpolation('World', 'name', None, ''),),
)
davepeck reacted with heart emoji loic-simon reacted with rocket emoji
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hugovk
hugovk approved these changes Apr 13, 2026
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@bedevere-app bedevere-app Bot added awaiting merge and removed awaiting review labels Apr 13, 2026
@hugovk
hugovk merged commit 74a4f8c into python:main Apr 14, 2026
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@bedevere-app bedevere-app Bot removed the awaiting merge label Apr 14, 2026
ljfp pushed a commit to ljfp/cpython that referenced this pull request Apr 25, 2026
@loic-simon @hugovk
@blurb-it @ljfp
pythongh-134551: Add t-strings support to pprint (python#134577)
e3bf7d2 
Co-authored-by: Hugo van Kemenade <[email protected]>
Co-authored-by: blurb-it[bot] <43283697+blurb-it[bot]@users.noreply.github.com>
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@hugovk hugovk hugovk approved these changes
@AA-Turner AA-Turner Awaiting requested review from AA-Turner AA-Turner is a code owner

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2 participants

@loic-simon @hugovk
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