https://github.com/python/cpython/commit/ee0e22c088ce5483d4bacd5457d4feb5886bb58a
commit: ee0e22c088ce5483d4bacd5457d4feb5886bb58a
branch: main
author: Brandt Bucher <[email protected]>
committer: brandtbucher <[email protected]>
date: 2025-06-24T14:41:41-07:00
summary:
GH-90117: Check for list and tuple before MappingView in pprint (GH-135779)
files:
A Misc/NEWS.d/next/Library/2025-06-20-17-06-59.gh-issue-90117.GYWVrn.rst
M Lib/pprint.py
diff --git a/Lib/pprint.py b/Lib/pprint.py
index 1e611481b51ac0..92a2c543ac279c 100644
--- a/Lib/pprint.py
+++ b/Lib/pprint.py
@@ -653,6 +653,40 @@ def _safe_repr(self, object, context, maxlevels, level):
del context[objid]
return "{%s}" % ", ".join(components), readable, recursive
+ if (issubclass(typ, list) and r is list.__repr__) or \
+ (issubclass(typ, tuple) and r is tuple.__repr__):
+ if issubclass(typ, list):
+ if not object:
+ return "[]", True, False
+ format = "[%s]"
+ elif len(object) == 1:
+ format = "(%s,)"
+ else:
+ if not object:
+ return "()", True, False
+ format = "(%s)"
+ objid = id(object)
+ if maxlevels and level >= maxlevels:
+ return format % "...", False, objid in context
+ if objid in context:
+ return _recursion(object), False, True
+ context[objid] = 1
+ readable = True
+ recursive = False
+ components = []
+ append = components.append
+ level += 1
+ for o in object:
+ orepr, oreadable, orecur = self.format(
+ o, context, maxlevels, level)
+ append(orepr)
+ if not oreadable:
+ readable = False
+ if orecur:
+ recursive = True
+ del context[objid]
+ return format % ", ".join(components), readable, recursive
+
if issubclass(typ, _collections.abc.MappingView) and r in
self._view_reprs:
objid = id(object)
if maxlevels and level >= maxlevels:
@@ -689,40 +723,6 @@ def _safe_repr(self, object, context, maxlevels, level):
del context[objid]
return typ.__name__ + '([%s])' % ", ".join(components), readable,
recursive
- if (issubclass(typ, list) and r is list.__repr__) or \
- (issubclass(typ, tuple) and r is tuple.__repr__):
- if issubclass(typ, list):
- if not object:
- return "[]", True, False
- format = "[%s]"
- elif len(object) == 1:
- format = "(%s,)"
- else:
- if not object:
- return "()", True, False
- format = "(%s)"
- objid = id(object)
- if maxlevels and level >= maxlevels:
- return format % "...", False, objid in context
- if objid in context:
- return _recursion(object), False, True
- context[objid] = 1
- readable = True
- recursive = False
- components = []
- append = components.append
- level += 1
- for o in object:
- orepr, oreadable, orecur = self.format(
- o, context, maxlevels, level)
- append(orepr)
- if not oreadable:
- readable = False
- if orecur:
- recursive = True
- del context[objid]
- return format % ", ".join(components), readable, recursive
-
rep = repr(object)
return rep, (rep and not rep.startswith('<')), False
diff --git
a/Misc/NEWS.d/next/Library/2025-06-20-17-06-59.gh-issue-90117.GYWVrn.rst
b/Misc/NEWS.d/next/Library/2025-06-20-17-06-59.gh-issue-90117.GYWVrn.rst
new file mode 100644
index 00000000000000..2bb15cb6d9c61c
--- /dev/null
+++ b/Misc/NEWS.d/next/Library/2025-06-20-17-06-59.gh-issue-90117.GYWVrn.rst
@@ -0,0 +1 @@
+Speed up :mod:`pprint` for :class:`list` and :class:`tuple`.
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