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Use pprint.pformat(expand=True) on Python 3.15+ for better nested reprs #14966

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Use pprint.pformat(expand=True) on Python 3.15+ for better nested reprs #14966

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4 changes: 4 additions & 0 deletions src/_pytest/_io/saferepr.py
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Original file line number Diff line number Diff line change
Expand Up @@ -3,6 +3,7 @@
from itertools import islice
import pprint
import reprlib
import sys


def _try_repr_or_str(obj: object) -> str:
Expand Down Expand Up @@ -112,6 +113,9 @@ def safeformat(obj: object) -> str:
with a short exception info.
"""
try:
# Python 3.15+ supports expand=True for better nested reprs
if sys.version_info >= (3, 15):
return pprint.pformat(obj, expand=True)
return pprint.pformat(obj)
except Exception as exc:
return _format_repr_exception(exc, obj)
Expand Down