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gh-151596: Added missing argument 'size' with default value of -1 to TextIOBase.readline #151679

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gh-151596: Added missing argument 'size' with default value of -1 to TextIOBase.readline #151679

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6663af7
Added missing argument 'size' with default value of -1 to TextIOBase.…
Jun 18, 2026
eff30be
Made 'size' argument from TextIOBase.readline positional only
Jun 19, 2026
4dd197d
Added news entry
Jun 19, 2026
e9abe5d
Updated method reference to _pyio
Saber0324 Jun 19, 2026
5562d18
Fix formatting
Saber0324 Jun 19, 2026
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2 changes: 1 addition & 1 deletion Lib/_pyio.py
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Original file line number Diff line number Diff line change
Expand Up @@ -1928,7 +1928,7 @@ def truncate(self, pos=None):
"""Truncate size to pos, where pos is an int."""
self._unsupported("truncate")

def readline(self):
def readline(self, size=-1, /):
"""Read until newline or EOF.
Returns an empty string if EOF is hit immediately.
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1 change: 1 addition & 0 deletions Misc/NEWS.d/next/Library/2026-06-18-23-59-46.gh-issue-151596.5ma144.rst
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@@ -0,0 +1 @@
Added missing ``size`` positional argument to :meth:`io.TextIOBase.readline`
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