https://github.com/python/cpython/commit/30aeeb375b8f6c1f0eec95f7af60d3d4afa37f33
commit: 30aeeb375b8f6c1f0eec95f7af60d3d4afa37f33
branch: main
author: saber-bit <[email protected]>
committer: ZeroIntensity <[email protected]>
date: 2026-06-21T14:51:04-04:00
summary:
gh-151596: Add missing argument 'size' to pure-Python implementation of
`TextIOBase.readline` (GH-151679)
files:
A Misc/NEWS.d/next/Library/2026-06-18-23-59-46.gh-issue-151596.5ma144.rst
M Lib/_pyio.py
diff --git a/Lib/_pyio.py b/Lib/_pyio.py
index 993f94bc055b2e..4ba9b4070dff93 100644
--- a/Lib/_pyio.py
+++ b/Lib/_pyio.py
@@ -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.
diff --git
a/Misc/NEWS.d/next/Library/2026-06-18-23-59-46.gh-issue-151596.5ma144.rst
b/Misc/NEWS.d/next/Library/2026-06-18-23-59-46.gh-issue-151596.5ma144.rst
new file mode 100644
index 00000000000000..17ec1341142e93
--- /dev/null
+++ b/Misc/NEWS.d/next/Library/2026-06-18-23-59-46.gh-issue-151596.5ma144.rst
@@ -0,0 +1 @@
+Add missing ``size`` positional argument to the pure-Python implementation of
:meth:`io.TextIOBase.readline`.
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