https://github.com/python/cpython/commit/bd39eea0dbb9dc9ec04144f34498eb4e8cc61b32
commit: bd39eea0dbb9dc9ec04144f34498eb4e8cc61b32
branch: 3.15
author: Miss Islington (bot) <[email protected]>
committer: ZeroIntensity <[email protected]>
date: 2026-06-23T12:41:17-04:00
summary:

[3.15] gh-151596: Add missing argument 'size' to pure-Python implementation of 
`TextIOBase.readline` (GH-151679) (GH-151870)

(cherry picked from commit 30aeeb375b8f6c1f0eec95f7af60d3d4afa37f33)

Co-authored-by: saber-bit <[email protected]>

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 9739b6d37fb21b5..342a50724d49fba 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 000000000000000..17ec1341142e93d
--- /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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