From: Miss Islington (bot) <31488909+miss-islington@users.noreply.github.com>
Date: Tue, 23 Jun 2026 16:41:37 +0000 (+0200)
Subject: [3.13] gh-151596: Add missing argument 'size' to pure-Python implementation of `TextI... 
X-Git-Url: http://git.ipfire.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=0ba3fcdf2f42ffec7e736595cfa68771e03d8cc2;p=thirdparty%2FPython%2Fcpython.git

[3.13] gh-151596: Add missing argument 'size' to pure-Python implementation of `TextIOBase.readline` (GH-151679) (GH-151872)

(cherry picked from commit 30aeeb375b8f6c1f0eec95f7af60d3d4afa37f33)

Co-authored-by: saber-bit <bryanventura0324@gmail.com>
---

diff --git a/Lib/_pyio.py b/Lib/_pyio.py
index 7c1635cb3310..f0a1fa2da426 100644
--- a/Lib/_pyio.py
+++ b/Lib/_pyio.py
@@ -1856,7 +1856,7 @@ class TextIOBase(IOBase):
         """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 000000000000..17ec1341142e
--- /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`.