From: saber-bit <bryanventura0324@gmail.com>
Date: Sun, 21 Jun 2026 18:51:04 +0000 (-0400)
Subject: gh-151596: Add missing argument 'size' to pure-Python implementation of `TextIOBase... 
X-Git-Url: http://git.ipfire.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=30aeeb375b8f6c1f0eec95f7af60d3d4afa37f33;p=thirdparty%2FPython%2Fcpython.git

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

diff --git a/Lib/_pyio.py b/Lib/_pyio.py
index 993f94bc055b..4ba9b4070dff 100644
--- a/Lib/_pyio.py
+++ b/Lib/_pyio.py
@@ -1928,7 +1928,7 @@ 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`.