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gh-144380: Fix incorrect type check in buffered_iternext() #144381

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Merged
kumaraditya303 merged 1 commit into from
Feb 2, 2026
+3 −2
Merged

gh-144380: Fix incorrect type check in buffered_iternext() #144381

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1 change: 1 addition & 0 deletions Misc/NEWS.d/next/Library/2026-02-01-15-25-00.gh-issue-144380.U7py_s.rst
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Original file line number Diff line number Diff line change
@@ -0,0 +1 @@
Improve performance of :class:`io.BufferedReader` line iteration by ~49%.
4 changes: 2 additions & 2 deletions Modules/_io/bufferedio.c
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Original file line number Diff line number Diff line change
Expand Up @@ -1505,8 +1505,8 @@ buffered_iternext(PyObject *op)

_PyIO_State *state = find_io_state_by_def(Py_TYPE(self));
tp = Py_TYPE(self);
if (Py_IS_TYPE(tp, state->PyBufferedReader_Type) ||
Py_IS_TYPE(tp, state->PyBufferedRandom_Type))
if (tp == state->PyBufferedReader_Type ||
tp == state->PyBufferedRandom_Type)
{
/* Skip method call overhead for speed */
line = _buffered_readline(self, -1);
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