Feature or enhancement

PyObject_HasAttrString is implemented in terms of PyObject_GetAttrString / PyErr_Clear.
for non-existing attributes, there's significant overhead from creating an error only to clear it later.
this can be optimized by implementing it in terms of PyObject_HasAttr.

microbenchmark

python -m pyperf timeit -s '
import _testcapi
hasattr_string = _testcapi.hasattr_string

class A:
  def __init__(self):
    self.attr = 1

a = A()' 'hasattr_string(a, "noattr")'
.....................
Mean +- std dev: 487 ns +- 7 ns

Linked PRs

• gh-104078: Improve performance of PyObject_HasAttrString #104079