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bpo-42202: Store func annotations as a tuple (GH-23316)

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Reduce memory footprint and improve performance of loading modules having many func annotations.

  >>> sys.getsizeof({"a":"int","b":"int","return":"int"})
  232
  >>> sys.getsizeof(("a","int","b","int","return","int"))
  88

The tuple is converted into dict on the fly when `func.__annotations__` is accessed first.

Co-authored-by: Serhiy Storchaka <storchaka@gmail.com>
Co-authored-by: Inada Naoki <songofacandy@gmail.com>
This commit is contained in:
Yurii Karabas 2020-11-25 12:43:18 +02:00 • committed by GitHub
parent 85c84920f5
commit 7301979b23
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8 changed files with 174 additions and 155 deletions
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Python/ceval.c
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@ -3880,7 +3880,7 @@ _PyEval_EvalFrameDefault(PyThreadState *tstate, PyFrameObject *f, int throwflag)
func ->func_closure = POP();
}
if (oparg & 0x04) {
assert(PyDict_CheckExact(TOP()));
assert(PyTuple_CheckExact(TOP()));
func->func_annotations = POP();
}
if (oparg & 0x02) {