Hi everywhere.
I decided to figure out why it is impossible to change methods of built-in
types and found
```
if (!(type->tp_flags & Py_TPFLAGS_HEAPTYPE)) {
PyErr_Format(
PyExc_TypeError,
"can't set attributes of built-in/extension type '%s'",
type->tp_name);
return -1;
}
```
in function type_setattro.
If comment this line and try to patch method __eq__ on the list for example the
code will work as expected
Test:
```
with patch("builtins.list.__eq__", return_value=False):
assert [] == []
```
Result: `AssertionError` as expected. Is there a real need to disallow patching
of built-in types or is it just legacy?
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