classmethod_descriptor #4690

Feature

# In CPython
>>> type(dict.__dict__["fromkeys"])
<class 'classmethod_descriptor'>
>>> type(dict.fromkeys)
<class 'builtin_function_or_method'>

# In RustPython
>>>>> type(dict.__dict__["fromkeys"])
<class 'classmethod'>
>>>>> type(dict.fromkeys)
<class 'builtin_function_or_method'>

• <class 'classmethod'> is for descriptors of Python-side @classmethod.
  • PyClassMethod_Type in CPython
  • PyClassMethod in RustPython
• <class 'classmethod_descriptor'> is for descriptors of native-side class method.
  • PyClassMethodDescr_Type in CPython
  • Nothing in RustPython, instead using PyClassMethod

(Yeah, these names are somewhat confusing...)

In short, RustPython uses a different type from CPython for built-in class methods.

I don't know if it causes any real difference in behavior. There is no test for this in CPython (only a mysterious comment exists)

Python Documentation

No documents were found.