Attribute __annotations__ containd in FunctionType.__dict__ but is not an attribute of "FunctionType" itself

[siegbert7]

Bug report

Bug description:

# Inconsistency between FunctionType and its __dict__

from  types import FunctionType as FunctionType

print(FunctionType.__dict__['__annotations__'])       # <attribute '__annotations__' of 'function' objects>
print(FunctionType.__annotations__)                   # AttributeError: type object 'function' has no attribute '__annotations__'

CPython versions tested on:

3.13

Operating systems tested on:

Windows

[KentaroJay]

Hi ✋ I am more than happy to take this task, can you assign me? @picnixz @AlexWaygood

[JelleZijlstra]

This is because the __annotations__ descriptor on type takes precedence and it throws AttributeError for static types, of which FunctionType is one. It's a little unfortunate but I'm not sure there's a better solution.

You can see similar discrepancies with some other attributes:

>>> types.FunctionType.__name__
'function'
>>> types.FunctionType.__dict__["__name__"]
<attribute '__name__' of 'function' objects>
>>> types.FunctionType.__module__
'builtins'
>>> types.FunctionType.__dict__["__module__"]
<member '__module__' of 'function' objects>

[siegbert7]

Thanks for your answer.

Sometimes I have to analyse an object. For this task normally I use a loop like

for attribute in given_obj.__dict__:

But it is difficult, if it works in some cases and, surprisingly, in others it doesn't. Well, after analysing what has happened, it is not that problem to make a workaround:

---

def print_attributes(given_obj):
    ''' Function to show attributes of a given object.'''
    for attr in given_obj.__dict__:
##        Make a workaround
##        try:
            print(attr, eval('given_obj.'+attr))
##        except AttributeError:                    # Sometimes __annotations__ gives an Error
##            print(attr, '*** AttributeError ***')


from  types import FunctionType as FunctionType
print_attributes(object)        # Sometimes it works ...
print_attributes(FunctionType)  # ... but sometimes it doesn't

---

For me, the problem should be fixed some day, but not with priority. For those, who make programs for third parties, bigger problems might rise with occasional errors.

[siegbert7]

Sorry for the format of my comment, I forget to check the previes before.