Bound methods that are the same are not equal (CPython incompatibility) #5233
Description
Sorry for not being able to be more specific in the issue description, suggestions welcome.
The coroutine of an object changes its identity every time it gets accessed:
class C:
async def test(self):
pass
>>> c=C()
>>> c.test==c.test
False
>>> a=c.test
>>> b=c.test
>>> a==b
False
>>> getattr(c,"test")
<bound_method 7f4067c383c0 <C object at 7f4067c37920>.<generator>>
>>> getattr(c,"test")
<bound_method 7f4067c38400 <C object at 7f4067c37920>.<generator>>
>>> getattr(c,"test")
<bound_method 7f4067c384c0 <C object at 7f4067c37920>.<generator>>
Therefore there is no way of storing a link to the coroutine and later comparing if the stored link actually belongs to the courotine of that class.
In Cpython this of course works:
class C:
async def test(self):
pass
>>> c=C()
>>> a=c.test
>>> b=c.test
>>> a==b
True
>>> c.test==c.test
True
>>>
When comparing the coroutines of a class then it works correctly:
>>> C.test==C.test
True
>>> a=C.test
>>> b=C.test
>>> a==b
True
With coroutines outside of classes it does work too:
async def test():
... pass
>>> a=test
>>> b=test
>>> a==b
True
>>> test==test
Is this behaviour fixable or a victim of optimizations and resource savings?