grihabor opened a new pull request, #41086:
URL: https://github.com/apache/airflow/pull/41086
Fixes #41085
Here is a small example to illustrate the problem:
```python
class InitMeta(type):
def __new__(cls, name, bases, namespace, **kwargs):
new_cls = super().__new__(cls, name, bases, namespace, **kwargs)
new_cls.__init__ = new_cls.__init__
return new_cls
class A(metaclass=InitMeta):
def __init__(self):
print("A")
super().__init__()
class B(A):
pass
class C(A):
def __init__(self):
print("C")
super().__init__()
class D(B, C):
pass
D()
```
This outputs:
```
A
```
But without metaclass the output is:
```
C
A
```
This happens because `B.__init__` was set to `A.__init__` at the B class
definition time, but this is not what MRO is doing.
To fix this, I propose patching `__init__` only if the class actually
defines it's own `__init__`
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