Tag: Python
-
Python multiple inheritance: Listing parents with __bases__
Does Python allow for multiple inheritance? Yes: And so: C.__bases__ returns: (<class ‘__main__.A’>, <class ‘__main__.B’>)
-
Python super() and the MRO: How method lookup climbs the hierarchy
In Python, super() searches the MRO until it finds a match:
-
Python inheritance: Skipping super().__init__ loses parent attributes
Didn’t call super() __init__ in your Python class? Attributes normally set on the parent won’t be on the child!
-
Python super().__init__: Passing arguments to the parent class
The most common place we use super() in Python? __init__:
-
Python super(): Misspelled method names raise AttributeError
Misspelled the method you invoke via super() in a Python method? It’s a runtime error: We get: AttributeError: ‘super’ object has no attribute ‘y’
-
Python’s super(): A proxy for calling parent-class methods
A Python method can invoke a method in the parent class with super(): super() doesn’t invoke the method. It’s a proxy on which you invoke the method you want.
-
Python method overriding: Child methods replace the parent’s
If a Python subclass defines a method with the same name as the parent, the parent’s method isn’t invoked:
-
Python method resolution order: Inheriting methods from a parent
Thanks to ICPO/MRO, if a child Python class doesn’t define a method, the parent method will be invoked:
-
Python method resolution order: Reading a class’s __mro__
Inheritance in Python changes the attribute lookup path, aka the “method resolution order,” or MRO: Child.__mro__ # (__main__.Child, object) Child.__mro__ # (__main__.Child, __main__.Parent, object)
-
Python class inheritance: Subclassing, __bases__, and isinstance
Set one Python class to inherit from another by putting the parent in (): Child.__bases__ # who does Child inherit from?