Python Tutorial - Method Resolution Order MRO

Python Tutorial - Method Resolution Order MRO

[Seehart]

This covers the basic idea of inheritance, but does not cover mro. To understand mro, you need to cover cases where inheritance is different from DFS.

[abhishekbhardwaj]

Very nice explanation sir. But I have a doubt, why Python interpreter gives MRO TypeError while inheriting grandparent and then parent.

# Code:
class A:
pass

class B(A):
pass

class C(A, B): # This line gives error
pass

TypeError: Cannot create a consistent method resolution
order (MRO) for bases A, B


Again, thanks for such a good and simple explanation.

[ceeggtevfrhejchdj]

class A:
def foo(self):
print("A")

class B(A):
pass

class C(A):
def foo(self):
print("C")

class D:
def foo(self):
print("D")

class E(B, C, D):
pass

E().foo()

What will be displayed as a result of executing this code?
Try to work it out in your mind.

[waddragon]

this video doesn't explain MRO well. It only covers basic case, you won't still know how MRO works after this video in real situation.