What is MRO in Python

MRO stands for Method Resolution Order. MRO denotes the way a programming language resolves a method or attribute. 

In Python, a class can inherit features and attributes from multiple classes and thus, multiple inheritance is implemented. MRO is the hierarchy in which base classes are searched when looking for a method in the parent class. First, the method or attribute is searched within a class and then it follows the order we specified while inheriting. 

#mro example

class A:
	def func(self):
		print("In Class A")

class B(A):
	def func(self):
		print("In Class B")

t = B()
t.func()

Output:

In Class B

In the above example the methods that are invoked are from class B but not from class A, and this is due to Method Resolution Order(MRO).
The order that follows in the above code is class B -> class A
In multiple inheritances, the methods are executed based on the order specified while inheriting the classes.