"pass" same as "return None" in Python?

Question

I have been learning python about a week now, below is the question:

Code

def Foo():     pass  def Bar():     return None 

Usage

a = Foo() print(a) # None b = Bar() print(b) # None 

Question: 1. Why do we need pass when we already have return None? Is there some scenario that return None can not handle but pass can?

Answer 1

pass is an "empty" command, but return stops the function / method.

Examples:

def func():     do_something()      #executed     pass     do_something_else() #also executed 

but:

def func2():     do_something()      #executed     return None     do_something_else() #NOT executed 

In the second case, return None is: "stop the function and return None". But pass is just like "go to the next line"