[Python] Why does my recursive function return None?

I have this function that calls itself:

def get_input():
my_var = input('Enter "a" or "b": ')

if my_var != "a" and my_var != "b":
print('You didn\'t type "a" or "b". Try again.')
get_input()
else:
return my_var

print('got input:', get_input())


Now, if I input just "a" or "b", everything works fine:

Type "a" or "b": a
got input: a


But, if I type something else and then "a" or "b", I get this:

Type "a" or "b": purple
You didn't type "a" or "b". Try again.
Type "a" or "b": a
got input: None


I don't know why get_input() is returning None since it should only return my_var. Where is this None coming from and how do I fix my function?

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