How can I find the first occurrence of a sub-string in a python string?

Question

So if my string is "the dude is a cool dude".
I'd like to find the first index of 'dude':

mystring.findfirstindex('dude') # should return 4

What is the python command for this?
Thanks.

Answer 1

find()

>>> s = "the dude is a cool dude"
>>> s.find('dude')
4