python search first occurrence in string

1s = "the dude is a cool dude"
2s.find('dude') # returns 4 - the first index of the first match in the string

1#iterate through list
2for item in yourlist:
3    #if item is equal to a value
4    if item == 'value':
5        #store the item in a variable
6        yourvar = item
7        #break out of loop
8        break

1mystring.findfirstindex('dude') # should return 4