Need using python

4. Assume that phrase is a string. Return the number of words in phrase. Assume that words are separated by one or more blanks. You are not allowed to use the built-in function split() For example, countwords('The cat is black') would return 4. countwords('The cat is black') would also return 4. countwords('A whitecat and a black cow.') would also return 7. Test your program with the following: A white cat and a black cow' 'a b c de f g h "Orange you glad I didn't say banana