1012. All Star Code Challenge #18

This Kata is intended as a small challenge for my students

All Star Code Challenge #18

Create a function that accepts 2 string arguments and returns an integer of the count of occurrences the 2nd argument is found in the first one.

If no occurrences can be found, a count of 0 should be returned.

("Hello", "o")  ==>  1
("Hello", "l")  ==>  2
("", "z")       ==>  0

Notes:

• The first argument can be an empty string
• The second string argument will always be of length 1

Solution:

def str_count(string, letter):
    func = lambda x: x == letter and True
    return [func(i) for i in string].count(True)