Codecademy Python3 Code Challenges 2: Count X

# Write your count_char_x function here:
def count_char_x(word, x):
  count = 0

  for letter in word:
    if letter == x:
      count += 1

  return count
# Uncomment these function calls to test your tip function:
print(count_char_x("mississippi", "s"))
# should print 4
print(count_char_x("mississippi", "m"))
# should print 1