whats wrong with my code it work well in my local.

# E.g. word_count("I am that I am") gets back a dictionary like:
# {'i': 2, 'am': 2, 'that': 1}
# Lowercase the string to make it easier.
# Using .split() on the sentence will give you a list of words.
# In a for loop of that list, you'll have a word that you can
# check for inclusion in the dict (with "if word in dict"-style syntax).
# Or add it to the dict with something like word_dict[word] = 1.
def word_count(x):
    x =  x.lower()
    items = x.split()
    countr = dict()

    for i in items:
        if not i in countr:
            countr[i] = 1
        else:
            countr[i] += 1
    print countr

word_count("I am that I am")