word_count I have checked my code in the workspaces and i got the expected output But cannot check it

# E.g. word_count("I do not like it Sam I Am") gets back a dictionary like:
# {'i': 2, 'do': 1, 'it': 1, 'sam': 1, 'like': 1, 'not': 1, 'am': 1}
# Lowercase the string to make it easier.
def word_count(item):
    word_list=item.split(" ")

    low_word_list=[]
    for word in word_list:
        low_word=word.lower()
        low_word_list.append(low_word)

    i=0
    word_dict={}
    while i<len(low_word_list):
        j=1
        if low_word_list[i] not in word_dict.keys():
            word_dict.update({low_word_list[i]:j})
            i+=1
        else:
            m=word_dict[low_word_list[i]]+1
            word_dict.update({low_word_list[i]:m})
            i+=1

    return word_dict