src.c:1:1: error: unknown type name 'def'
def most_frequent_word(text):
^
src.c: In function 'most_frequent_word':
src.c:1:29: error: expected declaration specifiers before ':' token
def most_frequent_word(text):
^
src.c:4:5: error: expected declaration specifiers before 'for'
for word in words:
^