Using python to implement the STRCMP function function example

Implement this function I believe you must understand his meaning, very simple, the following code you refer to use it

def strcmp(str1,str2):
        i = 0
        while i<len(str1) and i<len(str2):
                outcome = cmp(str1[i],str2[i])
                if outcome:
                        print outcome
                        return outcome
                i +=1
        return cmp(len(str1),len(str2))
str1='dfdcd'
str2='dfdc'
print strcmp(str1,str2)
print cmp(str1,str2)