计算字符串中大小写个数python

 def seperate(word):
    big = 0;small = 0
    for c in word:
        if 65<=ord(c)<=90:
            big += 1
        elif 97<=ord(c)<=122:
            small += 1
        else:
            continue
    return (big,small)
word = input()
print(seperate(word))