尝试创建一个函数来返回字母总数、大写字母、小写字母、数字和其他字符，但似乎不起作用- Python

def count_characters(string):
    total_count = len(string)
    uppercase_count = 0
    lowercase_count = 0
    digit_count = 0
    other_count = 0

    for char in string:
        if char.isupper():
            uppercase_count += 1
        elif char.islower():
            lowercase_count += 1
        elif char.isdigit():
            digit_count += 1
        else:
            other_count += 1

    return total_count, uppercase_count, lowercase_count, digit_count, other_count

string = "Hello World! 123"
result = count_characters(string)
print(result)