扫码加入数据分析学习群

def count_letter_number(string):
letter_count = 0
digit_count = 0
for ch in string:
if 'a' <= ch <= 'z' or 'A' <= ch <= 'Z':
letter_count += 1
elif '0' <= ch <= '9':
digit_count += 1
return letter_count, digit_count


def main():
print(count_letter_number('a1b2c3d4')) # (4, 4)
print(count_letter_number('a123456b')) # (2, 6)
print(count_letter_number('123456!!')) # (0, 6)


if __name__ == '__main__':
main()