python - 如何检查字符串是否严格包含字母和数字

Question

如何检查字符串是否为 严格包含字母和数字？
跟随还不够？

def containsLettersAndNumber(input):
    if input.isalnum():
        return True
    else:
        return False


isAlnum = containsLettersAndNumber('abc')           # Should return false
isAlnum = containsLettersAndNumber('123')           # Should return false
isAlnum = containsLettersAndNumber('abc123')        # Should return true
isAlnum = containsLettersAndNumber('abc123$#')      # Should return true

请注意它必须包含字母和数字

Answer 1

您可以循环并跟踪您是否找到了一个字母以及是否找到了一个数字:

def containsLetterAndNumber(input):
    has_letter = False
    has_number = False
    for x in input:
        if x.isalpha():
            has_letter = True
        elif x.isnumeric():
            has_number = True
        if has_letter and has_number:
            return True
    return False

或者，一种更pythonic但更慢的方式:

def containsLetterAndNumber(input):
    return any(x.isalpha() for x in input) and any(x.isnumeric() for x in input)