python - 为什么 unicode 的中文字符串,调用 isalpha()或 isalnum()返回的是 True 呢?

Question

例如:

s = u"中国"
print s.isalpha()

输出竟然为True. 这是什么原因?
那么想判断字符串是否只有字母组成出了正则,还有什么好方法?

Answer 1

For unicode string, string.isalpha will determine whether the characters in the string are all composed of letters based on whether they belong to the LETTER area of ​​Unicode encoding. So the result is True, which does not necessarily mean that there are only 26 English letters.

Regular expressions should be the simplest method.

Of course you can:

def isAlpha(word):
    try:
        return word.encode('ascii').isalpha()
    except UnicodeEncodeError:
        return False

s = u"中国"
isAlpha(s)