如何检测字符串中的非ASCII字符？

def is_ascii(s):
    return all(ord(c) < 128 for c in s)

string = "Hello, 你好"
if is_ascii(string):
    print("字符串中只包含ASCII字符")
else:
    print("字符串中包含非ASCII字符")

import re

string = "Hello, 你好"
if re.search(r'[^\x00-\x7F]', string):
    print("字符串中包含非ASCII字符")
else:
    print("字符串中只包含ASCII字符")

def is_ascii(s):
    return all(0 <= ord(c) < 128 for c in s)

string = "Hello, 你好"
if is_ascii(string):
    print("字符串中只包含ASCII字符")
else:
    print("字符串中包含非ASCII字符")