Python实用小技巧之判断输入是否为汉字/英文/数字

def is_chinese(input_string):
    for char in input_string:
        if not ('\u4e00' <= char <= '\u9fff'):
            return False
    return True

def is_english(word):
    for char in word:
        if not ('a' <= char <= 'z' or 'A' <= char <= 'Z'):
            return False
    return True

input1 = "中国"
input2 = "HelloWord"
input3 = "1234"
print(is_english(input1))  # False
print(is_english(input2))  # True
print(is_english(input3))  # False

import re
def is_english_regex(word):
    pattern = re.compile(r'^[a-zA-Z]+$')
    return bool(pattern.match(word))

def is_number(input_string):
    try:
        float(input_string)
        return True
    except ValueError:
        return False

input1 = "123"
input2 = "3.14"
input3 = "hello"

print(is_number(input1))  # True
print(is_number(input2))  # True
print(is_number(input3))  # False

def is_number(input_string):
    if input_string.isdigit():
        return True
    return False

input1 = "123"
input2 = "3.14"
input3 = "hello"

print(is_number(input1))  # True
print(is_number(input2))  # True
print(is_number(input3))  # False