python 判断字符串是否是纯中文或者英文

#判断是否是纯中文
def is_all_chinese(strs):
    for i in strs:
        if not '\u4e00' <= i <= '\u9fa5':
            return False
    return True

#判断是否是纯英文
def is_all_eng(strs):
    import string
    for i in strs:
        if i not in string.ascii_lowercase+string.ascii_uppercase:
            return False
    return True

#中文转换成unicode

def to_unicode(string):
    ret = ''
    for v in string:
        ret = ret + hex(ord(v)).upper().replace('0X', '\\u')
    return ret