# Some strings for ctype-style character classification c风格字符串
whitespace = ' \t\n\r\v\f' #空白字符 \t 制表符 \n换行
lowercase = 'abcdefghijklmnopqrstuvwxyz'
uppercase = 'ABCDEFGHIJKLMNOPQRSTUVWXYZ'
letters = lowercase + uppercase
ascii_lowercase = lowercase
ascii_uppercase = uppercase
ascii_letters = ascii_lowercase + ascii_uppercase
digits = '0123456789' #十进制数字
hexdigits = digits + 'abcdef' + 'ABCDEF' #十六进制数
octdigits = '01234567' #八进制
punctuation = """!"#$%&'()*+,-./:;<=>?@[\]^_`{|}~""" #标点符号
printable = digits + letters + punctuation + whitespace #可打印字符串
