python string.py 源码分析 一

# Some strings for ctype-style character classification c风格字符串
whitespace = ' 	

vf'  #空白字符 	 制表符 
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