Python 模块学习：string模块1

Posted 2020-12-30 luoheng23

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string模块提供了许多字符串常量，如下所示：

__all__ = ["ascii_letters", "ascii_lowercase", "ascii_uppercase", "capwords",
           "digits", "hexdigits", "octdigits", "printable", "punctuation",
           "whitespace", "Formatter", "Template"]

# Some strings for ctype-style character classification
whitespace = ‘ 	

vf‘
ascii_lowercase = ‘abcdefghijklmnopqrstuvwxyz‘
ascii_uppercase = ‘ABCDEFGHIJKLMNOPQRSTUVWXYZ‘
ascii_letters = ascii_lowercase + ascii_uppercase
digits = ‘0123456789‘
hexdigits = digits + ‘abcdef‘ + ‘ABCDEF‘
octdigits = ‘01234567‘
punctuation = r"""!"#$%&‘()*+,-./:;<=>[email protected][]^_`{|}~"""
printable = digits + ascii_letters + punctuation + whitespace

这些常量在很多场合很有用处，比如要去掉字符串左边的所有字母：

>>> import string
>>> a = "asdfjsdnfnfjirrjwoe12345dsf6sdfjksdfj"
>>> a.lstrip(string.ascii_letters)
‘12345dsf6sdfjksdfj‘
>>>

提供了一个函数capwords，函数原型为：

def capwords(s, sep=None):
    return (sep or ‘ ‘).join(x.capitalize() for x in s.split(sep))

还有两个类：Template和Formatter，后续研究。