一。文本

1.每次处理一个字符

     1)list

     2)import sets

               >>> import sets

               >>> magic_chars=sets.Set(‘adboieihoejoewjo‘)

               >>> enchar=sets.Set(‘eijowj‘)

               >>> ‘‘.join(magic_chars & enchar)           #集合的交集

               ‘ijeow‘

               >>>

2.字符和字符值之间的转换

          >>> print ord(a)

          Traceback (most recent call last):

            File "<stdin>", line 1, in <module>

          NameError: name ‘a‘ is not defined

          >>> print ord(‘a‘)

          97

          >>> print chr(‘99‘)

          Traceback (most recent call last):

            File "<stdin>", line 1, in <module>

          TypeError: an integer is required

          >>> print chr(99)

          c

          >>> print repr(str(99)

          ...

          ... )

          ‘99‘

3.测试一个对象是否是类字符串

     >>> print isinstance(abc,basestring)

     Traceback (most recent call last):

       File "<stdin>", line 1, in <module>

     NameError: name ‘abc‘ is not defined

     >>> print isinstance(‘abc‘,basestring)

     True

4.字符串对齐

     >>> ‘abc‘.center(20,‘__‘)

     Traceback (most recent call last):

       File "<stdin>", line 1, in <module>

     TypeError: center() argument 2 must be char, not str

     >>>

     >>> print ‘abc‘.center(20,‘__‘)

     Traceback (most recent call last):

       File "<stdin>", line 1, in <module>

     TypeError: center() argument 2 must be char, not str

     >>> ‘abc‘.center(20,‘_‘)

     ‘________abc_________‘

     >>>

     >>> ‘aaa‘.ljust(20,‘@‘)

     ‘aaa@@@@@@@@@@@@@@@@@‘

     >>> ‘bbb‘.rjust(20,‘@‘)

     ‘@@@@@@@@@@@@@@@@@bbb‘

     >>>

5.去除字符串两端的空格

     >>> x=‘   p   ‘

     >>> x.ltrip()

     Traceback (most recent call last):

       File "<stdin>", line 1, in <module>

     AttributeError: ‘str‘ object has no attribute ‘ltrip‘

     >>> x.lstrip()

     ‘p   ‘

     >>> x.rstrip()

     ‘   p‘

     >>> x,strip()

     Traceback (most recent call last):

       File "<stdin>", line 1, in <module>

     NameError: name ‘strip‘ is not defined

     >>> x.strip()

     ‘p‘

     >>>

6.合并字符串

7.将字符串逐次反转

     #正则匹配 匹配空格

     astring=‘Hello World‘

     import re

     #split(r‘()‘,string)

     rewords=re.split(r‘(\s+)‘,astring)

     ‘ ‘.join(rewords)

8.检查字符串中是否包含某字符集合中的字符

9.简化字符串的translate的方法的使用

10.过滤字符串中不属于指定集合的字符

11.python 的itertools

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python学习笔记