python開發_textwrap文本樣式

在看python的API的時候，發現python的textwrap在處理字符串樣式的時候功能強大

在這里我做了一個demo：

textwrap提供了一些方法：

wrap(text, width = 70, **kwargs):這個函數可以把一個字符串拆分成一個序列

from textwrap import *

#使用textwrap中的wrap()方法
def test_wrap():
    test_str = '''\
    The textwrap module provides two convenience functions, wrap() and fill(), as well as 1
    TextWrapper, the class that does all the work, and two utility functions, dedent() and indent(). If 2
    you’re just wrapping or filling one or two text strings, the convenience functions should be good 3
    enough; otherwise, you should use an instance of TextWrapper for efficiency. 4
    '''
    print(wrap(test_str, 20))

def main():
    test_wrap()

if __name__ == '__main__':
    main()

輸出效果：

Python 3.3.2 (v3.3.2:d047928ae3f6, May 16 2013, 00:03:43) [MSC v.1600 32 bit (Intel)] on win32
Type "copyright", "credits" or "license()" for more information.
>>> ================================ RESTART ================================
>>> 
['    The textwrap', 'module provides two', 'convenience', 'functions, wrap()', 'and fill(), as well', 'as 1', 'TextWrapper, the', 'class that does all', 'the work, and two', 'utility functions,', 'dedent() and', 'indent(). If 2', 'you’re just wrapping', 'or filling one or', 'two text strings,', 'the convenience', 'functions should be', 'good 3     enough;', 'otherwise, you', 'should use an', 'instance of', 'TextWrapper for', 'efficiency. 4']
>>> 

我們會發現，wrap()函數，把字符串拆分成了一個序列，在這個序列中，每個元素的長度是一樣的。

fill(text, width=70, **kwargs) :該方法可以根據指定的長度，進行拆分字符串，然后逐行顯示

from textwrap import *

#fill()方法
def test_wrap():
    test_str = '''\
    The textwrap module provides two convenience functions, wrap() and fill(), as well as 1
    TextWrapper, the class that does all the work, and two utility functions, dedent() and indent(). If 2
    you’re just wrapping or filling one or two text strings, the convenience functions should be good 3
    enough; otherwise, you should use an instance of TextWrapper for efficiency. 4
    '''
    print(fill(test_str, 40))
   
def main():
    test_wrap()

if __name__ == '__main__':
    main()

運行效果：

Python 3.3.2 (v3.3.2:d047928ae3f6, May 16 2013, 00:03:43) [MSC v.1600 32 bit (Intel)] on win32
Type "copyright", "credits" or "license()" for more information.
>>> ================================ RESTART ================================
>>> 
    The textwrap module provides two
convenience functions, wrap() and
fill(), as well as 1     TextWrapper,
the class that does all the work, and
two utility functions, dedent() and
indent(). If 2     you’re just wrapping
or filling one or two text strings, the
convenience functions should be good 3
enough; otherwise, you should use an
instance of TextWrapper for efficiency.
4
>>> 

dedent()方法->文本進行不縮進顯示，相應的indent()方法 -> 進行縮進顯示

from textwrap import *

#dedent()方法
def test_wrap():
    test_str = '''\
    The textwrap module provides two convenience
        functions, wrap() and fill(), as well as 1
    TextWrapper, the class that does all the work,
        and two utility functions, dedent() and indent(). If 2
    you’re just wrapping or filling one or two text strings,
        the convenience functions should be good 3
    enough; otherwise, you should use an instance
        of TextWrapper for efficiency. 4
    '''
    print(repr(dedent(test_str)))

def main():
    test_wrap()

if __name__ == '__main__':
    main()

運行效果：

Python 3.3.2 (v3.3.2:d047928ae3f6, May 16 2013, 00:03:43) [MSC v.1600 32 bit (Intel)] on win32
Type "copyright", "credits" or "license()" for more information.
>>> ================================ RESTART ================================
>>> 
'The textwrap module provides two convenience\n    functions, wrap() and fill(), as well as 1\nTextWrapper, the class that does all the work,\n    and two utility functions, dedent() and indent(). If 2\nyou’re just wrapping or filling one or two text strings,\n    the convenience functions should be good 3\nenough; otherwise, you should use an instance\n    of TextWrapper for efficiency. 4\n'
>>>