python編程開發之textwrap文本樣式處理技巧

本文執行個體講述了python編程開發之textwrap文本樣式處理技巧。分享給大家供大家參考，具體如下：

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

在這裡我做了一個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 win32Type "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，進行拆分字串，然後逐行顯示

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 win32Type "copyright", "credits" or "license()" for more information.>>> ================================ RESTART ================================>>>   The textwrap module provides twoconvenience functions, wrap() andfill(), as well as 1   TextWrapper,the class that does all the work, andtwo utility functions, dedent() andindent(). If 2   you're just wrappingor filling one or two text strings, theconvenience functions should be good 3enough; otherwise, you should use aninstance of TextWrapper for efficiency.>>>

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

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 win32Type "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'>>>

希望本文所述對大家Python程式設計有所協助。

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