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textwrap文本包装和填充

时间:2021-07-01 10:21:17 帮助过:36人阅读

python模块学习- textwrap 文本包装和填充

代码实例:

sample_text = '''

The textwrap module can beused to format text for output in

situations wherepretty-printing is desired. It offers

programmatic functionalitysimilar to the paragraph wrapping

or filling features found inmany text editors.

'''

段落填充:

import textwrap
from textwrap_exampleimport sample_text
   
print 'Nodedent:\n'
printtextwrap.fill(sample_text, width=50)


执行结果:

# pythontextwrap_fill.py

No dedent:


The textwrap module can be used to format

text for outputin situations where pretty-

printing is desired. It offers programmatic

functionalitysimilar to the paragraph wrapping

or fillingfeatures found in many text editors.

结果为左对齐,第一行有缩进。行中的空格继续保留。

移除缩进:

import textwrap
fromtextwrap_example import sample_text
   
dedented_text = textwrap.dedent(sample_text)
print 'Dedented:'
printdedented_text


执行结果:

# pythontextwrap_dedent.py

Dedented:


The textwrapmodule can be used to format text for output in

situations wherepretty-printing is desired. It offers

programmaticfunctionality similar to the paragraph wrapping

or fillingfeatures found in many text editors.

这样第一行就不会缩进。

结合移除缩进和填充:

import textwrap
fromtextwrap_example import sample_text
   
dedented_text =textwrap.dedent(sample_text).strip()
for width in [ 45,70 ]:
       print '%d Columns:\n' % width
       print textwrap.fill(dedented_text,width=width)
       print


执行结果:

# pythontextwrap_fill_width.py

45 Columns:


The textwrapmodule can be used to format

text for output insituations where pretty-

printing isdesired. It offers programmatic

functionalitysimilar to the paragraph

wrapping orfilling features found in many

text editors.


70 Columns:


The textwrapmodule can be used to format text for output in

situations wherepretty-printing is desired. It offersprogrammatic

functionality similarto the paragraph wrapping or filling features

found in many texteditors.

悬挂缩进:悬挂缩进第一行的缩进小于其他行的缩进。

import textwrap
fromtextwrap_example import sample_text
   
dedented_text =textwrap.dedent(sample_text).strip()
printtextwrap.fill(dedented_text,
                    initial_indent='',
                    subsequent_indent=' ' * 4,
                    width=50,
                    )
       执行结果:
# pythontextwrap_hanging_indent.py
The textwrapmodule can be used to format text for
    output in situations where pretty-printingis
    desired. It offers programmatic functionality
    similar to the paragraph wrapping orfilling
    features found in many text editors.


其中的’’*4还可以使用其他字符代替。


TextWrap提供函数wrap()和fill(), 以及TextWrapper类,工具函数dedent(). 通常包装或者填充一两个字符串使用wrap()和fill()。其他情况使用TextWrapper更高效。


textwrap.wrap(text[,width[, ...]])

包装单个段落(text为输入,系字符串),每行最长宽度width。返回输出行的列表,最后行无换行符。Width默认70。


textwrap.fill(text[,width[, ...]])

包装单段文字,并返回包含包裹段落的字符串。实际上是"\n".join(wrap(text,...))的缩写。wrap() and fill()创建TextWrapper实例,并调用一个方法。这些实例不被重用,所以包装/填充很多文本字符串要构造自己的TextWrapper对象更有效。TextWrapper.break_long_words设置是否拆长单词。

textwrap.dedent(text)

反缩进去除每行行首的空白。这方便显示三引号中的内容而不修改其源代码中的缩进。

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