Python - 段落重新格式化

当处理大量文本并将其整理成可呈现的格式时，需要对段落进行格式化。我们可能只想以特定的宽度打印每一行，或者在打印诗歌时尝试为每一行增加缩进。在本章中，我们使用名为textwrap3的模块来根据需要格式化段落。

首先，我们需要安装所需的包，如下所示

 pip install textwrap3 

固定宽度换行

在这个例子中，我们为段落的每一行指定了30个字符的宽度。通过为width参数指定一个值来使用wrap函数。

from textwrap3 import wrap

text = 'In late summer 1945, guests are gathered for the wedding reception of Don Vito Corleones daughter Connie (Talia Shire) and Carlo Rizzi (Gianni Russo). Vito (Marlon Brando), the head of the Corleone Mafia family, is known to friends and associates as Godfather. He and Tom Hagen (Robert Duvall), the Corleone family lawyer, are hearing requests for favors because, according to Italian tradition, no Sicilian can refuse a request on his daughters wedding day.'

x = wrap(text, 30)
for i in range(len(x)):
    print(x[i])

运行上述程序后，我们将得到以下输出：

In late summer 1945, guests
are gathered for the wedding
reception of Don Vito
Corleones daughter Connie
(Talia Shire) and Carlo Rizzi
(Gianni Russo). Vito (Marlon
Brando), the head of the
Corleone Mafia family, is
known to friends and
associates as Godfather. He
and Tom Hagen (Robert Duvall),
the Corleone family lawyer,
are hearing requests for
favors because, according to
Italian tradition, no Sicilian
can refuse a request on his
daughters wedding day.

可变缩进

在这个例子中，我们增加了要打印的诗歌每一行的缩进。

import textwrap3

FileName = ("path\poem.txt")

print("**Before Formatting**")
print(" ")

data=file(FileName).readlines()
for i in range(len(data)):
   print data[i]
   
print(" ")
print("**After Formatting**")
print(" ")
data=file(FileName).readlines()
for i in range(len(data)):
   dedented_text = textwrap3.dedent(data[i]).strip()
   print dedented_text

运行上述程序后，我们将得到以下输出：

**Before Formatting**

 Summer is here.
  Sky is bright.
	Birds are gone.
	 Nests are empty.
	  Where is Rain?

**After Formatting**
 
Summer is here.
Sky is bright.
Birds are gone.
Nests are empty.
Where is Rain?