Python - 格式化段落

当我们处理大量文本并将其转换为可呈现的格式时，需要对段落进行格式化。 我们可能只想打印具有特定宽度的每一行，或者尝试在打印一首诗时增加每一行的缩进。 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

 pip install textwrap3 

固定宽度

在本例中，我们指定段落每行的宽度为 30 个字符。 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])

当我们运行上面的程序时，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的每一行的缩进。

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

当我们运行上面的程序时，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?