Python – 重新格式化段落

当我们处理大量文本并将其呈现为可见格式时，需要格式化段落。我们可能只想打印每行特定宽度的内容，或者尝试在打印诗歌时增加每一行的缩进。在本章中，我们使用名为textwrap3的模块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

固定宽度包装

在此示例中，我们为段落中的每行指定30个字符的宽度。通过为宽度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，我们得到以下输出

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

在本例中，我们将要打印的每行诗歌的缩进增加了一个单位。

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

当我们运行上述程序时，我们得到以下输出

**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?