Python - 段落重新格式化

當處理大量文字並將其整理成可呈現的格式時，需要對段落進行格式化。我們可能只想以特定的寬度列印每一行，或者在列印詩歌時嘗試為每一行增加縮排。在本章中，我們使用名為textwrap3的模組來根據需要格式化段落。

首先，我們需要安裝所需的包，如下所示

 pip install textwrap3 

固定寬度換行

在這個例子中，我們為段落的每一行指定了30個字元的寬度。透過為width引數指定一個值來使用wrap函式。

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])

執行上述程式後，我們將得到以下輸出：

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.

可變縮排

在這個例子中，我們增加了要列印的詩歌每一行的縮排。

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

執行上述程式後，我們將得到以下輸出：

**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?