python - 如何在 `textwrap.fill` 中保留双换行符？

Question

我有一个文本，由几个段落组成，段落之间用双换行符分隔。我想将它们格式化为 70 行宽，保留新行，整个内容应该以一个非缩进行开始，并带有 Abstract: Lorem ipsum ...。

所以整个事情应该是这样的:

Abstract: Magna risus nonummy mollis mattis neque commodo mattis fusce  
          hendrerit nibh. Lorem massa lorem mauris ad orci quam risus
          viverra aliquet senectus sociis. Donec proin nam dolor neque
          placerat imperdiet eros ullamcorper egestas cum torquent
          habitasse. Risus donec odio nostra ac et pede inceptos
          praesent montes. Neque morbi sit morbi vestibulum
          suspendisse mauris. Lacus massa mollis.

          Donec class integer pede ac sed elit. Fames augue magnis
          sapien natoque nisi. Proin augue mus nisl interdum convallis
          pellentesque conubia.

          Class dolor tempor netus suspendisse odio orci
          vestibulum mus. Netus purus. Lacus metus tempor purus
          adipiscing faucibus eget maecenas. Velit lacus integer
          rhoncus primis nunc quis lorem lacus dictumst hendrerit.

我正在尝试使用 textwrap，但这不会产生所需的输出。这是代码:

from loremipsum import get_paragraphs
import textwrap

text = '\n\n'.join(get_paragraphs(3))
item = 'Abstract: '

print textwrap.fill(item+text,initial_indent='',subsequent_indent=' '*len(item),replace_whitespace=False)

这对于第一段来说效果很好，但是接下来的段落会出现一些奇怪的缩进和短行，就像这样

Class vitae
          nonummy imperdiet cras blandit fusce. Massa porta metus
          semper tempor non id viverra eget. Purus morbi lorem semper
          eget. Proin magna tortor metus magnis. Vitae ipsum. Velit
          class aliquet tortor dolor parturient ullamcorper libero ac.

即使我使用 initial_indent=' '*len(item) 也会发生这种情况。这是一个错误吗？我怎样才能得到我想要的？

Answer 1

来自文档:

Note: If replace_whitespace is false, newlines may appear in the middle of a line and cause strange output. For this reason, text should be split into paragraphs (using str.splitlines() or similar) which are wrapped separately.

所以你应该这样做:

paragraphs = get_paragraphs(3)
item = 'Abstract: '
paragraphs[0] = item + paragraphs[0]
for idx, paragraph in enumerate(paragraphs):
    rest_indent = " "*len(item)
    start_indent = "" if idx == 0 else rest_indent
    print textwrap.fill(paragraph,initial_indent=start_indent,subsequent_indent=rest_indent,replace_whitespace=False)
    print ""

或者，使用列表理解:

paragraphs = get_paragraphs(3)
item = 'Abstract: '
text = "\n\n".join(textwrap.fill(p,initial_indent=' '*len(item),subsequent_indent=' '*len(item)) for p in paragraphs)
print item + text.lstrip()