如何将字符串保存为带引号的字符串？

Question

我有一个文件file.md，我想读取该文件并将其作为字符串获取。然后，我想获取该字符串并将其保存在另一个文件中，但另存为带引号（和所有）的字符串。原因是我想将markdown文件的内容传输到markdown字符串，以便可以使用javascript marked库将其包含在html中。

如何使用python脚本做到这一点？

这是我到目前为止尝试过的：

with open('file.md', 'r') as md:
    text=""
    lines = md.readlines()
    for line in lines:
        line = "'" + line + "'" + '+'
        text = text + line
    with open('file.txt', 'w') as txt:
        txt.write(text)

输入file.md

This is one line of markdown
This is another line of markdown

This is another one

所需的输出：file.txt

"This is one line of markdown" +
"This is another line of markdown" +
(what should come here by the way to encode an empty line?)
"This is another one"

Answer 1

这里需要注意两件事。首先，在迭代器line通过lines运行时，请勿更改它。而是将其分配给新的字符串变量（我称其为new_line）。其次，如果在每个line的末尾添加更多字符，则它将被放置在行尾字符之后，因此在将其写入新文件时将其移至下一行。而是跳过每行的最后一个字符并手动添加换行符。

如果我理解的正确，这应该给您想要的输出：

with open('file.md', 'r') as md:
    text = ""
    lines = md.readlines()

for line in lines:
    if line[-1] == "\n":
        text += "'" + line[:-1] + "'+\n"
    else:
        text += "'" + line + "'+"

with open('file.txt', 'w') as txt:
    txt.write(text)

注意最后一行与其他行之间的区别（没有eol-char，没有+号）。text += ...将更多字符添加到现有字符串。

这也可以，并且可能会更好一些，因为它避免了if语句。您可以在从file.md读取内容时删除换行符。最后，您跳过内容的最后两个字符，即+和\n。

with open('file.md', 'r') as md:
    text = ""
    lines = [line.rstrip('\n') for line in md]

for line in lines:
    text += "'" + line + "' +\n"

with open('file.txt', 'w') as txt:
    txt.write(text[:-2])

...并使用格式化程序：

text += "'{}' +\n".format(line)

...按照评论中的要求检查空行：

for line in lines:
    if line == '':
        text += '\n'
    else:
        text += "'{}' +\n".format(line)

Answer 2

此作品：

>>> a = '''This is one line of markdown
... This is another line of markdown
... 
... This is another one'''
>>> lines = a.split('\n')
>>> lines = [ '"' + i + '" +' if len(i) else i for i in lines]
>>> lines[-1] = lines[-1][:-2]   # drop the '+' at the end of the last line
>>> print '\n'.join( lines )
"This is one line of markdown" +
"This is another line of markdown" +

"This is another one"

您可以自己对文件进行读写。