write() 与 writelines() 和连接字符串 [英] write() versus writelines() and concatenated strings

问题描述

所以我正在学习 Python.我正在学习课程并遇到一个问题，我不得不将大量 target.write() 压缩成一个 write()，同时有一个 " " 在每个用户输入变量之间(write() 的对象).

So I'm learning Python. I am going through the lessons and ran into a problem where I had to condense a great many target.write() into a single write(), while having a " " between each user input variable(the object of write()).

我想出了:

nl = "
"
lines = line1, nl, line2, nl, line3, nl
textdoc.writelines(lines)

如果我尝试这样做:

textdoc.write(lines)

我收到一个错误.但是如果我输入:

I get an error. But if I type:

textdoc.write(line1 + "
" + line2 + ....)

然后它工作正常.为什么我不能在 write() 中使用字符串作为换行符，但我可以在 writelines() 中使用它?

Then it works fine. Why am I unable to use a string for a newline in write() but I can use it in writelines()?

Python 2.7

推荐答案

• writelines 需要一个可迭代的字符串
• write 需要一个字符串.
• writelines expects an iterable of strings
• write expects a single string.

line1 + " " + line2 将这些字符串合并为一个字符串，然后将其传递给 write.

line1 + " " + line2 merges those strings together into a single string before passing it to write.

请注意，如果您有很多行，您可能需要使用 " ".join(list_of_lines).

Note that if you have many lines, you may want to use " ".join(list_of_lines).

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