python - write() versus writelines() and concatenated strings

Question

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()).

I came up with:

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

If I try to do:

textdoc.write(lines)

I get an error. But if I type:

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

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

Answer 1

• writelines expects an iterable of strings
• write expects a single string.

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

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