如何在Python中向文件中编写特殊字符（“\\ n”，“\\ b”，...）？

Question

I'm using Python to process some plain text into LaTeX, so I need to be able to write things like \\begin{enumerate} or \\newcommand to a file. When Python writes this to a file, though, it interprets \\b and \\n as special characters.

How do I get Python to write \\newcommand to a file, instead of writing ewcommand on a new line?

The code is something like this ...

with open(fileout,'w',encoding='utf-8') as fout:
    fout.write("\begin{enumerate}[1.]\n")

Python 3, Mac OS 10.5 PPC

Answer 1

One solution is to escape the escape character ( \\ ). This will result in a literal backslash before the b character instead of escaping b :

with open(fileout,'w',encoding='utf-8') as fout:
    fout.write("\\begin{enumerate}[1.]\n")

This will be written to the file as

\begin{enumerate}[1.]<newline>

(I assume that the \\n at the end is an intentional newline. If not, use double-escaping here as well: \\\\n .)

Answer 2

You just need to double the backslash: \\\\n , \\\\b . This will escape the backslash. You can also put the r prefix in front of your string: r'\\begin' . As detailed here , this will prevent substitutions.

Answer 3

You can also use raw strings:

with open(fileout,'w',encoding='utf-8') as fout:
    fout.write(r"\begin{enumerate}[1.]\n")

Note the 'r' before \\begin