[Python] Has handling of escape characters in quoted strings changed between Python 3.10 and...

I have a program that works under Python 3.10.2 Windows that contains a line like this:

outfilename = outpathname+"\cfile.txt"


outfilename ends up looking like c:\some\path\cfile.txt"

This code runs clean on 3.10.2.

I moved this code to another Windows system running Python 3.13.3

It generates syntax warnings:

C:\PythonCode\something.py:184: SyntaxWarning: invalid escape sequence '\c'
outfilename = outpathname+"\cfile.txt"


I didn't find any relevant details searching on "escape" in 3.13 changes. Is this a significant change? Should I have been using "\\c" to escape the "\" in the quoted string all along and now a warning has been added?

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