[Python] How to use "/" (directory separator) in both Linux and Windows in Python?

I have written a code in python which uses / to make a particular file in a folder, if I want to use the code in windows it will not work, is there a way by which I can use the code in Windows and Linux.

In python I am using this code:

pathfile=os.path.dirname(templateFile)
rootTree.write(''+pathfile+'/output/log.txt')


When I will use my code in suppose windows machine my code will not work.

How do I use "/" (directory separator) in both Linux and Windows?

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