How to return to current working directory after cdin'g out in a batch file?

I have a batch file and I want to do the following...

cd C:\some\directory
some开发者_如何转开发_command.cmd
# return to the directory I started in here
python some_script.py

As you can see in the commented line, I need some way to return to the directory I started in. How can I do this?

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You can try pushd and popd commands see http://en.wikipedia.org/wiki/Pushd_and_popd

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set OLDDIR=%CD% rem current directory

rem your script 

chdir /d %OLDDIR% rem go to OLDDIR