[Python] Can I tell Python to execute command line in cmd?

I'm working on a personal project as a very amateur programmer and to do this, I need to have python tell cmd to run an external program via command line.

For example, I need to chdir ("C:\blah\blah") on Python, and run externalprogram -w "<destination>\newName.fileType>" "<source>\*.*".

I'm very lost in how to do this and any help would be greatly appreciated.

So far my code looks like this

import os

os.chdir('C:\Program Files (x86)\<externalProgram>')
os.system('<externalCommand> "<destination>\file.fileType" "<source>\*.*"')


Still can't get it to work though no errors are being posted to the shell.

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