How to create a dictionary in Python

Code from video:
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{'one': 1}
dict(one=1)
dict(1='one')

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[_UP-Yadav]

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[justgivemethetruth]

I want to create a current working directory data structure like this:
dir={ "subdirs" : [] , "files" : [] }
that keeps track of the files and subdirectories in any directory.
I cannot figure out how to address the inner lists, or add to them.
For example, how would I add the dot directory to itself to the subdirs list? "."

Then, how would I address that item?