How to add pairs to a dict?

[Anthony Liu]

I want to keep adding pairs my phone_book dict like
so:

phone_book={'jack':2313, 'john':3436}

And then each time when a new pair is created, for
example, 'tom':5678, I want to add it to the dict so
that the dict becomes 

phone_book={'jack':2313, 'john':3436}



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