[Python] Nested get function

I need a clarification on the built-in function get. The example is from here. The code:

test_dict = {'Gfg' : {'is' : 'best'}}
res = test_dict.get('Gf', {}).get('is')
print("The nested safely accessed value is : " + str(res))


I understand that get fn is strictly for retrieving values for a given key in a dictionary.

1. What is the purpose of including {} in the outer get fn?
2. In a nested get function, does the get fn work from inner to out or vice-versa?

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