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Maps in Python are called dict. To create one, you have to choose an hashable object as key and a value.
What is an hashable object?
An hashable object is an object with a hash which never changes during its lifetime. Such objects are called immutable.
Python offers the following hashable built-in objects.
As of today there are around 7.7 bilion people in the world.
Image that we have a file containing all the people, line by line like this: