Mapping applies a function to each value in a sequence and returns a new sequence of the results.
What is sequence?
In mathematics, a sequence is an enumerated collection of elements in which repeats are allowed and order is significant. It has members, just like a set. The length of the series is defined as the number of items. Unlike a set, the same components can appear numerous times in a sequence at different points, and the order does important. Formally, a sequence can be described as a function from natural numbers to the elements at each point. An indexed family, described as a function from an arbitrary index set, can be added to the concept of a sequence.
Python includes a built-in function called map(). The map() function calls the defined function and produces a list of results for each item in the iterable (e.g. list, tuple, etc.). The first argument in map() is that a function must be passed without being called. This means there aren't any parentheses.
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