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map() and filter() are built-in function in python library. These functions are generally written in one line and allows programmer to optimize the code length. Both map() and filter() function returns the map and filter object respectively. Both the function operates on iterables with a specified function. Generally lambda function is used instead of normal python function. While reduce() function resides on python 'functools' module.

People who are new to python programming finds hard to understand two types of function arguments python provides namely *agrs and **kwargs. Let me be clear about one thing, you need not necessarily name those arguments as by same name as above (args and kwargs) you can name those argument as your choice(eg- *agr , *agrs) what is important is that asterisk(*) symbol.