Python Map function

Python’s Map built-in function: perform function on iterables

When using map built-in function in python you have to create a function first then use the map() method which performs a specific given function on an iterable mostly lists.
Map takes two arguments, a function and an iterable i.e
Map(function, list)
The function may be created before the map (with def) or inside the map (with lambda)**Note: if you need a tutorial on functions, you can check my python post lists**
Example 1:
Program to get squares of a list on numbers
Solution
# In this case we will use lambda because we are dealing with a function that has only one statement
>>> print(map(lambda x: x**2, [1,2,3,4,5,6,7,8,9]))
>>> map object
#By the way map returns an object that can also be iterated upon
>>> for i in map(lambda x: x**2, [1,2,3,4,5,6,7,8,9]):
>>> print(i)
>>>    1
4
9
16
25
36
49
64
81
# Or you can define a function first
def Square(x):
return x**2
for i in map(Square, [1,2,3,4,5,6,7,8,9]):
print(i)
#This program still does the same thing as the above program
**NOTE** Map is not only for mathematical operations, as long as you want to work on an iterable it is a go.

EXCERCISES (use map with or without other logics):
*Create a program that solves the cubes of a list  of numbers from 1-20

*Create a program that returns the middle character of a list of  odd length words. E.g [“cat”,”carpets”,”mushrooms”]

*Create a program that returns the splited version of the any list of lists e.g [[“My name is python”],[“Python is the best”]] will return
[‘My’,’name’,‘is’,‘python’]
[‘Python’ ,‘is’ ,‘the’ ,‘best’]

Play with the above exercises and give yourself problems to solve.

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