Pure Functions

def multiply_by2(li):

new_list=[]

for item in li:

new_list.append(item*2)

return new_list

print(multiply_by2([1,2,3]))

#It doesnot effect in real world .

#But if we create new_list out side the fun so it give same output but it effect outside and we can't change inside the function .

#it also give effect the real world or on screen when we can write inside the function