Map in python

Python map function

# The map function applies a function to every item in a list,
# and returns a new list.

numbers =  [0, -1, 2, 3, -4]

def square_func(n):
    return n*n
 
new_numbers = list(map(square_func, numbers))
#new_numbers: [0, 1, 4, 9, 16]

Map in python

# Python program to demonstrate working 
# of map. 
  
# Return double of n 
def addition(n): 
    return n + n 
  
# We double all numbers using map() 
numbers = (1, 2, 3, 4) 
result = map(addition, numbers) 
print(list(result))
# result [2, 4, 6, 8]

Map in python

items = [1, 2, 3, 4, 5]
squared = []
for i in items:
    squared.append(i**2)

Source: book.pythontips.com

Map in python

items = [1, 2, 3, 4, 5]
squared = list(map(lambda x: x**2, items))

Source: book.pythontips.com

Map in python

product = 1
list = [1, 2, 3, 4]
for num in list:
    product = product * num

# product = 24

Source: book.pythontips.com

Map in python

from functools import reduce
product = reduce((lambda x, y: x * y), [1, 2, 3, 4])

# Output: 24

-1

Source: book.pythontips.com

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