PYTHON

map example 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))

# Output :-

# 1 + 1 = 2 / 2 + 2 = 4 / 3 + 3 = 6 / 4 + 4 = 8

[2, 4, 6, 8]

# Example With Strings :-


# List of strings
my_list = ['sat', 'bat', 'cat', 'mat']
   
# map() can listify the list of strings individually
test = list(map(list, my_list))
print(test)

# Output :-

# listify the list of strings individually Like :-

# 'sat' 3 Letters ==> The Function is Offered Individually :- 's', 'a', 't'

[['s', 'a', 't'], ['b', 'a', 't'], ['c', 'a', 't'], ['m', 'a', 't']]

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 function 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))

Python Map function

# Let's define general python function
>>> def doubleOrNothing(num):
...     return num * 2

# now use Map on it.
>>> map(doubleOrNothing, [1,2,3,4,5])
<map object at 0x7ff5b2bc7d00>

# apply built-in list method on Map Object
>>> list(map(doubleOrNothing, [1,2,3,4,5])
[2, 4, 6, 8, 10]

# using lambda function
>>> list(map(lambda x: x*2, [1,2,3,4,5]))
[2, 4, 6, 8, 10]

python dictionary map function

dictionary = {k: f(v) for k, v in dictionary.items()}

função map python

lista =  [1, 2, -3, 4, 5, -9]
def quadrado(n):
    return n*n
 
map(quadrado, lista)
[1, 4, 9, 16, 25, 81]

Python Map Function Syntax

map(fun, iter)

map function in pyhton

# 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 = addition(numbers)
print(list(result))

when to use map function in python

#The map function is used to do a certain function to a certain iterable
#It takes a function and an iterable
numbers = [1,2,3,4,5,6,7,8,9,10]
x = map(lambda nom : nom*nom, numbers)
print(list(x))
#So here my function is the lambda and the iterable is the numbers list
#And with this I apply nom*nom to every item to the list
# if I didn't put the list function before x it would print map object at .....

python own function and map function

def myMapFunc(s):
    return s.upper()
my_str = "welcome to guru99 tutorials!"
updated_list = map(myMapFunc, my_str)
print(updated_list)
for i in updated_list:
    print(i, end="")