Python Map function

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))

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]

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]

Source: thetechbrainer.com

Map in python

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

Source: book.pythontips.com

Python map function

numbers = [1, 2, 3, 4, 5]
  
def square(num):
    return num*num
  
squares = list(map(square, numbers))
print(squares)
 
# Output
# [1, 4, 9, 16, 25]

Source: programmersportal.com

Similar codes

6 votes335 views2 answers
Docker flask
Python Flask
0 vote272 views1 answer
Python get current class name
Python
0 vote303 views1 answer
Selenium python tkinter
Python
0 vote270 views1 answer
Python requests cannot find existing url
Python
7 votes267 views6 answers
Tensorflow version check
Python
0 vote346 views2 answers
Where should favicon.ico be placed in flask app
Python Flask
0 vote273 views1 answer
Onehotencoder example
Python
0 vote348 views1 answer
AssertionError: Relational field must provide a `queryset` argument, override `get_queryset`, or set read_only=`True`
Python
0 vote277 views1 answer
Full body tracking module
Python
0 vote307 views1 answer
Reset all weights tensorflow
Python