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

2 votes138 views2 answers
Python replace only first instance
Python
0 vote144 views2 answers
Check status code urllib
Python
0 vote134 views1 answer
Nested for loop table python
Python
1 vote162 views1 answer
Pyhton turtle delete
Python
0 vote140 views1 answer
Assert vs validate in python
Python
0 vote155 views1 answer
Pyelastic search get document
Python
0 vote134 views1 answer
Python elementTree tostring write() argument must be str, not bytes
Python
0 vote187 views1 answer
Dictionary to a dataframe pandas arrays must all be same length
Python
0 vote180 views1 answer
Input without pressing enter python
Python
0 vote168 views1 answer
For loop to create a set of counters in python
Python