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map python

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iamserda answered on May 11, 2020 Popularity 9/10 Helpfulness 2/10

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Map Function in Python:

# Welcome to Python World!
# return a list of the price for these items
items = [{"name": "Mango", "price": 11.26},
         {"name": "Apple", "price": 8.65},
         {"name": "Watermelon", "price": 4.31},
         {"name": "Orange", "price": 5.96}]

# Using programming fundamentals and intuition:
def get_price_values(some_list):
  local_list = list()
  for item in some_list:
    local_list.append(item["price"])
  return local_list

# Using functional programming intuition: map(...)
def get_price_with_lambda(some_list):
  return list(map(lambda item: item["price"], items))

def get_price_(some_list):
  def local_func(item):
    return item["price"]
  return list(map(local_func, items))

def test_():
    assert get_price_values(items) == [11.26, 8.65, 4.31, 5.96]
    assert get_price_with_lambda(items)== [11.26, 8.65, 4.31, 5.96]
    assert get_price_(items) == [11.26, 8.65, 4.31, 5.96]
    print("Passed!")

test_() # Passed!

Why should you use map?

That's like asking why you should use for or while...

- it is part of the language.

- it saves you time, and code

- making use of Python's powerful Higher Order Functions.

Unfortunately, it is no more efficient than the conventional way.

Conventional way applies for just about any language.

Popularity 9/10 Helpfulness 2/10 Language python

Source: Grepper

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Contributed on May 04 2023

iamserda

0 Answers Avg Quality 2/10

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python map function

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# 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]

Popularity 10/10 Helpfulness 4/10 Language python

Source: Grepper

Tags: map-function map-functi

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Contributed on Jan 30 2022

Dark Dotterel

0 Answers Avg Quality 2/10

map example in python

Comments(1)

# 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']]

Popularity 10/10 Helpfulness 3/10 Language python

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Contributed on Aug 12 2022

Lucifer

0 Answers Avg Quality 2/10

map function in python

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# 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))

Popularity 10/10 Helpfulness 3/10 Language python

Source: Grepper

Tags: map-function map-functi

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Contributed on May 11 2020

Bright Butterfly

0 Answers Avg Quality 2/10

pyhton map

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def calculateSquare(n):
    return n*n


numbers = (1, 2, 3, 4)
result = map(calculateSquare, numbers)
print(result)

# converting map object to set
numbersSquare = list(result)
print(numbersSquare)

Popularity 10/10 Helpfulness 3/10 Language python

Source: www.programiz.com

Tags: map

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Contributed on Jul 12 2020

Bugs Bunny

0 Answers Avg Quality 2/10

How to use map in Python?

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#Methodmap will make your code more readable
#We multiply all the values in the list by two
numbers=[1, 2, 3, 4, 5, 6, 7, 8, 9, 10]
print(list(map(lambda num: num*2, numbers)))

#If you run the code, you will see that you were able to do this without using a loop
#GOOD LUCK

Popularity 9/10 Helpfulness 2/10 Language python

Source: Grepper

Tags: map

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Contributed on Jun 09 2023

Mohammad Sadati

0 Answers Avg Quality 2/10

Python Map function

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# 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]

Popularity 10/10 Helpfulness 2/10 Language python

Source: thetechbrainer.com

Tags: map-function map-functi

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Contributed on May 04 2021

BodeN'Cug

0 Answers Avg Quality 2/10

map in python

Comment

#Syntax
map(functions, iterables)

Popularity 10/10 Helpfulness 2/10 Language python

Source: Grepper

Tags: map

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Contributed on Jul 17 2020

san_bt

0 Answers Avg Quality 2/10

map in python

Comment

# 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]

Popularity 10/10 Helpfulness 2/10 Language python

Source: Grepper

Tags: map

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Contributed on Jun 05 2020

Grumpy Gull

0 Answers Avg Quality 2/10

map in python

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map(function_to_apply, list_of_inputs)

Popularity 10/10 Helpfulness 2/10 Language python

Source: Grepper

Tags: map

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Contributed on Oct 20 2020

Delta Sierra

0 Answers Avg Quality 2/10

map python

Comment

#### Core python use case #####
#map(func_name, some_list)

items = [1, 2, 3, 4]
list(map(lambda x: x + 2 , items))  ## [3, 4, 5, 6]
#### Dataframe Application #####
# Method 1
df["col"].apply(lambda x: x+1)
# Method 2
genders = {'James': 'Male', 'Jane': 'Female'}
df['gender'] = df['name'].map(genders)

Popularity 9/10 Helpfulness 2/10 Language python

Source: Grepper

Tags: map

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Contributed on Feb 01 2023

Innocent Iguana

0 Answers Avg Quality 2/10

map python

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