Related Articles

Related Articles

Python – Generate random number except K in list
  • Last Updated : 06 Mar, 2020

Sometimes, while working with python, we can have a problem in which we need to generate random number. This seems quite easy but sometimes we require a slight variation of it. That is, we require to generate random number from a list except K. Lets discuss certain ways in which this task can be performed.

Method #1 : Using choice() + list comprehension
The combination of above functions can be used to perform this task. In this, we first filter out the numbers except K using list comprehension and then feed that list to choice() for random number generation.

filter_none

edit
close

play_arrow

link
brightness_4
code

# Python3 code to demonstrate 
# Generate random number except K in list
# using choice() + list comprehension
import random
  
# Initializing list 
test_list = [4, 7, 8, 4, 6, 10]
  
# printing original list
print("The original list is : " + str(test_list))
  
# Initializing K 
K = 4
  
# Generate random number except K in list
# using choice() + list comprehension
res = random.choice([ele for ele in test_list if ele != K])
  
# printing result 
print ("The random number except K is : " + str(res))

chevron_right


Output :

The original list is : [4, 7, 8, 4, 6, 10]
The random number except K is : 8

 

Method #2 : Using filter() + lambda + choice()
This is yet another way in which this task can be performed. In this, we perform method of creating new list using filter and lambda.



filter_none

edit
close

play_arrow

link
brightness_4
code

# Python3 code to demonstrate 
# Generate random number except K in list
# using choice() + filter() + lambda
import random
  
# Initializing list 
test_list = [4, 7, 8, 4, 6, 10]
  
# printing original list
print("The original list is : " + str(test_list))
  
# Initializing K 
K = 4
  
# Generate random number except K in list
# using choice() + filter() + lambda
res = random.choice(list(filter(lambda ele: ele != K, test_list)))
  
# printing result 
print ("The random number except K is : " + str(res))

chevron_right


Output :

The original list is : [4, 7, 8, 4, 6, 10]
The random number except K is : 8

Attention geek! Strengthen your foundations with the Python Programming Foundation Course and learn the basics.

To begin with, your interview preparations Enhance your Data Structures concepts with the Python DS Course.




My Personal Notes arrow_drop_up
Recommended Articles
Page :