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Python – Custom Lower bound a List

  • Last Updated : 11 Oct, 2020
Geek Week

Given a list, assign a custom lower-bound value to it.

Input : test_list = [5, 7, 8, 2, 3, 5, 1], K = 3 
Output : [5, 7, 8, 3, 3, 5, 3] 
Explanation : All elements less than 3, assigned 3.

Input : test_list = [5, 7, 8, 2, 3, 5, 1], K = 5 
Output : [5, 7, 8, 5, 5, 5, 5] 
Explanation : All elements less than 5, assigned 5. 

Method #1: Using list comprehension

In this, we check for each element if it’s lower than lower-bound, if yes, then assign the decided lower-bound to that element.



Python3




# Python3 code to demonstrate working of 
# Custom Lowerbound a List
# Using list comprehension
  
# initializing list
test_list = [5, 7, 8, 2, 3, 5, 1]
  
# printing original list
print("The original list is : " + str(test_list))
  
# initializing Lowerbound
K = 4 
  
# checking for elements and assigning Lowerbounds
res = [ele if ele >= K else K for ele in test_list]
  
# printing result 
print("List with Lowerbounds : " + str(res))
Output
The original list is : [5, 7, 8, 2, 3, 5, 1]
List with Lowerbounds : [5, 7, 8, 4, 4, 5, 4]

Method #2 : Using list comprehension + max()

In this, we perform comparison using max(), assign max of the element, or the lower-bound as decided.

Python3




# Python3 code to demonstrate working of 
# Custom Lowerbound a List
# Using list comprehension + max()
  
# initializing list
test_list = [5, 7, 8, 2, 3, 5, 1]
  
# printing original list
print("The original list is : " + str(test_list))
  
# initializing Lowerbound
K = 4 
  
# max() is used to compare for Lowerbound
res = [max(ele, K) for ele in test_list]
  
# printing result 
print("List with Lowerbounds : " + str(res))
Output
The original list is : [5, 7, 8, 2, 3, 5, 1]
List with Lowerbounds : [5, 7, 8, 4, 4, 5, 4]

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