# Python – Custom Lower bound a List

• Last Updated : 11 Oct, 2020

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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