How to Remove Element from List based on a Condition in Python

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How to Remove Element from List based on a Condition in Python ?

Answer

To remove elements from a list based on a condition in Python, you can use list comprehension or the `filter` function.

✐ Examples

1 Remove Elements Greater Than a Threshold

In this example,

We create a list named numbers with some elements.
We specify the threshold value.
We use list comprehension to create a new list containing only the elements less than or equal to the threshold.
Finally, we print the modified list to standard output.

Python Program

numbers = [1, 2, 3, 4, 5]
threshold = 3
numbers = [x for x in numbers if x <= threshold]
print('Modified list after removing elements greater than {}: {}'.format(threshold, numbers))

Output

Modified list after removing elements greater than 3: [1, 2, 3]

2 Remove Elements Matching a Predicate

In this example,

We create a list named names with some elements.
We define a predicate function is_long_name that returns True if the length of the string is greater than a specified value.
We use the filter function to filter elements based on the predicate condition.
We convert the filtered result back to a list.
Finally, we print the modified list to standard output.

Python Program

names = ['John', 'Alice', 'Michael', 'Emma']
max_length = 5
def is_long_name(name):
    return len(name) > max_length

names = list(filter(lambda x: not is_long_name(x), names))
print('Modified list after removing long names:', names)

Output

Modified list after removing long names: ['John', 'Alice', 'Emma']

Summary

In this tutorial, we learned How to Remove Element from List based on a Condition in Python language with well detailed examples.

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How to Remove Element from List based on a Condition in Python

How to Remove Element from List based on a Condition in Python ?

Answer

✐ Examples

1 Remove Elements Greater Than a Threshold

Python Program

Output

2 Remove Elements Matching a Predicate

Python Program

Output

Summary

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