Remove Multiple Elements from List in Python
Last Updated :
26 Dec, 2024
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In this article, we will explore various methods to remove multiple elements from a list in Python. The simplest way to do this is by using a loop. A simple for loop can also be used to remove multiple elements from a list.
a = [10, 20, 30, 40, 50, 60, 70]
# Elements to remove
remove = [20, 40, 60]
# Remove elements using a simple for loop
res = []
for val in a:
if val not in remove:
res.append(val)
print(res)
Output
[10, 30, 50, 70]
Explanation
- Iterate through each element in the original list a and adding it to result if it’s not in remove list.
Let’s explore other different ways to remove multiple elements from list:
Using List Comprehension
List comprehension is one of the most concise and efficient ways to remove multiple elements from a list.
a = [10, 20, 30, 40, 50, 60, 70]
# Elements to remove
remove = [20, 40, 60]
# Remove elements using list comprehension
a = [x for x in a if x not in remove]
print(a)
Output
[10, 30, 50, 70]
Explanation:
- Iterate over each element in a and checking if it is not in remove list.
- Elements not in remove list are included in the new list.
Using remove() in a Loop
remove() method removes the first occurrence of a specified element from the list. To remove multiple elements, we can use a loop to repeatedly call remove().
a = [10, 20, 30, 40, 50, 60, 70]
# Elements to remove
remove = [20, 40, 60]
# Remove elements using remove() in a loop
for val in remove:
while val in a:
a.remove(val)
print(a)
Output
[10, 30, 50, 70]
Explanation:
- We iterate over each element in remove list.
- The while loop make sure that all occurrences of each element are removed from the list.
Using filter() Function
filter() function can be used to remove elements from a list by providing a filtering condition and typically through a lambda function.
a = [10, 20, 30, 40, 50, 60, 70]
# Elements to remove
remove = {20, 40, 60}
# Remove elements using filter
a = list(filter(lambda x: x not in remove, a))
print(a)
Output
[10, 30, 50, 70]
Explanation:
- filter() function iterates over the list a and applying the lambda function.
- If an element is not in remove list then include it in the filtered list.
