Remove list elements larger than a specific value using Python

In this article, we will learn how to remove elements larger than a specific value from a list in Python.

Methods Used

The following are the various methods used to accomplish this task −

• Using remove() Method

• Using List Comprehension

• Using the filter() method & lambda function

Method 1: Using remove() Method

remove() function(removes the first occurrence of the element from the list)

Algorithm (Steps)

Following are the Algorithms/steps to be followed to perform the desired task. −

• Create a variable to store the input list.

• Create another variable to store another input value.

• Use the for loop to iterate through each element in an input list.

• Use the if conditional statement, to check whether the current element is greater than the specified input value.

• Use the to remove() function to remove that current element from the list if the condition is true by passing it as an argument to it.

• Print the resultant list after removing elements larger than the specified input value.

Example

The following program removes elements larger than the specified input value from the list using the remove() function −

# input list
inputList = [45, 150, 20, 90, 15, 55, 12, 75]
# Printing the given list
print("The Given list is:", inputList)
# input value
inputValue = 50
# iterarting through the list
for i in inputList:
   # checking whether the current element is greater than the input value
   if i > inputValue:
      # removing that current element from the list if the condition is true
      inputList.remove(i)
# printing the resultant list after removing elements larger than 50
print("Removing elements larger than 50 from the list:\n", inputList)

Output

On execution, the above program will generate the following output −

The Given list is: [45, 150, 20, 90, 15, 55, 12, 75]
Removing elements larger than 50 from the list:
 [45, 20, 15, 12]

Method 2: Using List Comprehension

List Comprehension

When you wish to build a new list based on the values of an existing list, list comprehension provides a shorter/concise syntax.

Example

The following program removes elements larger than the specified input value from the input list using list comprehension −

# input list
inputList = [45, 150, 20, 90, 15, 55, 12, 75]
# Printing the given list
print("The Given list is:", inputList)

# input value
inputValue = 50

# removing elements from a list larger than 50
# by traversing through the list and storing elements
# that are having a value less than or equal to the given input value
resultList = [k for k in inputList if k <= inputValue]

# printing the resultant list
print("Removing elements larger than 50 from the list:", resultList)

Output

On execution, the above program will generate the following output −

The Given list is: [45, 150, 20, 90, 15, 55, 12, 75]
Removing elements larger than 50 from the list: [45, 20, 15, 12]

Method 3: Using the filter() method & lambda function

Lambda Function

Lambda Function, often known as an 'Anonymous Function,' is the same as a normal Python function except that it can be defined without a name. The def keyword is used to define normal functions, while the lambda keyword is used to define anonymous functions. They are, however, limited to a single line of expression. They, like regular functions, can accept several parameters.

Syntax

lambda arguments: expression

• This function accepts any number of inputs but only evaluates and returns one expression.

• Lambda functions can be used wherever function objects are necessary.

• You must remember that lambda functions are syntactically limited to a single expression.

Algorithm (Steps)

Following are the Algorithms/steps to be followed to perform the desired task. −

• Check each element of the iterable using the lambda function.

• Filter all the elements that are having a value less than the given input value using the filter() function.

• filter() function − filters the specified sequence using a function that determines if each element in the sequence is true or false.

• Convert this filter object to a list using the list() function.

• Print the resultant list after removing elements larger than the specified input value.

Example

The following program removes elements larger than the specified input value from the input list using filter() and lambda() functions &miinus;

# input list
inputList = [45, 150, 20, 90, 15, 55, 12, 75]
print("The Given list is:", inputList)
# input value
inputValue = 50

# Filtering list objects that are having value
# less than or equal to the given input Value
filteredObject = filter(lambda k: k <= inputValue, inputList)

# Convert the filter object to a list using the list() function
resultList = list(filteredObject)

# printing the resultant list after removing elements larger than 50
print("Removing elements larger than 50 from the list:\n", resultList)

Output

On execution, the above program will generate the following output −

The Given list is: [45, 150, 20, 90, 15, 55, 12, 75]
Removing elements larger than 50 from the list:
 [45, 20, 15, 12]

Method 4: Using the for loop and append() function

Example

The following program removes elements larger than the specified input value from the input list using for loop and append() function −

# input list
inputList = [45, 150, 20, 90, 15, 55, 12, 75]
print("The Given list is:", inputList)
# input value
inputValue = 50
# Creating an empty list to store the result
resultList = []
# iterarting through the list
for i in inputList:
   # checking whether the current element is less than or equal to the input value
   if i <= inputValue:
      # add this element to the result list
      resultList.append(i)
# printing the resultant list after removing elements larger than 50
print("Removing elements larger than 50 from the list:\n", resultList)

Output

On execution, the above program will generate the following output −

The Given list is: [45, 150, 20, 90, 15, 55, 12, 75]
Removing elements larger than 50 from the list:
 [45, 20, 15, 12]

Conclusion

In this article, we learned 4 different Python methods for removing list elements that are larger than a given value. Additionally, we learned how to use the lambda and filter() functions to filter the list based on the condition.