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Python - Remove String from String List

Last Updated : 24 Mar, 2023
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This particular article is indeed a very useful one for Machine Learning enthusiast as it solves a good problem for them. In Machine Learning we generally encounter this issue of getting a particular string in huge amount of data and handling that sometimes becomes a tedious task. Lets discuss certain way outs to solve this problem. 

Method #1: Using remove() This particular method is quite naive and not recommended to use, but is indeed a method to perform this task. remove() generally removes the first occurrence of K string and we keep iterating this process until no K string is found in list. 

Output : 
Original list is : ['bad', 'GeeksforGeeks', 'bad', 'is', 'best', 'bad']
Modified list is : ['GeeksforGeeks', 'is', 'best']

Time Complexity: O(n), where n is the number of elements in the list “test_list”.
Auxiliary Space: O(1), constant extra space is required

Method #2: Using List Comprehension More concise and better approach to remove all the K strings, it just checks if the string is not K and re-makes the list with all strings that are not K. 

Output : 
Original list is : ['bad', 'GeeksforGeeks', 'bad', 'is', 'best', 'bad']
Modified list is : ['GeeksforGeeks', 'is', 'best']

Time Complexity: O(n)
Auxiliary Space: O(n), where n is length of list.

Method #3 : Using join(),replace(),split() and remove() methods


Output
Original list is : ['bad', 'GeeksforGeeks', 'bad', 'is', 'best', 'bad']
Modified list is : ['GeeksforGeeks', 'is', 'best']

Here's another approach to removing a string 'K' from a string list, using a filter:


Output
Original list is : ['bad', 'GeeksforGeeks', 'bad', 'is', 'best', 'bad']
Modified list is : ['GeeksforGeeks', 'is', 'best']

This approach uses the filter() function to create a filtered list of elements from test_list that are not equal to K. The list() function is then used to convert the filtered list into a list.

Time complexity: O(n), where n is the number of elements in the list test_list.

Space complexity: O(n), since a new list is created.


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