Python list remove and return first element

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Python list remove and return first element

This post will discuss how to remove the first item from a list in Python. 1. Using list.pop() function The simplest approach is to use the list¡¯s pop([i]) function, which removes and returns an item present at the specified position in the list. if __name__ == '__main__': Download Run Code The pop([i]) function raises an IndexError if the list is empty as

it tries to pop from an empty list. Another approach is to use the list¡¯s remove(x) function, which removes the first item from the list, which matches the specified value. The idea is to pass the value of the list¡¯s first item to it, as shown below: if __name__ == '__main__': Download Run Code The remove() function raises an IndexError if the list is

empty since it tries to access the list¡¯s index, which is out of range. 3. Using Slicing We know that we can slice lists in Python. We can use slicing to remove the first item from a list. The idea is to obtain a sublist containing all items of the list except the first one. Since slice operation returns a new list, we have to assign the new list to the original list.

This can be done using the expression l = l[1:], where l is your list. if __name__ == '__main__': Download Run Code Note that this function doesn¡¯t raise any error on an empty list but constructs a copy of the list, which is not recommended. 4. Using del statement Another way to remove an item from a list using its index is the del statement. It differs

from the pop() function as it does not return the removed item. Unlike the slicing function, this doesn¡¯t create a new list but modifies your original list. if __name__ == '__main__': Download Run Code The above code raises an IndexError if the list is empty since it tries to access index 0 of the list, which is out of range. That¡¯s all about removing the

first item from a list in Python. Thanks for reading. Please use our online compiler to post code in comments using C, C++, Java, Python, JavaScript, C#, PHP, and many more popular programming languages. Like us? Refer us to your friends and help us grow. Happy coding Queue data structure is very well known data structure, lists in Python

usually appends the elements to the end of the list. For implementing a queue data structure, it is essential to be able to remove the front element from a list.Let¡¯s discuss the ways of removing first element of the list.Method #1 : Using pop(0)This method pops, i.e removes and prints the i¡¯th element from the list. This method is mostly used among the

other available options to perform this task. This changes the original list.test_list = [1, 4, 3, 6, 7]print ("Original list is : " + str(test_list))test_list.pop(0)print ("Modified list is : " + str(test_list))Output : Original list is : [1, 4, 3, 6, 7] Modified list is : [4, 3, 6, 7] Method #2 : Using del list[0]This is just the alternate method to perform the front deletion,

this method also performs the removal of list element in place and decreases the size of list by 1.test_list = [1, 4, 3, 6, 7]print ("Original list is : " + str(test_list))del test_list[0]print ("Modified list is : " + str(test_list))Output : Original list is : [1, 4, 3, 6, 7] Modified list is : [4, 3, 6, 7] Method #3 : Using SlicingSlicing is another approach by which this

problem can be solved, we can slice the list from second element till last and assign to the empty list. This does not do the inplace conversion as in case of above two methods.test_list = [1, 4, 3, 6, 7]print ("Original list is : " + str(test_list))res = test_list[1:]print ("Modified list is : " + str(res))Output : Original list is : [1, 4, 3, 6, 7] Modified list is : [4, 3,

6, 7] Method #4 : Using deque() + popleft()This is lesser known method to achieve this particular task, converting the list into deque and then performing the popleft, removes the element from the front of the list.from collections import dequetest_list = [1, 4, 3, 6, 7]print ("Original list is : " + str(test_list))res = deque(test_list)res.popleft()print

("Modified list is : " + str(list(res)))Output : Original list is : [1, 4, 3, 6, 7] Modified list is : [4, 3, 6, 7] Python lists are one of the most used sequential data structures when it comes to storing and manipulating data easily while programming. Lists are one collection that simplifies the life of programmers to a great extent. However, when it comes to

removing items from lists, there are multiple ways in which this can be done. Removing elements is not just a matter of removing a value from a list, but also of making sure that the other elements in the list remain valid. In this article, we will take a look at five different ways that you can use to remove the first element from the lists. But before that,

let us take a brief look at the list of data structures in python programming. What are Lists in Python? A list is a Python data structure that can be used to represent a collection of data elements to organize data while programming. They are ordered and mutable. This means that you can add new items to the list, remove items one-by-one, and

rearrange items according to the order in which they appear. Listing elements with commas between them inside the square brackets([]) is a convenient way to organize data while using a list data structure. To learn more about lists in Python, refer to our article ¡°3 Ways to Convert List to Tuple in Python¡±. For Example sample_list = ["favtutor", 1,

2.30] print(sample_list) Output How to Remove First Element from a List in Python? Below are the 5 common methods by which you can remove the first element of any given list in python: 1) Using pop() The pop() method is one of the list object method used to remove an element from the list and returns it. While using the pop() method, you have

to specify the index value of the element in the list as an argument and return the popped out element as the desired output. As we wish to remove the first element of the list here, we pass ¡°0¡± as the parameter inside the method. If the particular element to be removed is not present in the list, then the error ¡°IndexError¡± will be raised. Check out the

below example to understand the working of the pop() method and remove the desired element from the list. For Example sample_list = [1, 2, 3, 4, 5] a = sample_list.pop(0) print(sample_list) Output 2) Using remove() method The remove () method is one of the most common methods used to remove and return the list element. Unlike the pop()

method, when you make use of the remove() method, you have to specify the particular element to be removed as a method parameter. If the element is repeated inside the list, then the first occurrence of the element will be removed. At the same time, if the element is not found in the list, then the error ¡°ValueError¡± will be returned. Below example

shows the working of the remove() method in detail: For Example sample_list = [1, 2, 3, 4, 5] sample_list.remove(sample_list[0]) print(sample_list) Output 3) Using del operator Del operator has similar working as pop() method to remove the elements from the lists in python. The del operator removes the element from the list at a specified index

location but does not return the removed item, unlike the pop() method. So the operator takes the element to be removed as the argument and deletes it from the given list. The main advantage of this element is that it supports removing more than one element at a time from the list. The program will return the ¡°IndexError¡± as output when the index

of the element is out of range. For Example sample_list = [1, 2, 3, 4, 5] del sample_list[0] print(sample_list) Output 4) Using slicing method Slicing is one of the techniques used in python programming to manipulate strings and lists as data structures. We can use the slicing technique to slice the list from the second element and separate it from the

first element. Later, you can return this element as the output as shown in the below example. Remember that this method does not inplace the removal of elements like the above methods. For Example sample_list = [1, 2, 3, 4, 5] sample_list = sample_list[1:] print(sample_list) Output 5) Using deque() method This is the least used method to remove

the elements from the given list in python programming. In this method, we convert the list into the deque and then use the popleft() method which helps to return the first element from the front of the list. Remember that to implement this method, you have to import the deque at the beginning of the program using the ¡°import¡± keyword. Check out

the below example to understand the working of deque in detail. For Example from collections import deque sample_list = [1,2,3,4,5] queue = deque(sample_list) queue.popleft() sample_list = list(queue) print(sample_list) Output Conclusion As lists are the most used data structure while programming in python, there are times when you wish to add,

update, or remove certain specified elements from the list. Updating these changes manually after completing the entire program is feasibly impossible. Therefore, we have mentioned the 5 most common and popular methods to remove the first element from the list in python. You can make use of any of these methods according to your preference,

however, the remove() method is most recommended by the experts. For more such technical knowledge, check out our blogs on different programming languages.

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