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Jul 10, 2024 · Python list () function takes any iterable as a parameter and returns a list. In Python iterable is the object you can iterate over. Some examples of iterables are tuples, strings, and lists.
- Python Lists
In Python, a list is a built-in data structure that is used...
- Python Lists
Definition and Usage. The list() function creates a list object. A list object is a collection which is ordered and changeable. Read more about list in the chapter: Python Lists.
Dec 19, 2022 · Python list() function. The list() function takes an iterable construct and turns it into a list. Syntax list([iterable]) Example. In the below example, you will be working with stock price data. Let's print out an empty list, convert a tuple into a list, and finally, print a list as a list.
- Creating A List in Python
- Accessing Elements from The List
- Taking Input of A Python List
- Adding Elements to A Python List
- Reversing A List in Python
- Removing Elements from The List
- Slicing of A List
- List Comprehension
- Basic Example on Python List
- List Methods
Lists in Python can be created by just placing the sequence inside the square brackets. Unlike Sets, a list doesn’t need a built-in function for its creation of a list.
In order to access the list items refer to the index number. Use the index operator [ ] to access an item in a list. The index must be an integer. Nested lists are accessed using nested indexing. Example 1: Accessing elements from list Example 2: Accessing elements from a multi-dimensional list
We can take the input of a list of elements as string, integer, float, etc. But the default one is a string. Example 1: Output: Example 2: Output: To know more see this.
Method 1: Using append() method
Elements can be added to the List by using the built-in append()function. Only one element at a time can be added to the list by using the append() method, for the addition of multiple elements with the append() method, loops are used. Tuples can also be added to the list with the use of the append method because tuples are immutable. Unlike Sets, Lists can also be added to the existing list with the use of the append() method. Complexities for Adding elements in a Lists(append() method): Tim...
Method 2: Using insert() method
append() method only works for the addition of elements at the end of the List, for the addition of elements at the desired position, insert() method is used. Unlike append() which takes only one argument, the insert() method requires two arguments(position, value). Complexities for Adding elements in a Lists(insert() method): Time Complexity:O(n) Space Complexity:O(1)
Method 3: Using extend() method
Other than append() and insert() methods, there’s one more method for the Addition of elements, extend(), this method is used to add multiple elements at the same time at the end of the list. Complexities for Adding elements in a Lists(extend() method): Time Complexity:O(n) Space Complexity:O(1)
Method 2: Using the reversed()function:
The reversed() function returns a reverse iterator, which can be converted to a list using the list() function.
Method 1: Using remove() method
Elements can be removed from the List by using the built-in remove()function but an Error arises if the element doesn’t exist in the list. Remove() method only removes one element at a time, to remove a range of elements, the iterator is used. The remove() method removes the specified item. Example 1: Example 2: Complexities for Deleting elements in a Lists(remove() method): Time Complexity: O(n) Space Complexity:O(1)
Method 2: Using pop() method
pop() functioncan also be used to remove and return an element from the list, but by default it removes only the last element of the list, to remove an element from a specific position of the List, the index of the element is passed as an argument to the pop() method. Complexities for Deleting elements in a Lists(pop() method): Time Complexity:O(1)/O(n) (O(1) for removing the last element, O(n) for removing the first and middle elements) Space Complexity:O(1)
We can get substrings and sublists using a slice. In Python List, there are multiple ways to print the whole list with all the elements, but to print a specific range of elements from the list, we use the Slice operation. Slice operation is performed on Lists with the use of a colon(:). To print elements from beginning to a range, use: To print ele...
Python List comprehensionsare used for creating new lists from other iterables like tuples, strings, arrays, lists, etc. A list comprehension consists of brackets containing the expression, which is executed for each element along with the for loop to iterate over each element. Syntax: Example: For better understanding, the above code is similar to...
To know more refer to this article – Python List methods The operations mentioned above modify the list Itself.
- 11 min
- Create a Python List. We create a list by placing elements inside square brackets [], separated by commas. For example, # a list of three elements ages = [19, 26, 29] print(ages) # Output: [19, 26, 29]
- Access List Elements. Each element in a list is associated with a number, known as a list index. The index always starts from 0, meaning the first element of a list is at index 0, the second element is at index 1, and so on.
- Add Elements to a Python List. We use the append() method to add elements to the end of a Python list. For example, fruits = ['apple', 'banana', 'orange'] print('Original List:', fruits)
- Change List Items. We can change the items of a list by assigning new values using the = operator. For example, colors = ['Red', 'Black', 'Green'] print('Original List:', colors)
Sep 10, 2024 · The Python list is one of the most used Python data structures, together with dictionaries. The list is not just a list but can also be used as a stack or a queue. In this article, I’ll explain everything you might want to know about Python lists: how to create lists, modify them, how to sort lists,
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The Python list() constructor returns a list in Python. In this tutorial, we will learn to use list() in detail with the help of examples.
