Add 2 list Python 2021

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Nội dung chính Methods to add elements to List in Python Python add elements to List Examples 1. append() 2. insert() 3. extend() 4. List Concatenation Video tương quan In this tutorial, we will learn different ways to add elements to a List in Python. Methods to add elements to List in Python There are four methods to add elements to a List in Python. append(): append the object to the end of the list. insert(): inserts the object before the given index. extend(): extends the list by appending elements from the iterable. List Concatenation: We can use + operator to concatenate multiple lists and create a new list. Python add elements to List Examples We can add an element to the end of the list or at any given index. There are ways to add elements from an iterable to the list. We can also use + operator to concatenate multiple lists to create a new list. 1. append() This function add the element to the end of the list. fruits = [“Apple”, “Banana”] # 1. append() print(f’Current Fruits List fruits’) f = input(“Please enter a fruit name:n”) fruits.append(f) print(f’Updated Fruits List fruits’) Output: Current Fruits List [‘Apple’, ‘Banana’] Please enter a fruit name: Orange Updated Fruits List [‘Apple’, ‘Banana’, ‘Orange’] 2. insert() This function adds an element at the given index of the list. Its useful to add an element at the specified index of the list. num_list = [1, 2, 3, 4, 5] print(f’Current Numbers List num_list’) num = int(input(“Please enter a number to add to list:n”)) index = int(input(f’Please enter the index between 0 and len(num_list) – 1 to add the number:n’)) num_list.insert(index, num) print(f’Updated Numbers List num_list’) Output: Current Numbers List [1, 2, 3, 4, 5] Please enter a number to add to list: 20 Please enter the index between 0 and 4 to add the number: 2 Updated Numbers List [1, 2, 20, 3, 4, 5] 3. extend() This function append iterable elements to the list. It is useful to append elements from an iterable to the end of the list. list_num = [] list_num.extend([1, 2]) # extending list elements print(list_num) list_num.extend((3, 4)) # extending tuple elements print(list_num) list_num.extend(“ABC”) # extending string elements print(list_num) Output: [1, 2] [1, 2, 3, 4] [1, 2, 3, 4, ‘A’, ‘B’, ‘C’] 4. List Concatenation If you have to concatenate multiple lists, you can use the + operator. This will create a new list and the original lists will remain unchanged. evens = [2, 4, 6] odds = [1, 3, 5] nums = odds + evens print(nums) # [1, 3, 5, 2, 4, 6] The new list will contain elements from the list from left to right. Its similar to the string concatenation in Python. Conclusion Its very easy to add elements to a List in Python programming. We can append an element at the end of the list, insert an element at the given index. We can also add a list to another list. If you want to concatenate multiple lists, then use the overloaded + operator. References: Python List Python.org Docs Video tương quan

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