“how to add an element to the beginning of a list in python” Code Answer’s append to front of list python
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Using list methods to add data: append() vs. extend() The .append() method increases the length of the list by one, so if you want to add only one element to the list, you can use this method.
x = [1, 2, 3]
x.append(4)
x
[1, 2, 3, 4]
The .extend() method increases the length of the list by the number of elements that are provided to the method, so if you want to add multiple elements to the list, you can use this method.
x = [1, 2, 3]
x.extend([4, 5])
x
[1, 2, 3, 4, 5]
Interactive example of the append() and extend() methods We start with the list names:
names = ['Apple Inc', 'Coca-Cola', 'Walmart']
# Append a name to the list names
names.append('Amazon.com')
print(names)
When we run the above code, it produces the following result:
names = ['Apple Inc', 'Coca-Cola', 'Walmart', 'Amazon.com']
We can then add two additional elements to the list names using extend() and the more_elements list.
# Extend list names
more_elements = ['DowDuPont', 'Alphabet Inc']
names.extend(more_elements)
print(names)
When we run the above code, it produces the following result:
['Apple Inc', 'Coca-Cola', 'Walmart', 'Amazon.com', 'DowDuPont', 'Alphabet Inc']
Try it for yourself.
To learn more about list methods and functions, please see this video from our course Introduction to Python for Finance.
This content is taken from DataCamp’s Introduction to Python for Finance course by Adina Howe.
Python - Add List Items
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Append Items
To add an item to the end of the list, use the append()
method:
Example
Using the append() method to append an item:
thislist = ["apple", "banana", "cherry"]
Try it Yourself »
Inserting an element in list at specific index using list.insert() In python list provides a member function insert() i.e.
list.insert(position, element)
It accepts a position and an element and inserts the element at given position in the list.
Let’s see an example,
Suppose we have a list of strings i.e.
# List of string
list1 = ['Hi' , 'hello', 'at', 'this', 'there', 'from']
Now let insert ‘why’ at 3rd position in the list i.e.
# Add an element at 3rd position in the list
list1.insert(3, 'why')
Index will start from 0 in list. So, element will be inserted at 3rd position i.e. after 0,1 & 2.
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So, list contents will be now,
['Hi', 'hello', 'at', 'why', 'this', 'there', 'from']
Python List append() In this tutorial, we will learn about the Python list append() method with the help of examples.
The append() method adds an item to the end of the list.
Example currencies = ['Dollar', 'Euro', 'Pound']
# append 'Yen' to the list
currencies.append('Yen')
print(currencies)
# Output: ['Dollar', 'Euro', 'Pound', 'Yen']
How to append element in the list Python provides built-in methods to append or add elements to the list. We can also append a list into another list. These methods are given below.
append(elmt) - It appends the value at the end of the list.insert(index, elmt) - It inserts the value at the specified index position.extends(iterable) - It extends the list by adding the iterable object.Let's understand these methods by the following example.
1. append(elmt) This function is used to add the element at the end of the list. The example is given below.
Example -
Output:
Current names List is: ['Joseph', 'Peter', 'Cook', 'Tim']
Please enter a name:
Devansh
Updated name List is: ['Joseph', 'Peter', 'Cook', 'Tim', 'Devansh']
2. insert(index, elmt) The insert() function adds the elements at the given an index position. It is beneficial when we want to insert element at a specific position. The example is given below.
Example -
Output:
Current Numbers List: [10, 20, 30, 40, 50]
The new list is: [10, 20, 30, 77, 40, 50]
enter a number to add to list:
45
enter the index to add the number:
1
Updated Numbers List: [10, 45, 20, 30, 77, 40, 50]
3. extend(iterable) The extends() function is used to add the iterable elements to the list. It accepts iterable object as an argument. Below is the example of adding iterable element.
Example -
Output:
[10, 20, 30, '52.10', '43.12']
[10, 20, 30, '52.10', '43.12', 40, 30]
[10, 20, 30, '52.10', '43.12', 40, 30, 'A', 'p', 'p', 'l', 'e']
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How to Add Elements to a List in Python (append, extend and insert) Posted Jun 11, 2020
• 3 min read
The Python list data type has three methods for adding elements:
append() - appends a single element to the list. extend() - appends elements of an iterable to the list. insert() - inserts a single item at a given position of the list. All three methods modify the list in place and return None.
