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🖥️ ADD and UPDATE Values from a List in Python (Append, Extend, Insert)
○ Add items into a List in Python
Adding items into a List in Python or updating items from a List in Python is very easy. Lists are mutable, which means their elements can be changed. In fact, you can add one item into a list using the method append(), or add several items at once using method extend().
To add new values into a list in Python, use the method append(). This method adds items only to the end of the list.
my_list = ['red', 'green', 'blue']
my_list.append('yellow')
# my_list = ['red', 'green', 'blue', 'yellow']Furthermore, you can insert one item at a desired location, by using the method insert() in Python. If you want to insert an item at a specific position in a list, you will use the insert() method. Note that: All of the values in the list after the inserted value will be moved down one index.
my_list = ['red', 'green', 'blue']
my_list.insert(1, 'yellow')
# my_list = ['red', 'yellow', 'green', 'blue'] ○ Update items from a List in Python
Updating an entry to an existing list is simply a matter of assigning a new value, with the assignment operator (=). Thus, you can replace an existing element with its new value, by assigning the new value to the desired index. Note that: List indexing in Python is zero-based, as it is with strings.
my_list = ['red', 'green', 'blue']
my_list[0] = 'yellow'
# my_list = ['yellow', 'green', 'blue']
my_list[-1] = 'orange'
# my_list = ['yellow', 'green', 'orange']Let’s play this video, stick around and watch until the end of this video! 👍🏻
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