The .extend() method is used to add multiple elements to the end of a list. It unpacks the given iterable (like a list, tuple, or set) and appends each element individually.

📌 Syntax:

list1.extend(iterable)

• list1: The original list.

• iterable: A sequence (like list, tuple, set, etc.) whose elements will be added.

✅ Example:

myCart = ['python', 'agentic']
myCart.extend(['langgraph', 'vector_db'])

print(myCart)

Output:

['python', 'agentic', 'langgraph', 'vector_db']

Notice: it added each element from the second list individually (not as a sublist).

🔁 Difference from append():

💡 Works with any iterable:

myCart.extend(('js', 'react'))  # tuple
myCart.extend({'ml', 'ai'})     # set (order not guaranteed)

🛑 Caution:

• .extend() modifies the original list. It does not return a new list.

• It raises TypeError if a non-iterable is passed (e.g., myCart.extend(123) is invalid).