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Extend() in Python

The extend() method in Python is one of the most popular list manipulation methods used by Python developers. It allows you to add multiple elements from another list, tuple, set, or iterable to the end of an existing list. Unlike append(), which adds a single item as one element, the extend() method adds each element individually — making it ideal for merging lists or expanding data dynamically.

🔹 Syntax:

list1.extend(iterable)

🔹 Parameters:

iterable: Any sequence such as a list, tuple, set, or string that you want to add to the list.
🔹 Example:

fruits = ["apple", "banana"]
more_fruits = ["mango", "orange"]

fruits.extend(more_fruits)
print(fruits)

Output:

['apple', 'banana', 'mango', 'orange']

🔹 Key Features:

✅ Modifies the list in-place (no new list is created).
✅ Efficient way to merge lists in Python.
✅ Works with any iterable data type.
✅ Commonly used in data processing, automation, and Python programming tutorials.

🔹 Real-Life Use Case:

You can use extend() to combine datasets, append API results, or build lists dynamically in projects using Flask, Django, or Data Science pipelines.

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