Differentiate between append() and extend() functions of list.

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Differentiate between append() and extend() functions of list.

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The append() and extend() functions in Python lists serve different purposes:

  1. append():

    • Purpose: Adds a single element to the end of the list.

    • Effect: The added element can be of any data type, including another list.

    • Example:

      list1 = [1, 2, 3]
list1.append(4)
# Output: [1, 2, 3, 4]
list1.append([5, 6])
# Output: [1, 2, 3, 4, [5, 6]]

  2. extend():

    • Purpose: Adds each element of an iterable (e.g., list, tuple) to the end of the list.

    • Effect: The elements of the iterable are added individually.

    • Example:

      list1 = [1, 2, 3]
list2 = [4, 5, 6]
list1.extend(list2)
# Output: [1, 2, 3, 4, 5, 6]

In summary, append() adds its argument as a single element to the list, while extend() iterates over its argument adding each element individually to the list.

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