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Find the error in the following statements:

```python
L1 = [7, 2, 3, 4]
L2 = L1 + 2
L3 = L1 * 2
L = L1.pop(7)
```

Identify which statement(s) contain an error:

Statement 1
Statement 2
Statement 3
Statement 4

Answer :

The question seems to be related to Python programming and involves identifying errors in the given code snippets involving list operations. Let's examine each statement step-by-step to find the errors:

  1. Statement 1:

    • L1 = [7, 2, 3, 4]
    • This is a correct Python statement. It initializes a list L1 with the elements 7, 2, 3, and 4.

  2. Statement 2:

    • L2 = L1 + 2
    • Error: This statement is incorrect. In Python, you cannot directly add an integer to a list. Lists can be concatenated using the + operator only with another list, not an integer.
    • Correct way: If you want to add the integer 2 to each element in the list, you could use a list comprehension: L2 = [x + 2 for x in L1].

  3. Statement 3:

    • L3 = L1 * 2
    • This statement is correct. It multiplies the list L1 by 2, which results in a new list where the sequence of elements in L1 is repeated twice. For example, it would become [7, 2, 3, 4, 7, 2, 3, 4].

  4. Statement 4:

    • L = L1.pop(7)
    • Error: The pop() method is intended to remove and return an item at the specified index. The index 7 is out of range for L1, which only has 4 elements (0 to 3). Attempting to pop an element at an invalid index will result in an IndexError.
    • Correct way: If you want to remove a specific value, you might consider using L1.remove(7) if you aim to remove the element '7'.

In summary, statements 2 and 4 contain errors related to invalid operations on lists. These errors are common mistakes when dealing with lists in Python and learning the correct usage of operations like list concatenation and element removal is essential for effective programming.

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