Sure, let's figure out how to identify the index of the element 7 in our list [tex]\( \text{myList} = [12, 5, 7, 3, 25] \)[/tex].
1. Understand the Problem: We need to determine the position of the number 7 within our list. Lists in Python are indexed starting from 0, meaning the first element is at index 0, the second element is at index 1, and so forth.
2. Identify the Required Function: We require a function that scans through the list and returns the index position where a specified element is located.
3. Name of the Function: The function that performs this task is called `index`. This function searches the list for the specified value and returns the first position where it is found.
4. Apply the Function: Use the `index` function with the value 7 on `myList`.
So, the correct function to find the position of 7 in the list [tex]\( \text{myList} \)[/tex] should be:
[tex]\[ \text{myList.index}(7) \][/tex]
5. Resulting Index: Given that the element 7 is present in the list, the `index` function will return the position where it first appears. Checking the positions, the list is arranged as follows:
- 12 (index 0)
- 5 (index 1)
- 7 (index 2)
- 3 (index 3)
- 25 (index 4)
Hence, the index of the element 7 in the list is at position 2.
So, the complete expression to return the index of 7 is:
[tex]\[ \text{myList.index}(7) \][/tex]
And it evaluates to:
[tex]\[ 2 \][/tex]
