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Recap
Iterating over a list
Modifying lists
7. Changing the order of list elements
Working with multiple lists
Congratulations

## Instruction

Good job! Another common task is to change the order of list elements. We'll show you the classic problem of reversing a list. Take a look:

sleep_durations = [368, 690, 426, 494, 445, 690, 423, 534, 606, 390]
swap_index = len(sleep_durations) - 1
for i in range(int(len(sleep_durations) / 2)):
temp_duration = sleep_durations[i]
sleep_durations[i] = sleep_durations[swap_index]
sleep_durations[swap_index] = temp_duration
swap_index -= 1
print(sleep_durations)


In each iteration, we want to perform a swap of two elements: the first element with the last, the second element with the next-to-last, etc. To make this happen, we need to find the indexes of both elements for the swap operation. One of the indexes is provided in the i variable; we also need another index, so we introduce the swap_index variable and decrease its value by 1 after each swap operation. The image below shows the consecutive loop iterations:

## Exercise

Let's do some shuffling! Change the order of elements in the monthly_spendings list by swapping pairs of neighboring elements. In other words, if the monthly_spendings list was:

[1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12]

the expected result would be:

[2, 1, 4, 3, 6, 5, 8, 7, 10, 9, 12, 11]

At the end of your code, print the modified mothly_spendings list (type print(monthly_spendings)).

### Stuck? Here's a hint!

You can create a for loop with a temporary i variable and iterate over all the indexes. If an index is even (i.e., i%2 == 0), swap the positions of list[i] and list[i+1] using a temporary variable.