How can I reverse a list in Python?

Question

How can I do the following in Python? array = [0, 10, 20, 40] for (i = array.length() - 1; i >= 0; i--)I need to have the elements of an array, but from the end to the beginning.

Answer 1

You can create a new array use a for loop to add each element from the original array to the new array. 

array = [0, 10, 20, 40]

reverse = []

for i in range(len(array) - 1, -1, -1):

reverse.append(array[i])

In Python you can use the range method to give you a list of numbers from a starting point to an end point. 

This is the format of the range method. range(start, stop, step).

From code above: range(len(array) - 1, -1, -1) --> 3, 2, 1, 0

In this case you are starting from the last index (length of array minus 1) to the first index. The step is -1 because of this. Another thing about range is that the stop number is not included if 0 was used instead of -1 the first element would not have been added to the array.