Reversing Arrays in Python: Inverting Element Order

In this chapter, we shall explore the different ways to rearrange the given array in the reverse order of the index. In Python, array is not one of the built-in data types. However, Python's standard library has array module. The array class helps us to create a homogenous collection of string, integer or float types.

The syntax used for creating array is −

Let us first create an array consisting of a few objects of int type −

The array class doesn't have any built-in method to reverse array. Hence, we have to use another array. An empty array "b" is declared as follows −

Next, we traverse the numbers in array "a" in reverse order, and append each element to the "b" array −

The array "b" now holds numbers from original array in reverse order.

Example 1

Here is the complete code to reverse an array in Python −

It will produce the following output −

array('i', [10, 5, 15, 4, 6, 20, 9]) array('i', [9, 20, 6, 4, 15, 5, 10])

We can also reverse the sequence of numbers in an array using the reverse() method in list class. List is a built-in type in Python.

We have to first transfer the contents of an array to a list with tolist() method of array class −

We can call the reverse() method now −

If we now convert the list back to an array, we get the array with reversed order,

Example 2

Here is the complete code −

It will produce the following output −

array('i', [10, 5, 15, 4, 6, 20, 9])


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