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      Sort Arrays

      Python Tutorial

      This Python tutorial has been written for the beginners to help them understand the basic to advanced concepts of Python Programming Language. After completing this tutorial, you will find yourself at a great level of expertise in Python, from where you can take yourself to the next levels to become a world class Software Engineer.

      Sort Arrays

      Python's array module defines the array class. An object of array class is similar to the array as present in Java or C/C++. Unlike the built-in Python sequences, array is a homogenous collection of either strings, or integers, or float objects.
      The array class doesn't have any function/method to give a sorted arrangement of its elements. However, we can achieve it with one of the following approaches
      Using a sorting algorithm
      Using the sort() method from List
      Using the built-in sorted() function
      Let's discuss each of these methods in detail.

      Using a Sorting Algorithm

      We shall implement the classical bubble sort algorithm to obtain the sorted array. To do it, we use two nested loops and swap the elements for rearranging in sorted order.
      Save the following code using a Python code editor
      import array as arr
      a = arr.array('i', [10,5,15,4,6,20,9])
      for i in range(0, len(a)):
         for j in range(i+1, len(a)):
            if(a[i] > a[j]):
               temp = a[i];
               a[i] = a[j];
               a[j] = temp;
      print (a)
      It will produce the following output 
      array('i', [4, 5, 6, 9, 10, 15, 20])

      Using the sort() Method from List

      Even though array doesn't have a sort() method, Python's built-in List class does have a sort method. We shall use it in the next example.
      First, declare an array and obtain a list object from it, using tolist() method −
      a = arr.array('i', [10,5,15,4,6,20,9])
      b=a.tolist()
      We can easily obtain the sorted list as follows 
      b.sort()
      All we need to do is to convert this list back to an array object
      a.fromlist(b)
      Here is the complete code
      from array import array as arr
      a = arr.array('i', [10,5,15,4,6,20,9])
      b=a.tolist()
      b.sort()
      a = arr.array('i')
      a.fromlist(b)
      print (a)
      It will produce the following output 
      array('i', [4, 5, 6, 9, 10, 15, 20])

      Using the Builtin sorted() Function

      The third technique to sort an array is with the sorted() function, which is a built-in function.
      The syntax of sorted() function is as follows
      sorted(iterable, reverse=False)
      The function returns a new list containing all items from the iterable in ascending order. Set reverse parameter to True to get a descending order of items.
      The sorted() function can be used along with any iterable. Python array is an iterable as it is an indexed collection. Hence, an array can be used as a parameter to sorted() function.
      from array import array as arr
      a = arr.array('i', [4, 5, 6, 9, 10, 15, 20])
      sorted(a)
      print (a)
      It will produce the following output
      array('i', [4, 5, 6, 9, 10, 15, 20])

      Practice with Online Editor

      Note: This Python online Editor is a Python interpreter written in Rust, RustPython may not fully support all Python standard libraries and third-party libraries yet.
      Remember to save code(Ctrl + S Or Command + S) before run it.