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      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 Lists

      The sort() method of list class rearranges the items in ascending or descending order with the use of lexicographical ordering mechanism. The sorting is in-place, in the sense the rearrangement takes place in the same list object, and that it doesn't return a new object.

      Syntax

      list1.sort(key, reverse)

      Parameters

      Key − The function applied to each item in the list. The return value is used to perform sort. Optional
      reverse − Boolean value. If set to True, the sort takes place in descending order. Optional

      Return value

      This method returns None.

      Example 1

      Now let's take a look at some examples to understand how we can sort lists in Python
      list1 = ['physics', 'Biology', 'chemistry', 'maths']
      print ("list before sort", list1)
      list1.sort()
      print ("list after sort : ", list1)
      
      print ("Descending sort")
      
      list2 = [10,16, 9, 24, 5]
      print ("list before sort", list2)
      list2.sort()
      print ("list after sort : ", list2)
      It will produce the following output
      list before sort ['physics', 'Biology', 'chemistry', 'maths']
      list after sort: ['Biology', 'chemistry', 'maths', 'physics']
      Descending sort
      list before sort [10, 16, 9, 24, 5]
      list after sort : [5, 9, 10, 16, 24]

      Example 2

      In this example, the str.lower() method is used as key parameter in sort() method.
      list1 = ['Physics', 'biology', 'Biomechanics', 'psychology']
      print ("list before sort", list1)
      list1.sort(key=str.lower)
      print ("list after sort : ", list1)
      It will produce the following output
      list before sort ['Physics', 'biology', 'Biomechanics', 'psychology']
      list after sort : ['biology', 'Biomechanics', 'Physics', 'psychology']

      Example 3

      Let us use a user-defined function as the key parameter in sort() method. The myfunction() uses % operator to return the remainder, based on which the sort is done.
      def myfunction(x):
         return x%10
      list1 = [17, 23, 46, 51, 90]
      print ("list before sort", list1)
      list1.sort(key=myfunction)
      print ("list after sort : ", list1)
      It will produce the following output
      list before sort [17, 23, 46, 51, 90]
      list after sort: [90, 51, 23, 46, 17]

      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.