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      Nested Loops

      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.

      Nested Loops

      Python programming language allows to use one loop inside another loop. Following section shows few examples to illustrate the concept for nested for loop and while loop.

      Python Nested For Loop Syntax

      The syntax for a Python nested foor loop statement in Python programming language is as follows
      for iterating_var in sequence:
         for iterating_var in sequence:
            statements(s)
         statements(s)

      Example

      The following program uses a nested for loop to find the prime numbers from 2 to 100
      #!/usr/bin/python
      
      months = ["jan", "feb", "mar"]
      days = ["sun", "mon", "tue"]
      
      
      for x in months:
        for y in days:
          print(x, y)
      
      print "Good bye!"
      When the above code is executed, it produces following result
      ('jan', 'sun')
      ('jan', 'mon')
      ('jan', 'tue')
      ('feb', 'sun')
      ('feb', 'mon')
      ('feb', 'tue')
      ('mar', 'sun')
      ('mar', 'mon')
      ('mar', 'tue')
      Good bye!

      Nested While Loop Syntax

      The syntax for a nested while loop statement in Python programming language is as follows −
      while expression:
         while expression:
            statement(s)
         statement(s)
      A final note on loop nesting is that you can put any type of loop inside of any other type of loop. For example a for loop can be inside a while loop or vice versa.

      Example

      The following program uses a nested for loop to find the prime numbers from 2 to 100
      #!/usr/bin/python
      
      i = 2
      while(i < 100):
         j = 2
         while(j <= (i/j)):
            if not(i%j): break
            j = j + 1
         if (j > i/j) : print i, " is prime"
         i = i + 1
      
      print "Good bye!"
      When the above code is executed, it produces following result
      2 is prime
      3 is prime
      5 is prime
      7 is prime
      11 is prime
      13 is prime
      17 is prime
      19 is prime
      23 is prime
      29 is prime
      31 is prime
      37 is prime
      41 is prime
      43 is prime
      47 is prime
      53 is prime
      59 is prime
      61 is prime
      67 is prime
      71 is prime
      73 is prime
      79 is prime
      83 is prime
      89 is prime
      97 is prime
      Good bye!

      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.