=============================
 Data type: tuple & for loop
=============================

.. _tuple:

.. index:: for, programm control: for, data type: tuple

.. |a| image:: /images/all/python-basics/rounded_braces-100.png
   :width: 100px

Objectives
==========
   
.. tabularcolumns:: | c | l |
   :border: none

+-------+-------------------------------------------------------------------------+
|  |a|  |   The specifics of the tuple data type, short and sweet.                |
|       |                                                                         |
+-------+-------------------------------------------------------------------------+

Instructions
============
:Tasks:

1. Create a second file: tuple_and_lists.py
   (Note: files must not be named for reserved words, because it can lead to 
   name conflicts!)
2. Save your address in a tuple.
3. Enter the address of the tuple.
4. Use a for loop to output the tuple.


Content
=======

Properties ...
----------------

- Immutable like strings
- External characteristic in the source code are the parentheses
- Can take any object
- Parts of a tuple can be extract. The index starts with 0. 
- Attempt to change the value of a tuple entry is not possible!


Example:
---------
In these examples, the for loop is used for the control flow.

.. ifconfig:: language == 'de'

  ::
  
      T1 = () # ein leerer Tupel (eher ungewöhnlich und rein akademisch betrachtet)
      t2 = ('Das', 'tapfere', 'Schneiderlein', 'traf', 7, 'auf', 'einen', 'Streich')
      print(t2[0], t2[1], t2[2], t2[3], t2[4], t2[5], t2[6], t2[7])
      for i in t2:
          print(i, )
      print()
      print(t3)
      t2[4] = 9 # Wird das funktionieren?


.. ifconfig:: language == 'en'

  ::
  
      T1 = () # an empty tupel (considered unusual and purely academic)
      t2 = ('The', 'quick', 'brown', 'fox', 'jumps', 'over', 7, 'stones')
      print(t2[0], t2[1], t2[2], t2[3], t2[4], t2[5], t2[6], t2[7])
      for i in t2:
          print(i, )
      print()
      print(t3)
      t2[4] = 9 # Will that work?

As you can extract parts of a tuple is in the station :ref:`slicing <slicing>` shown.