Python-4(Tuples)

1.Tuples :

1.1 introduction to the Tuple :

• A tuple is a collection which is ordered and unchangeable. In Python tuples are written with round brackets.

• Tuples are sequences, just like lists. The differences between tuples and lists are, the tuples cannot be changed unlike lists and tuples use parentheses, whereas lists use square brackets. 

• Creating a tuple is as simple as putting different comma-separated values.

• Technically, lists are mutable objects and tuples are immutable objects. Mutable objects can change (think of mutations), and immutable objects can not change.

       Example :

1. creating a tuple :

   thistuple = ("apple", "banana", "cherry")
   print(thistuple)                                             #output    ('apple', 'banana', 'cherry')

1.2 Access Tuple Items :

• You can access tuple items by referring to the index number, inside square brackets

        Example :

1. access the item present in the tuple 

   thistuple = ("apple", "banana", "cherry")
   print(thistuple[1])                                          #output  banana

1.3 Change Tuple Values :

• Once a tuple is created, you cannot change its values.
• Tuples are unchangeable.

       Example :

1. example tho show the cannot chance the value of  tuple 

   thistuple = ("apple", "banana", "cherry")
   thistuple[1] = "blackcurrant"
   # The values will remain the same:                           #output ('apple', 'banana', 'cherry')
   print(thistuple)

 1.4  Loop Through a Tuple :

• You can loop through the tuple items by using a for loop.

       Example :

1. Iterate through the items and print the values. 

   thistuple = ("apple", "banana", "cherry")              #output     apple
   for x in thistuple:                                                banana
     print(x)                                                         cherry

1.5 Adding and Removing the tuple items :

• Once a tuple is created, you cannot add items to it. Tuples are unchangeable. 

        Example :

1. example to show we cannot add items to a tuple:  

   thistuple = ("apple", "banana", "cherry")
   thistuple[3] = "orange" # This will raise an error
   print(thistuple)
   
   
   #output:
   Traceback (most recent call last):
     File "demo_tuple_add.py", line 2, in <module>
       thistuple[3] = "orange" # This will raise an error
   TypeError: 'tuple' object does not support item assignment

• Tuples are unchangeable, so you cannot remove items from it, but you can delete the tuple completely: 
• The del keyword can delete the tuple completely:

       Example :

1. Removing the tuplecompletely :

   thistuple = ("apple", "banana", "cherry")
   del thistuple
   print(thistuple) #this will raise an error because the tuple no longer exists
   
   
   #output:
   Traceback (most recent call last):
     File "demo_tuple_del.py", line 3, in <module>
       print(thistuple) #this will raise an error because the tuple no longer exists
   NameError: name 'thistuple' is not defined

 1.6  The tuple() Constructor

• It is also possible to use the tuple() constructor to make a tuple.
• Using the tuple() method to make a tuple constructor

       Example :

1. constructor in tuple :

   thistuple = tuple(("apple", "banana", "cherry")) # note the double round-brackets
   print(thistuple)                                                                             

1.7 Tuple methods

• Python has two built-in methods that you can use on tuples.