Tuples in python
A guide to understanding tuples in python
In python, tuples are very similar to list. However, they have one major difference. This is the property of immutability. Immutability means not changing over time. That means that once an element is inside a tuple, it cannot be reassigned.
The syntax to represent tuples is ().
>>> tup = (11,22,33)
>>> list1 = [11,22,33]>>> type(tup)
tuple>>> type(list1)
list>>> len(tup)
3
Various object types can also be included in the tuple
>>> tup2 = ('Python', 22)Indexing
>>> tup2[0]
'Python'>>> tup2[-1]
22
Slicing
>>> tup[0:2]
(11, 22)Built-in methods
1) Count method
It counts the occurrences of the element of the tuple.
>>> tup3 = (1,1,2,3,3)
>>> tup3.count(1)
22) Index method
It returns the index position of the element. In case the element is repeated then the first occurrence index position is returned.
>>> tup3.index(1)
0>>> tup3.index(2)
2
Immutability
>>> tup
(11, 22, 33)>>> list1
[11, 22, 33]>>> list1[0] = 'Python'>>> tup[0] = 'Python'
--------------------------------------------------------------------
TypeError Traceback (most recent call last)
<ipython-input-19-49ad9da61fd6> in <module>
----> 1 tup[0] = 'Python'TypeError: 'tuple' object does not support item assignment
The elements in a tuple cannot be re-assigned and therefore it is giving an error. The benefit of using tuple is when you need to make sure that the values don’t change. It provides a very convenient source of data integrity.
Refer to the notebook here.
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