Data structures in python continued.. (tuples) .. [P-4]

[Humble]

Tuples are represented by () ..

Code:

>>> t=1,3,4
>>> t
(1, 3, 4)
>>> type(t)
<type ‘tuple’>

If the tuple has only one entry its needed to end it with a “,”.

Code:

>>> z=1
>>> type(z)
<type ‘int’>
>>> z=1,
>>> type(z)
<type ‘tuple’>
>>>

Tuples can be indexed..

Code:

>>> t[0]
1
>>> t[1]
3

Tuples are immutable..

Code:

>>> t[1]=5
Traceback (most recent call last):
File “<stdin>”, line 1, in <module>
TypeError: ‘tuple’ object does not support item assignment

Tuples can be formed with different homogenous data types .. mutables can also be part of tuples..

Code:

>>> k = t,2,3,4
>>> k
((1, 3, 4), 2, 3, 4)

Tuples can be unpacked by having same number of args in left hand side of “=”

Code:

>>> k[0]
(1, 3, 4)
>>> x,y,z = k[0]
>>> x
1
>>> y
3
>>> z
4

>>>

Some methods available for tuples:

index

Code:

>>> k
((1, 3, 4), 2, 3, 4, [3, 2, 1])
>>> k.index(3)
2
>>>

count

Code:

>>> k.count(4)
1

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