Sunday, September 16, 2018

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Python Ninja Bootcamp 9-Tuple

by SN Gurukul on September 16, 2018 in Basic Python

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In this Python lecture, we will learn about the Tuple.

"Tuple is an ordered collection of immutable elements".

Let's look at Tuple example-

Create Tuple

Tuple is defined by placing the all the elements under parentheses ( ) and separated by a comma.

t = (1,2,3,4,5)

print(t)

>> (1,2,3,4,5)

We have an option in python that tuple can hold different object type (integer, float, string etc.).

t = (1,1.5,'string')

print(t)

>> ( 1,1.5,'string' )

# len() Calculates the length of tuple

print(len(t))

>>3

Tuple Indexing

We can use the index operator [] to access an item in a tuple. Index starts from 0.

my_tuple=(1,2,'three','four')

# Since, we have 4 elements in the tuple. So, the index starts from 0 to 3

print( my_tuple[0] ) # garbs the element at index 0

>>1

print( my_tuple[2] ) # garbs the element at index 2

>> 'three'

print( my_tuple[-1] ) # garbs the last element

>> 'four'

Tuple Slicing

We can access a range of items in a tuple by using the colon.

We have my_tuple = ( 1 , 2 , 'three' , 'four' )

print( my_tuple[1:] ) # garbs everything from the first index

>> ( 2 , 'three' , 'four' )

print( my_tuple[2:] ) # garbs everything from the second index

>> ( 'three' , 'four' )

print( my_tuple[:3] ) # garbs everything from first index 0 to third index(excluded)

>> ( 1 , 2 , 'three' )

print( my_tuple[:-1] ) # garbs everything from 0 index to the last index(excluded)

>> ( 1 , 2 , 'three' )

print( my_tuple[1:3:2] ) # garbs every 2nd element from the 1st index to 3th index(excluded)

>> (2,)

*Important Syntax

print( my_tuple[::-1] ) #  Reverse the tuple

>> ( 'four' , 'three' , 2 , 1 )

Tuple Properties

Mutability

Tuple is immutable, the elements within it can be changed or replaced, unlike string or tuple.

We have my_list = ( 1 , 2 , 'three' , 'four' )

my_tuple[0] = 5

>> TypeError: 'tuple' object does not support item assignment

We can also use the + operator to combine/concatenate two tuples.

t1 = ( 1, 2, 3, 4, 5)

t2 = ( 6, 4, 7, 8, 9)

t3 = t1 + t2

print( t3 )

>> ( 1 , 2, 3, 4, 5, 6, 4, 7, 8, 9 )

We can also use the * operator to repeats a list for the given number of times.

t1= ( 1, 2, 3 )

print( t1 * 3 )

>> ( 1,2,3,1,2,3,1,2,3 )

Built-in Function

Methods that are available with tuple object in Python.

t = (1,1,2,2,2,3,4,5)

print(t)

>> (1,1,2,2,2,3,4,5)

Note: If press TAB after t. in the Juypter notebook. It will show the list of functions available in the tuple.

We have tuple t = (1,1,2,2,2,3,4,5)

print(t.count(2)) # Return the occurrence of the item

>> 3

We have tuple t = (1,2,3,4,5,6)

print(t.index(6)) # Return the index of the item

>>5

EDITS ARE WELCOMED!!

In the next Blog, we will discuss File.

https://sngurukuls247.blogspot.com/2018/09/python-ninja-bootcamp-10-file.html

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