PoojaMoolya: Created page with "{| border=1 | '''Time''' | '''Narration''' |- | 00:01 | Welcome to the spoken tutorial on '''Getting Started with tuples'''. |- | 00:0..."

2019-06-04T07:13:45Z

Created page with "{| border=1 | <center>'''Time'''</center> | <center>'''Narration'''</center> |- | 00:01 | Welcome to the spoken tutorial on '''Getting Started with tuples'''. |- | 00:0..."

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{| border=1
| <center>'''Time'''</center>
| <center>'''Narration'''</center>

|-
| 00:01
| Welcome to the spoken tutorial on '''Getting Started with tuples'''.

|-
| 00:07
| In this tutorial we will: Understand what '''tuples''' are

|-
| 00:12
| Compare '''tuples''' with '''lists'''

|-
| 00:15
| Know why they are needed and Learn to use them.

|-
| 00:21
| To record this tutorial, I am using

'''Ubuntu Linux 16.04''' operating system

|-
| 00:29
| '''Python 3.4.3 '''and '''IPython 5.1.0'''

|-
| 00:36
| To practise this tutorial, you should know how to

run basic '''Python '''commands on the '''ipython console'''

and use '''lists'''

|-
| 00:47
| If not, see the relevant '''Python '''tutorials on this website.

|-
| 00:53
| First we will learn about '''tuples'''.

|-
| 00:57
| '''Tuple''' is a collection of '''elements''' similar to a '''list'''.

|-
| 01:02
| '''Tuple''' uses '''parentheses''', whereas list uses '''square brackets.'''

|-
| 01:08
| '''Elements''' of a '''tuple''' cannot be changed once it is assigned.

|-
| 01:13
| But in a '''list, elements''' can be changed.

|-
| 01:17
| Here are few examples for declaring '''tuples'''.

|-
| 01:21
| ''Inside brackets'' 1, 2.5 is a '''tuple''' with two '''elements'''.

|-
| 01:27
| The same can be declared as 1, 2.5.

|-
| 01:32
| ''Inside brackets ''1 comma is a '''tuple''' with one '''element'''.

|-
| 01:37
| The same can be declared as 1 comma

|-
| 01:41
|
''Inside brackets again inside brackets ''1 comma and outside bracket a comma is a '''tuple''' with one '''tuple''' as '''element'''.

|-
| 01:52
| The same can be declared as ''inside brackets'' 1 comma and outside bracket a comma.

|-
| 01:59
| Let us start '''ipython'''. Open the '''terminal.'''

|-
| 02:04
| Type '''ipython3 '''and press '''Enter.'''

|-
| 02:10
|From here onwards, remember to press the '''Enter''' key after typing every command on the '''terminal'''.

|-
| 02:17
| Let's learn to create a '''tuple'''.

Type, '''t '''''is equal to inside brackets''''' 1 '''''comma''''' 2.5 '''''comma''''' '''''inside double quotes '''''hello '''''comma''''' minus 4 '''''comma''''' '''''inside double quotes '''''world '''''comma''''' 1.24 '''''comma''''' 5'''

|-
| 02:38
| Type, '''t'''

It is similar to '''list''' except that '''parentheses''' are used instead of '''square brackets'''.

|-
| 02:47
| At least one comma is mandatory for a '''tuple'''.

|-
| 02:51
| The brackets are optional, but should be added for clarity.

|-
| 02:56
| The items in the '''tuple''' can be accessed by their '''index''' '''positions'''.

|-
| 03:02
| Type, '''t '''''inside square brackets '''''3'''

|-
| 03:07
| Type, '''t '''''inside square brackets '''''1 '''''colon '''''5 '''''colon '''''2'''

It prints the corresponding '''slice.'''

|-
| 03:16
| Now we try to change an '''element''' in the '''tuple'''.

|-
| 03:20
| Type, '''t '''''inside square brackets '''''2 '''''is equal to''''' '''''inside double quotes '''''Hello'''

|-
| 03:28
| We can see that, it raises an error saying ''''tuple object does not support item assignment''''.

|-
| 03:35
| It shows, '''elements''' of a '''tuple''' cannot be changed after it is created.

This is called '''immutability. '''

|-
| 03:44
| We can iterate over '''tuples''' like '''lists'''.

|-
| 03:48
| Type, '''for x in t '''''colon''

'''print '''''inside brackets '''''x'''

|-
| 03:57
| It prints each '''element''' of the '''tuple t.'''

|-
| 04:01
| Pause the video.

Try this exercise and then resume the video.

|-
| 04:07
| Let us look at a simple problem of '''swapping values'''.

|-
| 04:12
| Given, '''a''''' is equal to''''' 5''' and '''b '''''is equal to''''' 7''', swap the values of '''a''' and '''b'''.

|-
| 04:20
| Switch to the '''terminal''' for the solution.

|-
| 04:24
| Type, '''a '''''is equal to''''' 5'''

|-
| 04:28
| '''b '''''is equal to''''' 7'''

|-
| 04:32
| Then type, '''a'''

Type, '''b'''

|-
| 04:38
| We now create a '''variable''' say, '''temp '''and '''swap''' the '''values''' using this '''variable.'''

|-
| 04:45
| Type

'''temp '''''is equal to''''' a '''

|-
| 04:49
| '''a '''''is equal to''''' b'''

|-
| 04:53
| '''b '''''is equal to''''' temp'''

|-
| 04:57
| Then type, '''a'''

Type, '''b'''

|-
| 05:02
| We can see that the values are successfully swapped now.

But this is the traditional approach.

|-
| 05:10
| Now let us do it in the '''Python''' way.

|-
| 05:14
| Type

'''a '''''is equal to''''' 5'''

'''b '''''is equal to''''' 7'''

|-
| 05:21
| '''a, b '''''is equal to''''' b, a'''

|-
| 05:27
| Now we will check whether the values are swapped.

|-
| 05:31
| Type, '''a'''

Type, '''b'''

|-
| 05:36
| We can see that the '''values''' are '''swapped''' easily.

|-
| 05:40
| We can also do this for different '''datatypes'''.

|-
| 05:44
| Type, '''a '''''is equal to''''' 2.5 '''

|-
| 05:49
| '''b '''''is equal to inside double quotes''''' hello'''

'''a, b '''''is equal to''''' b, a'''

|-
| 05:59
| Now to check the values, type, '''a'''

Type, '''b'''

|-
| 06:07
| This is possible because of the '''immutability''' of '''tuples'''.

|-
| 06:12
| This is called''' tuple packing''' and '''unpacking'''.

|-
| 06:16
| When you type, '''a''' ''comma'' '''b''' ''is equal to'' '''b''' ''comma'' '''a'''

|-
| 06:21
| First, the values of '''b''' and '''a''' are '''packed''' into a '''tuple''' on the right side. Then it is '''unpacked''' into the '''variables''' '''a''' and '''b'''.

|-
| 06:32
| Let us first see about '''tuple packing'''.

|-
| 06:36
| Type, '''5 '''''comma''

We can see a '''tuple''' with one '''element'''.

|-
| 06:43
| Type, '''5 '''''comma inside double quotes '''''hello '''''comma''''' 2.5 '''

|-
| 06:49
| Now it is a '''tuple''' with three '''elements'''.

|-
| 06:53
| When we type two or more '''elements''' separated by '''commas''', those '''elements''' are packed into a '''tuple'''.

|-
| 07:01
| '''Immutability''' of '''tuples''' ensures that the '''values''' are not changed during the '''packing''' and '''unpacking'''.

|-
| 07:09
| This brings us to the end of this tutorial. Let us summarize.

|-
| 07:15
| In this tutorial, we have learnt about, '''Tuples'''

|-
| 07:21
| Similarities of '''tuples''' with '''lists'''

|-
| 07:25
| '''Immutability''' of '''tuples''' and Concept of '''Packing''' and '''unpacking''' of '''tuples'''.

|-
| 07:32
| Here are some self assessment questions for you to solve.

|-
| 07:36
| First. Define a '''tuple''' containing two values as given below. The first value is '''integer''' 4 and the second value is '''float''' 2.5.

|-
| 07:50
| Second. If we type, '''a''' ''is equal to''''' 5''' ''comma ''then what is the '''datatype''' of '''a'''?

|-
| 07:58
| Third. If we type, '''a''' ''is equal to inside brackets '''''2''' ''comma '''''3 a''' ''inside square brackets '''''0''' ''comma'' '''a''' ''inside square brackets '''''1''' ''is equal to inside brackets '''''3''' ''comma'' '''4'''

What is the output?

|-
| 08:16
| And the answers,

First. A '''tuple''' is defined by enclosing '''parentheses''' around a sequence of items separated by commas. Hence, we write our '''tuple''' as, ''inside brackets ''4 ''comma'' 2.5

|-
| 08:32
| Second. Since the given data is 5 followed by a comma, it is a '''tuple'''

|-
| 08:39
| Third. The given operation will give a '''TypeError''' because '''tuples''' are '''immutable'''.

|-
| 08:46
| Please post your timed queries in this forum.

|-
| 08:50
| Please post your general queries on Python in this forum.

|-
| 08:55
| FOSSEE team coordinates the TBC project.

|-
|08:59
|Spoken Tutorial Project is funded by NMEICT, MHRD, Govt. of India.

For more details, visit this website.

|-
| 09:09
| This is Priya from IIT Bombay signing off.

Thanks for watching.

|}

Python-3.4.3/C3/Getting-started-with-tuples/English-timed - Revision history

PoojaMoolya: Created page with "{| border=1 | '''Time''' | '''Narration''' |- | 00:01 | Welcome to the spoken tutorial on '''Getting Started with tuples'''. |- | 00:0..."