PoojaMoolya at 10:09, 25 July 2019

2019-07-25T10:09:11Z

PoojaMoolya: Created page with " {| border=1 | '''Time''' | '''Narration''' |- | 00:01 | Welcome to the spoken tutorial on '''Conditional statements'''. |- | 00:06 | In..."

2019-06-03T11:58:46Z

Created page with " {| border=1 | <center>'''Time'''</center> | <center>'''Narration'''</center> |- | 00:01 | Welcome to the spoken tutorial on '''Conditional statements'''. |- | 00:06 | In..."

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

|-
| 00:01
| Welcome to the spoken tutorial on '''Conditional statements'''.

|-
| 00:06
| In this tutorial, we will learn to use

'''if/else blocks'''

|-
| 00:13
| '''if/elif/else blocks'''

'''Ternary''' '''conditional''' '''statement '''and '''Pass statement'''

|-
| 00:22
| To record this tutorial, I am using

'''Ubuntu Linux 16.04''' operating system

|-
| 00:30
| '''Python 3.4.3'''

and '''IPython 5.1.0'''

|-
| 00:37
| To practice this tutorial, you should know how to use

basic''' data types '''and '''operators '''

|-
| 00:46
| '''strings '''and '''Input/Output statements'''

|-
| 00:50
| If not, see the relevant Python tutorials on this website.

|-
| 00:55
| First let us learn about''' if condition. '''

|-
| 00:59
| '''if condition '''is used to decide whether to execute the statements inside the '''if block '''or not.

Here is the syntax.

|-
| 01:10
| Next we will see about '''if else condition'''.

|-
| 01:14
| When the test condition is true, it will execute the body of '''if'''.

|-
| 01:20
| If the condition is '''False''', body of the '''else''' is executed.

|-
| 01:25
| Note that, '''if''' and '''else''' statements end with a colon.

|-
| 01:30
| This denotes the beginning of the code block of '''True''' or '''False''' condition.

|-
| 01:36
| All the '''statements''' inside a '''code block''' are '''indented''' by 4 spaces.

|-
| 01:42
| Let us start '''ipython.'''

Open the '''terminal'''.

|-
| 01:48
| Type '''ipython3 '''and press '''Enter.'''

|-
| 01:53
| From here onwards, remember to press the '''Enter''' key after typing every command on the '''terminal'''.

|-
| 02:00
| Now let us check if an entered number is even or not.

|-
| 02:05
| Type, '''num '''''is equal to''''' int '''''inside brackets''''' input '''''open and close brackets''

|-
| 02:14
| Enter 4 and press '''Enter'''

|-
| 02:18
| Type, '''if num '''''percentage''''' 2 '''''equal to equal to '''''0 '''''colon''

|-
| 02:26
| '''print '''''inside brackets inside single quotes '''''Even'''

|-
| 02:32
| Press backspace four times and type, '''else '''colon

|-
| 0002:39
| '''print '''''inside brackets inside single quotes '''''Odd'''

|-
| 02:44
| Press''' Enter '''twice to get the output.

As expected, it displays '''Even''' as output.

|-
| 02:53
| Note that, the '''statements''' inside a '''code block''' are '''indented''' by 4 spaces automatically.

|-
| 03:00
| Next we will see another '''conditional statement''' called '''elif'''.

|-
| 03:05
| All the syntax and rules for '''elif '''are same as '''if/else statements.'''

|-
| 03:11
| In '''if/else, '''only one condition is checked.

|-
| 03:15
| But in '''elif''' '''statement '''multiple conditions can be checked.

|-
| 03:20
| For example,

The first block of code is executed as soon as condition one evaluates to '''True'''.

|-
| 03:28
| All the subsequent conditions in '''elif '''ladder are not checked.

|-
| 03:33
| The '''else''' '''block''' gets executed if all the '''conditions''' in if and '''elif '''ladder are evaluated to '''False'''.

|-
| 03:42
| Let us understand '''if/elif/else ladder '''with an example.

|-
| 03:48
| Type, '''a '''''is equal to minus''''' 3'''

We have a variable''' a''' which holds '''integer''' value as -3.

|-
| 03:58
| Type as shown.

This program will print '''"positive"''' if '''a''' is '''positive''',

|-
| 04:06
| "'''negative'''" if it is '''negative''' or '''"zero"''' if the above conditions are evaluated to '''False '''

|-
| 04:15
| Press '''Enter''' twice to see the output.

|-
| 04:20
| We can also have any number of '''elif''' conditions within an '''if/elif/else statements'''.

|-
| 04:27
| For example, based on the type of user the corresponding operations are performed using '''elif'''.

|-
| 04:35
| Pause the video.

Try this exercise and then resume the video.

|-
| 04:41
| Given a number, '''num''' as input.

Write an '''if else block '''to''' '''print''' num''', if it is divisible by 10, else print''' 10 '''''asterisk''''' num'''.

|-
|04:53
| The solution is on your screen.

|-
| 04:57
| Next let us learn about '''ternary''' operator.

|-
| 05:01
| Ternary operator allows to test a condition in a single line replacing the multiline''' if-else'''.

|-
| 05:08
|
It can reduce the code size and increase the readability of the code.

Here is the syntax.

|-
| 05:16
| Let us write a '''ternary conditional statement '''to find the largest of two numbers.

|-
| 05:23
| Type,''' a '''''is equal to''''' 4'''

|-
| 05:26
| '''b '''''is equal to''''' 2'''

|-
| 05:30
| '''large '''''underscore '''''num '''''is equal to''''' a if a '''''greater than''''' b else b'''

|-
| 05:39
| '''print''''' inside brackets '''''large '''''underscore''''' num'''

|-
| 05:44
| We got the required output.

|-
| 05:47
| Pause the video.

Try this exercise and then resume the video.

|-
| 05:53
| Given a number, '''n '''as input.

Write a '''ternary operator''' to print''' n''', if it is divisible by 10, else print''' 10 '''''asterisk''''' n'''.

|-
| 06:05
| The solution is on your screen.

|-
| 06:09
| Next we will learn about '''pass statement'''.

|-
| 06:13
| The '''pass '''statement acts as a '''''null ''operation''' (i.e) nothing happens when it executes.

|-
| 06:21
| It works as a '''placeholder''' for a '''block''' of '''code'''.

|-
| 06:25
| It is used in a '''code block '''where actual '''code''' '''implementation''' is not known yet.

|-
| 06:32
| Let us understand the '''pass''' statement with an example.

|-
| 06:37
| Type '''a''' ''is equal to'' '''11'''

|-
| 06:41
| Then type as shown.

|-
| 06:44
| If '''a''''' divided by '''''2''' equals to zero, '''if block''' is executed.

Else no operation is performed.

|-
| 06:54
| Press '''Enter''' key twice to get the output.

Here '''a''''' divided by '''''2''' is not 0.

|-
| 07:02
| So no operation is performed and nothing is displayed as output.

|-
| 07:08
| This brings us to the end of the tutorial.

Let us summarize.

|-
| 07:14
| In this tutorial, we have learnt the '''conditional statements''' such as,

'''if/else statement'''

|-
| 07:22
| '''if/elif/else statement'''

|-
| 07:25
| '''Ternary conditional statement '''and '''Pass statement'''

|-
| 07:30
| Here are some self assessment questions for you to solve.

|-
| 07:35
| First. Given a '''variable t. '''

|-
| 07:38
| Print''' Good Morning '''if it is less than 12, otherwise print''' Hello'''. Use '''if else''' statement.

|-
| 07:47
| Second. Convert the below '''if else''' '''code '''into '''ternary conditional statement'''.

|-
| 07:56
| And the answers,

First. The following code gives the required output.

|-
| 08:03
| Second. Use the following statement to convert the '''if else''' code into a '''ternary''' statement

|-
| 08:11
| Please post your timed queries in this forum.

|-
| 08:15
| Please post your general queries on Python in this forum.

|-
| 08:20
| FOSSEE team coordinates the TBC project.

|-
|08:24
| Spoken Tutorial Project is funded by NMEICT, MHRD, Govt. of India.

For more details, visit this website.

|-
| 08:34
| This is Priya from IIT Bombay signing off. Thanks for watching.

|}

@@ Line 119: / Line 119: @@
 |-
-|  0002:39
+|  02:39
 | '''print '''''inside brackets inside single quotes '''''Odd'''

Python-3.4.3/C3/Conditional-Statements/English-timed - Revision history

PoojaMoolya at 10:09, 25 July 2019

PoojaMoolya: Created page with " {| border=1 | '''Time''' | '''Narration''' |- | 00:01 | Welcome to the spoken tutorial on '''Conditional statements'''. |- | 00:06 | In..."