Pratik kamble: Created page with "{| border=1 | '''Time''' | '''Narration''' |- | 00:01 | Welcome to the spoken tutorial on '''Loops'''. |- | 00:05 | In this tutorial, we will learn to use, '''for loop'''..."

2019-06-11T05:47:51Z

Created page with "{| border=1 | '''Time''' | '''Narration''' |- | 00:01 | Welcome to the spoken tutorial on '''Loops'''. |- | 00:05 | In this tutorial, we will learn to use, '''for loop'''..."

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{| border=1
| '''Time'''
| '''Narration'''

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

|-
| 00:05
| In this tutorial, we will learn to use,

'''for loop'''

'''while loop'''

'''break, continue '''and''' pass statements''' in the '''loops'''

|-
| 00:18
| To record this tutorial, I am using

'''Ubuntu Linux 16.04''' operating system

'''Python 3.4.3 '''and

'''IPython 5.1.0'''

|-
| 00:34
|To practice this tutorial, you should know how to

use''' conditional statements'''

If not, see the relevant '''Python''' tutorials on this website.

|-
|00:45
| Let us begin the tutorial with '''while loop'''.

|-
|00:49
| The '''while loop''' is used to execute a set of '''statements''' as long as a condition is '''true.'''

|-
|00:56
| When the condition becomes '''false''', program control passes to the line immediately after the '''loop'''.

|-
|01:03
| The code inside the '''while loop '''should be indented four spaces to the right.

|-
| 01:09
| Let us start '''ipython.''' Open the '''terminal.'''

|-
| 01:14
| Type '''ipython3 '''and press '''Enter.'''

From here onwards, remember to press the '''Enter''' key after typing every command on the '''terminal'''.

|-
| 01:26
| Let us '''print''' the squares of all the odd numbers less than 10, using the '''while loop'''.

|-
|01:32
| Type, '''i '''''is equal to''''' 1''' '''while i '''''less than '''''10 '''''colon'' '''print '''''inside brackets '''''i '''''asterisk '''''i''' '''i '''''plus equal to '''''2'''

|-
| 01:50
| Here the '''while loop''' repeatedly checks the condition.

|-
|01:54
| If it is '''True''', it '''executes''' the '''block''' of '''code '''within the '''loop'''.

|-
|01:59
| Then press the '''Enter''' key twice to get the output.

|-
| 02:04
| Next let us now solve the same problem using '''for loop'''.

|-
|02:09
| Type, '''for n in range '''''inside brackets '''''1, 10, 2 '''''colon'' '''print '''''inside brackets '''''n '''''asterisk '''''n'''

|-
|02:24
| As we know, the '''for loop''' iterates over a '''list''' or any other '''sequential data type'''.

|-
|02:30
| So, we use the '''range '''function to''' '''get a list of odd numbers below 10 and iterate over it. Then we print the square of '''n'''.

|-
| 02:40
| Press '''Enter''' twice. We can see that we got the same output as before. Note that now the lines of code are less.

|-
| 02:52
| Pause the video here. Try this exercise and then resume the video.

|-
| 02:58
| Write a '''while loop''' to print the squares of all the even numbers below 10.

|-
| 03:04
| Switch back to the '''terminal''' for the solution.

|-
| 03:08
| Type, '''i '''''is equal to''''' 2'''

|-
|03:12
| '''while i '''''less than''''' 10 '''''colon'' '''print '''''inside brackets '''''i '''''asterisk '''''i''' '''i '''''plus equal to '''''2'''

|-
|03:26
| Press the '''Enter '''key twice. We got the required output.

|-
| 03:32
| Pause the video here. Try this exercise and then resume the video.

|-
| 03:39
| Write a '''for loop''' to print the squares of all the even numbers below 10.

|-
| 03:45
| Switch back to the '''terminal''' for the solution.

|-
| 03:49
| Type, '''for n in range '''''inside brackets''''' 2, 10, 2 '''''colon'' '''print '''''inside brackets''''' n''''' asterisk '''''n'''

Press '''Enter''' twice. We got the required output.

|-
| 04:09
| Next let us see at how to use the''' break, pass '''and '''continue''' keywords.

|-
|04:15
| Now type this code to understand the '''pass statement.'''

|-
|04:20
| As we already know, '''pass''' is just a '''placeholder'''.

|-
| 04:24
| It is used for the sake of completion of '''blocks''', that do not have any '''code''' within them.

|-
| 04:31
| Nothing gets printed when we execute this code. Press '''Enter''' twice. As we expected nothing gets printed.

|-
| 04:42
| Next let us understand about the '''break statement.'''

|-
|04:46
|'''break''' is used to break the innermost '''loop'''. Type the code as shown.

|-
|04:53
| Here, it will '''iterate '''each letter in the word '''python.'''

|-
| 04:58
| And it '''breaks '''the loop when '''h '''is the '''iteration''' value. Press '''Enter''' twice to see the output.

|-
| 05:07
| Next let us understand about the '''continue statement.'''

|-
|05:12
|Type the code as shown. The''' continue statement''' rejects all the remaining '''statements''' in the current iteration of the '''loop'''.
And it moves the control back to the top of the '''loop'''.

|-
|05:27
| It will print the squares of all the odd numbers below 10 which are not multiples of 3.

|-
| 05:35
| Press '''Enter''' twice. We got the required output.

|-
| 05:41
| This brings us to the end of this tutorial. Let us summarise.

|-
|05:47
|In this tutorial, we have learnt to,

'''Iterate''' over a '''sequence''' using '''for '''''and '''''while loops'''

'''Break''' out of '''loops''' using '''break statement'''

Skip '''iterations''' using '''continue statement'''

Use the '''pass statement''' in a '''loop'''

|-
| 06:05
| Here are some self assessment questions for you to solve

Given '''range(1,4)''', write a '''code''' to '''print''' only the number 1.

Which '''statement''' do you use to skip '''iterations'''?

|-
| 06:24
| And the answers,

We can use the '''break statement''' in the '''for loop''' as shown here

In order to skip '''iterations''', we can use the '''continue statement'''.

|-
| 06:37
| Please post your timed queries in this forum.

|-
| 06:41
| Please post your general queries on Python in this forum.

|-
| 06:46
| FOSSEE team coordinates the TBC project.

|-
| 06:50
| Spoken Tutorial Project is funded by NMEICT, MHRD, Govt. of India. For more details, visit this website.

|-
| 07:00
| This is Priya from IIT Bombay signing off. Thanks for watching.

|}

Python-3.4.3/C3/Loops/English-timed - Revision history

Pratik kamble: Created page with "{| border=1 | '''Time''' | '''Narration''' |- | 00:01 | Welcome to the spoken tutorial on '''Loops'''. |- | 00:05 | In this tutorial, we will learn to use, '''for loop'''..."