Difference between revisions of "Python/C3/Loops/English-timed"
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{| border=1 | {| border=1 | ||
| − | + | |'''Time''' | |
| − | + | |'''Narration''' | |
| + | |||
|- | |- | ||
| − | | | + | | 00:01 |
| Hello Friends and Welcome to the tutorial on 'loops' in Python. | | Hello Friends and Welcome to the tutorial on 'loops' in Python. | ||
|- | |- | ||
| − | | | + | | 00:05 |
| At the end of this tutorial, you will be able to, | | At the end of this tutorial, you will be able to, | ||
| − | + | use the '''for''' loop | |
| − | + | use the '''while''' loop | |
| − | + | Use '''break''', '''continue''' and '''pass''' statements to play around with loops. | |
| − | + | ||
|- | |- | ||
| − | | | + | | 00:17 |
| Before beginning this tutorial,we would suggest you to complete the tutorial on "Getting started with for" and "Conditionals". | | Before beginning this tutorial,we would suggest you to complete the tutorial on "Getting started with for" and "Conditionals". | ||
|- | |- | ||
| − | | | + | | 00:24 |
| Let us start our ipython interpreter. | | Let us start our ipython interpreter. | ||
|- | |- | ||
| − | | | + | |00:28 |
|Type ipython in the terminal | |Type ipython in the terminal | ||
|- | |- | ||
| − | | | + | | 00:32 |
| We shall first begin with the while loop. | | We shall first begin with the while loop. | ||
|- | |- | ||
| − | | | + | | 00:34 |
| The while loop is used for repeated execution as long as a condition is True . | | The while loop is used for repeated execution as long as a condition is True . | ||
|- | |- | ||
| − | | | + | | 00:39 |
| Let us print the squares of all the odd numbers less than 10, using the while loop. | | Let us print the squares of all the odd numbers less than 10, using the while loop. | ||
|- | |- | ||
| − | | | + | |00:45 |
| − | |Type i = 1 | + | |Type i = 1 while i less than 10 colon print i multiply by i, i += 2 |
| − | + | ||
| − | + | ||
| − | + | ||
| − | + | ||
|- | |- | ||
| − | | | + | | 01:19 |
| This loop prints the squares of the odd numbers below 10. | | This loop prints the squares of the odd numbers below 10. | ||
|- | |- | ||
| − | | | + | | 01:23 |
| The while loop, repeatedly checks if the condition is true and executes the block of code within the loop, if it is. | | The while loop, repeatedly checks if the condition is true and executes the block of code within the loop, if it is. | ||
|- | |- | ||
| − | | | + | | 01:30 |
| As with any other block in Python, the code within the while block is indented to the right by 4 spaces. | | As with any other block in Python, the code within the while block is indented to the right by 4 spaces. | ||
|- | |- | ||
| − | | | + | | 01:41 |
| Pause the video here, try out the following exercise and resume the video. | | Pause the video here, try out the following exercise and resume the video. | ||
|- | |- | ||
| − | | | + | | 01:48 |
| '''Write a while loop to print the squares of all the even''' numbers below 10. | | '''Write a while loop to print the squares of all the even''' numbers below 10. | ||
|- | |- | ||
| − | | | + | | 01:55 |
| Switch to the terminal for solution. | | Switch to the terminal for solution. | ||
|- | |- | ||
| − | | | + | |01:58 |
| − | |Type i = 2 | + | |Type i = 2, while i less than 10 colon print i multiply by i i += 2 |
| − | + | ||
| − | while i less than 10 colon | + | |
| − | + | ||
| − | + | ||
|- | |- | ||
| − | | | + | | 02:27 |
| Let us now solve the same problem of printing the squares of all odd numbers less than 10, using the for loop. | | Let us now solve the same problem of printing the squares of all odd numbers less than 10, using the for loop. | ||
|- | |- | ||
| − | | | + | | 02:34 |
| As we know, the for loop iterates over a list or any other sequential data type. | | As we know, the for loop iterates over a list or any other sequential data type. | ||
|- | |- | ||
| − | | | + | | 02:40 |
| So, we use the range function to get a list of odd numbers below 10, and then iterate over it and print the required stuff. | | So, we use the range function to get a list of odd numbers below 10, and then iterate over it and print the required stuff. | ||
|- | |- | ||
| − | | | + | |02:48 |
| − | |Type for n in range within bracket 1 comma 10 comma 2 colon | + | |Type for n in range within bracket 1 comma 10 comma 2 colon. print n multiply by n |
| − | + | ||
|- | |- | ||
| − | | | + | | 03:07 |
| We can see that we got the same output as before. | | We can see that we got the same output as before. | ||
|- | |- | ||
| − | | | + | | 03:10 |
| Note that the lines of code are less. | | Note that the lines of code are less. | ||
|- | |- | ||
| − | | | + | | 03:13 |
| Pause the video here, try out the following exercise and resume the video. | | Pause the video here, try out the following exercise and resume the video. | ||
|- | |- | ||
| − | | | + | | 03:19 |
| '''Write a for loop to print the squares of all the even''' numbers below 10. | | '''Write a for loop to print the squares of all the even''' numbers below 10. | ||
|- | |- | ||
| − | | | + | | 03:24 |
| − | | Switch to the terminal | + | | Switch to the terminal |
|- | |- | ||
| − | | | + | | 03:26 |
| − | |Type for n in range within bracket 2 comma 10 comma 2 colon | + | |Type for n in range within bracket 2 comma 10 comma 2 colon. print n multiply by n |
| − | + | ||
|- | |- | ||
| − | | | + | | 03:46 |
| Let us now look at how to use the keywords, pass , break and continue . | | Let us now look at how to use the keywords, pass , break and continue . | ||
|- | |- | ||
| − | | | + | | 03:52 |
| − | | As we already know, pass | + | | As we already know, pass is just a syntactic filler. |
|- | |- | ||
| − | | | + | | 03:56 |
| It is used for the sake of completion of blocks, that do not have any code within them. | | It is used for the sake of completion of blocks, that do not have any code within them. | ||
|- | |- | ||
| − | | | + | |04:02 |
| − | |Type for n in range within bracket 2 comma 10 comma 2 colon | + | |Type for n in range within bracket 2 comma 10 comma 2 colon pass And Enter. |
| − | + | ||
| − | + | ||
| − | + | ||
| − | + | ||
|- | |- | ||
| − | | | + | | 04:20 |
| break is used to break out of the innermost loop. | | break is used to break out of the innermost loop. | ||
|- | |- | ||
| − | | | + | | 04:24 |
| The while loop to print the squares of all the odd numbers below 10, can be modified using the break statement, as follows | | The while loop to print the squares of all the odd numbers below 10, can be modified using the break statement, as follows | ||
|- | |- | ||
| − | | | + | |04:31 |
| − | |Type = 1 | + | |Type = 1,while True colon print i multiply by i i += 2 if i is less than 10 colon break |
| − | + | ||
| − | while True colon | + | |
| − | + | ||
| − | + | ||
| − | + | ||
| − | + | ||
|- | |- | ||
| − | | | + | |05:10 |
|So we got a syntax error because 'if' is not inside the while loop | |So we got a syntax error because 'if' is not inside the while loop | ||
| − | + | ||
| − | + | So type while True colon print i multiply by i, i += 2 | |
| − | + | ||
| − | + | if i less than 10 colon break Make sure that 'if' is inside the while loop. | |
| − | + | ||
| − | Make sure that 'if' is inside the while loop. | + | |
|- | |- | ||
| − | | | + | | 05:42 |
| continue is used to skip execution of the rest of the loop on this iteration and continue to the end of this iteration. | | continue is used to skip execution of the rest of the loop on this iteration and continue to the end of this iteration. | ||
|- | |- | ||
| − | | | + | | 05:50 |
| − | | So, we wish to print the squares of all the odd numbers below 10, which are not multiples of 3, we would modify the | + | | So, we wish to print the squares of all the odd numbers below 10, which are not multiples of 3, we would modify the for loop as follows. |
|- | |- | ||
| − | | | + | |06:03 |
|So, in terminal, Type for n in range within bracket 1 comma 10 comma 2 colon | |So, in terminal, Type for n in range within bracket 1 comma 10 comma 2 colon | ||
| − | + | if n modulo 3 == 0 colon | |
| − | + | continue | |
| − | + | print n multiply by n | |
| − | + | ||
|- | |- | ||
| − | | | + | | 06:36 |
| Now Pause the video here, try out the following exercise and resume the video. | | Now Pause the video here, try out the following exercise and resume the video. | ||
|- | |- | ||
| − | | | + | | 06:41 |
| Using the continue keyword modify the for loop, with the range(2 comma 10 comma 2) , to print the squares of even numbers below 10, which are multiples of 4. | | Using the continue keyword modify the for loop, with the range(2 comma 10 comma 2) , to print the squares of even numbers below 10, which are multiples of 4. | ||
|- | |- | ||
| − | | | + | | 06:53 |
| − | | | + | | (Do not modify the range function call.) |
|- | |- | ||
| − | | | + | | 06:59 |
| Now Switch to the terminal for solution. | | Now Switch to the terminal for solution. | ||
|- | |- | ||
| − | | | + | |07:02 |
|Type for n in range within bracket 2 comma 10 comma 2 colon | |Type for n in range within bracket 2 comma 10 comma 2 colon | ||
| − | + | ||
| − | + | if n modulo 4 colon continue print n multiply by n | |
| − | + | ||
|- | |- | ||
| − | | | + | | 07:30 |
| This brings us to the end of this tutorial. | | This brings us to the end of this tutorial. | ||
|- | |- | ||
| − | | | + | | 07:33 |
| − | | In this tutorial, we have learnt to, | + | | In this tutorial, we have learnt to, Iterate over a sequence using ``for'' and ``while'' loops. |
|- | |- | ||
| − | | | + | | 07:38 |
| − | | | + | |Break out of loops using ''break'' statement. |
|- | |- | ||
| − | | | + | | 07:42 |
| − | | | + | |Skip iterations using ''continue'' statement. |
|- | |- | ||
| − | | | + | | 07:45 |
| − | | | + | |Use the ''pass'' statement in a loop. |
|- | |- | ||
| − | | | + | | 07:49 |
| Here are some self assessment questions for you to solve | | Here are some self assessment questions for you to solve | ||
|- | |- | ||
| − | | | + | | 07:52 |
| − | | | + | |Given range(1 comma 4) ; Write a code to print only the number 1. |
|- | |- | ||
| − | | | + | | 08:01 |
| − | | | + | |Second one is, Which statement do you use to skip iterations. - break - pass - continue |
|- | |- | ||
| − | | | + | | 08:10 |
| And the answers, | | And the answers, | ||
|- | |- | ||
| − | | | + | | 08:12 |
| − | | | + | | First one, We can use the break statement in a for loop as,''' colon colon''' |
| − | ''' colon colon''' | + | |
|- | |- | ||
| − | | | + | | 08:21 |
| '''for i in range within bracket 1 comma 4 colon''' | | '''for i in range within bracket 1 comma 4 colon''' | ||
|- | |- | ||
| − | | | + | | 08:27 |
| Then print i break | | Then print i break | ||
|- | |- | ||
| − | | | + | | 08:30 |
| And second one, In order to skip iterations,we make use of the continue statement. | | And second one, In order to skip iterations,we make use of the continue statement. | ||
|- | |- | ||
| − | | | + | | 08:37 |
| Hope you have enjoyed this tutorial and found it useful. | | Hope you have enjoyed this tutorial and found it useful. | ||
|} | |} | ||
Latest revision as of 12:25, 27 March 2017
| Time | Narration |
| 00:01 | Hello Friends and Welcome to the tutorial on 'loops' in Python. |
| 00:05 | At the end of this tutorial, you will be able to,
use the for loop use the while loop Use break, continue and pass statements to play around with loops. |
| 00:17 | Before beginning this tutorial,we would suggest you to complete the tutorial on "Getting started with for" and "Conditionals". |
| 00:24 | Let us start our ipython interpreter. |
| 00:28 | Type ipython in the terminal |
| 00:32 | We shall first begin with the while loop. |
| 00:34 | The while loop is used for repeated execution as long as a condition is True . |
| 00:39 | Let us print the squares of all the odd numbers less than 10, using the while loop. |
| 00:45 | Type i = 1 while i less than 10 colon print i multiply by i, i += 2 |
| 01:19 | This loop prints the squares of the odd numbers below 10. |
| 01:23 | The while loop, repeatedly checks if the condition is true and executes the block of code within the loop, if it is. |
| 01:30 | As with any other block in Python, the code within the while block is indented to the right by 4 spaces. |
| 01:41 | Pause the video here, try out the following exercise and resume the video. |
| 01:48 | Write a while loop to print the squares of all the even numbers below 10. |
| 01:55 | Switch to the terminal for solution. |
| 01:58 | Type i = 2, while i less than 10 colon print i multiply by i i += 2 |
| 02:27 | Let us now solve the same problem of printing the squares of all odd numbers less than 10, using the for loop. |
| 02:34 | As we know, the for loop iterates over a list or any other sequential data type. |
| 02:40 | So, we use the range function to get a list of odd numbers below 10, and then iterate over it and print the required stuff. |
| 02:48 | Type for n in range within bracket 1 comma 10 comma 2 colon. print n multiply by n |
| 03:07 | We can see that we got the same output as before. |
| 03:10 | Note that the lines of code are less. |
| 03:13 | Pause the video here, try out the following exercise and resume the video. |
| 03:19 | Write a for loop to print the squares of all the even numbers below 10. |
| 03:24 | Switch to the terminal |
| 03:26 | Type for n in range within bracket 2 comma 10 comma 2 colon. print n multiply by n |
| 03:46 | Let us now look at how to use the keywords, pass , break and continue . |
| 03:52 | As we already know, pass is just a syntactic filler. |
| 03:56 | It is used for the sake of completion of blocks, that do not have any code within them. |
| 04:02 | Type for n in range within bracket 2 comma 10 comma 2 colon pass And Enter. |
| 04:20 | break is used to break out of the innermost loop. |
| 04:24 | The while loop to print the squares of all the odd numbers below 10, can be modified using the break statement, as follows |
| 04:31 | Type = 1,while True colon print i multiply by i i += 2 if i is less than 10 colon break |
| 05:10 | So we got a syntax error because 'if' is not inside the while loop
So type while True colon print i multiply by i, i += 2 if i less than 10 colon break Make sure that 'if' is inside the while loop. |
| 05:42 | continue is used to skip execution of the rest of the loop on this iteration and continue to the end of this iteration. |
| 05:50 | So, we wish to print the squares of all the odd numbers below 10, which are not multiples of 3, we would modify the for loop as follows. |
| 06:03 | So, in terminal, Type for n in range within bracket 1 comma 10 comma 2 colon
if n modulo 3 == 0 colon continue print n multiply by n |
| 06:36 | Now Pause the video here, try out the following exercise and resume the video. |
| 06:41 | Using the continue keyword modify the for loop, with the range(2 comma 10 comma 2) , to print the squares of even numbers below 10, which are multiples of 4. |
| 06:53 | (Do not modify the range function call.) |
| 06:59 | Now Switch to the terminal for solution. |
| 07:02 | Type for n in range within bracket 2 comma 10 comma 2 colon
if n modulo 4 colon continue print n multiply by n |
| 07:30 | This brings us to the end of this tutorial. |
| 07:33 | In this tutorial, we have learnt to, Iterate over a sequence using ``for and ``while loops. |
| 07:38 | Break out of loops using break statement. |
| 07:42 | Skip iterations using continue statement. |
| 07:45 | Use the pass statement in a loop. |
| 07:49 | Here are some self assessment questions for you to solve |
| 07:52 | Given range(1 comma 4) ; Write a code to print only the number 1. |
| 08:01 | Second one is, Which statement do you use to skip iterations. - break - pass - continue |
| 08:10 | And the answers, |
| 08:12 | First one, We can use the break statement in a for loop as, colon colon |
| 08:21 | for i in range within bracket 1 comma 4 colon |
| 08:27 | Then print i break |
| 08:30 | And second one, In order to skip iterations,we make use of the continue statement. |
| 08:37 | Hope you have enjoyed this tutorial and found it useful. |
