Python-3.4.3/C2/Getting-started-with-IPython/English-timed - Revision history

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Sandhya.np14 at 17:39, 5 June 2019

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Sandhya.np14 at 17:37, 5 June 2019

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Sandhya.np14 at 16:21, 5 June 2019

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PoojaMoolya: Created page with " {| border=1 | '''Time''' | '''Narration''' |- | 00:01 | Hello Friends. Welcome to the tutorial on "getting started with '''IPython'..."

2019-05-29T12:55:55Z

Created page with " {| border=1 | <center>'''Time'''</center> | <center>'''Narration'''</center> |- | 00:01 | Hello Friends. Welcome to the tutorial on "getting started with '''IPython'..."

New page

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

|-
| 00:01
| Hello Friends. Welcome to the tutorial on "getting started with '''IPython'''".

|-
| 00:07
| At the end of this tutorial, you will be able to, invoke the '''IPython interpreter'''.

|-
| 00:13
| Quit the '''IPython interpreter'''.

|-
| 00:16
| Navigate the '''IPython session''' history.

|-
| 00:20
| Use '''tab-completion''' within '''IPython'''.

|-
| 00:23
| Look up documentation in '''IPython'''.

|-
| 00:26
| Interrupt incomplete or incorrect '''commands'''.

|-
| 00:30
| To record this tutorial, I am using

'''Ubuntu Linux 14.04''' operating system

|-
| 00:37
| '''Python 3.5.2''' , '''IPython 5.1.0'''

|-
| 00:44
| What is '''IPython'''?

'''IPython''' is an enhanced '''interactive Python interpreter.'''

|-
| 00:50
| It provides features like '''tab-completion''', and easier access to help.

|-
| 00:56
| Let us first see how to start the '''IPython interpreter'''.

|-
| 01:00
| First open the '''terminal '''by pressing '''Ctrl+Alt+T '''keys simultaneously on the keyboard.

|-
| 01:07
| Type '''ipython3''' at the '''prompt''' and press '''Enter'''.

|-
| 01:13
| If '''IPython''' is not installed, please refer to the '''Instruction sheet'''.

|-
| 01:18
| If '''IPython''' is installed, the '''IPython interpreter '''is loaded by running the '''ipython command '''in the '''terminal'''

|-
| 01:25
| The versions of '''Python''' and '''IPython''' that are installed, are shown on the '''terminal'''.

|-
| 01:32
| Some additional helpful information is printed by '''IPython.'''

|-
| 01:37
| After this, we get a prompt with '''i n bracket 1''':

|-
| 01:42
| Now, let us see how we can quit the '''IPython interpreter'''.

Press '''Ctrl+D''' keys.

|-
| 01:48
| A prompt will appear to confirm if we really want to exit.

|-
| 01:53
| Type '''y''' for '''yes''' and quit '''IPython'''.

|-
| 01:57
| Note that '''y''' is given in '''square brackets '''so it is default.

|-
| 02:02
| We could also press '''Enter''' and it will exit.

|-
| 02:05
| Else type '''n '''for '''no '''if you don't want to quit '''IPython'''.

|-
| 02:10
| Let us type '''y'''.

We have quit '''IPython interpreter''' and are back at the '''terminal prompt'''.

|-
| 02:16
| Let us start it again.

Type '''ipython3''' in the '''terminal '''and press '''Enter'''.

|-
| 02:23
| Now, let us learn how to use the interpreter.

Let us start with the simplest operation - addition.

|-
| 02:30
| Type 1 '''plus''' 2 at the '''IPython prompt '''and press '''Enter'''.

|-
| 02:36
| We press '''Enter''' to execute the '''python command'''. Please do so after typing every '''command'''.

|-
| 02:43
| '''IPython''' promptly displays the output as 3.

|-
| 02:47
| Notice that the output is shown with an '''Out square brackets 1''' indication.

|-
| 02:54
| Let us now try a few more operations such as,

5 minus 3,

7 multiplied by 4,

|-
| 03:03
| Each time we press '''Enter''' and see the output on the '''IPython console window.'''

|-
| 03:10
| Let us see how we can navigate to previous commands in '''IPython'''

|-
| 03:15
| For example, say, we want to execute '''print open parenthesis 1 plus 2 close parenthesis.'''

|-
| 03:23
| Instead of typing the whole '''command''', we can recall the '''command 1 plus 2 '''we typed earlier.

|-
| 03:30
| Use the up arrow key to go back to the '''command 1 plus 2'''.

|-
| 03:35
| Now use the left-arrow key to navigate to the beginning of the line.

|-
| 03:40
| Type the word '''print open parenthesis close parenthesis '''on the keyboard.

|-
| 03:49
| We have changed the '''command''' to '''print (1 plus 2). '''Now press '''Enter'''.

|-
| 03:53
| The '''interpreter '''prints the result as 3.

Notice that this time, the indication '''Out square brackets '''is not displayed.

|-
| 04:03
| Now let us execute '''print 10 multiplied by 2. '''

We use the up arrow key to navigate to the previous '''command print (1 plus 2)'''.

|-
| 04:14
| Now replace '''1 plus 2 '''with '''10 multiplied by 2 '''and press '''Enter'''.

|-
| 04:21
| As with any programming language, '''asterix '''is used for '''multiplication operator'''.

|-
| 04:27
| Observe the output on the '''console'''.

|-
| 04:30
| Now, let us see, what is '''tab-completion'''.

Let us consider an example.

|-
| 04:35
| Suppose we want to use the '''function print'''.

|-
| 04:39
| For this we just type '''pri''' at the '''prompt''' and press the '''tab key'''.

|-
| 04:45
| As you can see on the '''console''' that '''IPython''' has autocompleted the '''command''' '''pri''' to '''print'''.

|-
| 04:52
| This feature of '''IPython''' is called the '''tab-completion'''.

|-
|04:56
| Let us see some more possibilities of '''tab completion'''.

Just type '''p''' and then press the tab.

|-
| 05:05
|In this case, we see that '''IPython''' does not complete the '''command'''.

|-
| 05:09
| This is because, there are more than one '''command''' beginning with '''p'''.

|-
| 05:14
| Therefore, it just lists out all the possible '''tab-completions''' of '''p'''.

|-
| 05:20
| Now let us try out an exercise.

|-
| 05:23
| Pause the video, solve the problem and resume the video.

find out the '''commands''' starting with "'''ab'''".
|-
| 05:31
| List out the '''commands''' starting with "'''a'''".

|-
| 05:35
| '''ab ''' autocompletes to '''a b s abs'''.

|-
| 05:40
| '''a tab''' displays a list of all the '''commands''' starting with '''a'''.

|-
| 05:46
| Now, let us see what the '''function abs '''is used for.

|-
| 05:51
| We will use the help feature of '''IPython''' to find out this.

|-
| 05:55
| To see the documentation of a '''function''', type the '''function '''name followed by a '''question mark'''.

|-
| 06:03
| The '''IPython interpreter '''will show the documentation for the '''function'''.

|-
| 06:08
| From the displayed information, it says '''abs''' accepts a number as input and returns it's absolute value.

|-
| 06:16
| Let us see a few examples. On the '''console''', type '''a b s minus 19''' and then '''a b s 19'''.

|-
| 06:29
| We get 19, as expected, in both the cases.

|-
| 06:33
| Now let us try it for decimal numbers.

Let us try '''a b s minus 10.5'''.

|-
| 06:42
| We get 10.5 as the result.

|-
| 06:46
| Pause the video here.

Try out the following exercise and resume the video.

|-
| 06:52
| Look-up the documentation of '''round''' and see how to use it.

|-
| 06:57
| Switch to the '''console''' for the solution.

You can look up the documentation of the '''function round''' by typing '''round question mark'''.

|-
| 07:06
| It says here that the '''function round, rounds''' a number to a given '''precision'''.

|-
| 07:12
| '''ndigits '''is the '''precision''' value for '''round function'''.

Notice, there are extra square brackets around '''ndigits'''.

|-
| 07:21
| This means that '''ndigits''' is optional and 0 is the default value.

|-
| 07:27
| Optional parameters are shown in square brackets in '''Python''' documentation.

|-
| 07:33
| Pause the video here.

Try out the following exercise and resume the video.

|-
| 07:38
| Check the output of

'''round 2.48, round 2.48 comma 1, round 2.484, round 2.484 comma 2 '''

|-
| 07:52
| We get '''round 2.48 is equal to 2.0'''

|-
| 07:57
| '''round 2.48 comma 1 is 2.5'''

|-
| 08:02
| '''round 2.484 is 2.0'''

|-
| 08:06
| '''round 2.484 comma 2 is 2.48 '''

which are what we expect.

|-
| 08:13
| Let us now see how to correct typing errors, which we could make while typing on the '''console'''.
|-
| 08:20
| Let us make a typing error deliberately.

Type '''round open parenthesis 2.484''' and press '''Enter''', without closing the '''parenthesis'''.

|-
| 08:32
| We get a '''prompt '''with dots.

This '''prompt '''is the '''continuation prompt '''of '''IPython'''.

|-
| 08:40
| It appears when the previous line is incomplete.

|-
| 08:44
| Now complete the '''command''' with '''close parenthesis '''and press '''Enter'''.

We get the expected output, that is 2.

|-
| 08:54
| What if we type an incorrect '''command '''and end up with the '''continuation prompt'''?

|-
| 09:00
| In such case, we can press '''Ctrl+C''' keys, to interrupt the '''command''' and get back to the '''IPython prompt'''.

|-
| 09:09
| '''round''' takes only numbers as input. Type '''round(1a'''

|-
| 09:15
| Do not close the '''parenthesis''' and press''' Enter. '''

|-
| 09:19
| We gave alpha-numeric value ''''1 a'''' as input.

Press''' Ctrl+C''' to interrupt the execution.

|-
| 09:28
| Pause the video here.

Try out the following exercise and resume the video.

|-
| 09:34
| Type '''round 2.484,''' without closing the '''parenthesis''' and press '''Enter'''.

|-
| 09:41
| Then cancel the '''command''' using '''Ctrl+C'''. Type the '''command round 2.484 comma 2 '''

|-
| 09:51
| The output on your '''console '''should look like this.

|-
| 10:01
| This brings us to the end of this tutorial.

|-
| 10:04
| In this tutorial,we have learnt to, invoke the '''IPython interpreter '''by typing '''ipython''' in the '''terminal'''.

|-
| 10:13
| Quit the '''IPython interpreter '''by using '''Ctrl+D'''.

|-
| 10:17
| Navigate the '''IPython session''' history by using the arrow keys.

|-
| 10:23
| Use '''tab-completion''' to work faster.

|-
| 10:27
| See the documentation of '''functions '''using '''question mark'''.

|-
| 10:32
| Interrupt commands using '''Ctrl+C''' when we make an error.

|-
| 10:37
| Here are some self assessment questions for you to solve.

|-
| 10:41
| '''IPython is a programming language similar to Python.'''True or False

|-
| 10:46
| Which key combination quits '''IPython'''?

'''Ctrl + C''' , '''Ctrl + D''' , '''Alt + C''' , '''Alt + D'''

|-
| 10:55
| Which character is used at the end of a '''command''', in '''IPython''' to display the documentation?

'''under score ''' , '''question mark ''', '''exclamation mark ''' , '''ampersand '''

|-
| 11:07
| And the answers are- '''False. IPython''' is not a new programming language. It is just an enhanced interactive '''Python interpreter'''.

|-
| 11:17
| We use '''Ctrl + D''' to quit '''IPython interpreter'''.

|-
| 11:21
| We use ''' question mark (?) '''at the end of the '''command''' to display its documentation.

|-
| 11:28
| This video summarises the Spoken Tutorial project.

If you do not have good bandwidth, you may download and watch it.

|-
| 11:37
| We conduct workshops. Give Certificates. Please contact us.

|-
| 11:42
| Do you have questions in THIS '''Spoken Tutorial?'''

Choose the minute and second where you have the question.

|-
| 11:48
| Explain your question briefly.

Someone from the '''FOSSEE''' team will answer them.

Please visit this site.

|-
| 11:56
| Do you have any general / technical questions in '''Python'''?

|-
| 11:59
| Please visit the '''FOSSEE forum''' and post your question.

|-
| 12:04
| The '''FOSSEE '''team coordinates coding of several solved examples of popular books.

|-
| 12:10
| We give honorarium and certificates for those who do this.

For more details, please visit this site.

|-
| 12:17
| The Spoken Tutorial project is funded by NMEICT, MHRD, Govt. of India

|-
| 12:23
| This is Prabhu from IIT Bombay signing off. Thanks for watching

|}

@@ Line 149: / Line 149: @@
 |  Let us now try a few more operations such as-
-minus 3,
+'''5 minus 3''',
-multiplied by 4.
+'''7 multiplied by 4'''.
 |-

@@ Line 306: / Line 306: @@
 |-
 | 06:42
-| We get 10.5 as the result.
+| We get '''10.5''' as the result.
 |-
@@ Line 398: / Line 398: @@
 |  Now complete the '''command''' with close parenthesis and press '''Enter'''.
-We get the expected output, that is 2.
+We get the expected output, that is '''2'''.
 |-

@@ Line 503: / Line 503: @@
 |-
 |  11:07
-|  And the answers are- '''False. IPython''' is not a new programming language. It is just an enhanced interactive '''Python interpreter'''.
+|  And, the answers are- '''False. IPython''' is not a new programming language. It is just an enhanced interactive '''Python interpreter'''.
 |-
@@ Line 521: / Line 521: @@
 |-
 |  11:37
-|  We conduct workshops. Give certificates. Please contact us.
+|  We conduct workshops, give certificates. Please contact us.
 |-
@@ Line 531: / Line 531: @@
 |-
 | 11:48
-| Explain your question briefly.
+| Explain your question briefly. Someone from the '''FOSSEE''' team will answer them.
-−
 Someone from the '''FOSSEE''' team will answer them.
 Please visit this site.
@@ Line 557: / Line 555: @@
 |-
 | 12:17
-|  The Spoken Tutorial project is funded by '''NMEICT, MHRD,''' Govt. of India
+|  The '''Spoken Tutorial''' project is funded by '''NMEICT, MHRD,''' Govt. of India.
 |-
 |  12:23
-|  This is Prabhu from '''IIT Bombay''', signing off. Thanks for watching
+|  This is Prabhu from '''IIT Bombay''', signing off. Thanks for watching.
 |}

@@ Line 481: / Line 481: @@
 | Which key combination quits '''IPython'''?
 '''Ctrl + C'''
-'''Ctrl + D'''
-'''Alt + C'''
+'''Ctrl + D'''
 '''Alt + D'''
@@ Line 490: / Line 493: @@
 |  Which character is used at the end of a '''command''' in '''IPython''' to display the documentation?
 '''under score'''
-'''question mark'''
-'''exclamation mark'''
+'''question mark'''
 '''ampersand '''

@@ Line 6: / Line 6: @@
 |-
 |  00:01
-|  Hello Friends. Welcome to the tutorial on "getting started with '''IPython'''".
+|  Hello friends. Welcome to the tutorial on '''Getting started with IPython'''.
 |-
 |  00:07
-|  At the end of this tutorial, you will be able to, invoke the '''IPython interpreter'''.
+|  At the end of this tutorial, you will be able to: invoke the '''IPython interpreter''',
 |-
 | 00:13
-|  Quit the '''IPython interpreter'''.
+|  quit the '''IPython interpreter''',
 |-
 | 00:16
-| Navigate the '''IPython session''' history.
+| navigate the '''IPython session''' history,
 |-
 | 00:20
-| Use '''tab-completion''' within '''IPython'''.
+| use '''tab-completion''' within '''IPython''',
 |-
 | 00:23
-| Look up documentation in '''IPython'''.
+| look up documentation in '''IPython''',
 |-
 | 00:26
-| Interrupt incomplete or incorrect '''commands'''.
+| interrupt incomplete or incorrect '''commands'''.
 |-
 | 00:30
-|  To record this tutorial, I am using
+|  To record this tutorial, I am using:
-'''Ubuntu Linux 14.04''' operating system
+'''Ubuntu Linux 14.04''' operating system,
 |-
 | 00:37
-|  '''Python 3.5.2''' ,  '''IPython 5.1.0'''
+|  '''Python 3.5.2''',
 |-
@@ Line 46: / Line 47: @@
 |  What is '''IPython'''?
-'''IPython''' is an enhanced '''interactive Python interpreter.'''
+'''IPython''' is an enhanced interactive '''Python interpreter'''.
 |-
 | 00:50
-| It provides features like '''tab-completion''', and easier access to help.
+| It provides features like '''tab-completion''' and easier access to help.
 |-
@@ Line 70: / Line 71: @@
 |-
 |  01:18
-|  If '''IPython''' is installed, the '''IPython interpreter '''is loaded by running the '''ipython command '''in the '''terminal'''
+|  If '''IPython''' is installed, the '''IPython interpreter '''is '''load'''ed by running the '''ipython command '''in the '''terminal'''.
 |-
@@ Line 82: / Line 83: @@
 |-
 |  01:37
-|  After this, we get a prompt with '''i n bracket 1''':
+|  After this, we get a '''prompt''' with '''i n bracket 1''':
 |-
@@ Line 100: / Line 101: @@
 |-
 | 01:57
-| Note that '''y''' is given in '''square brackets '''so it is default.
+| Note that '''y''' is given in square brackets. So, it is default.
 |-
@@ Line 108: / Line 109: @@
 |-
 | 02:05
-| Else type '''n '''for '''no '''if you don't want to quit '''IPython'''.
+| Else, type '''n '''for '''no '''if you don't want to quit '''IPython'''.
 |-
@@ Line 130: / Line 131: @@
 |-
 | 02:30
-|  Type 1 '''plus''' 2 at the '''IPython prompt '''and press '''Enter'''.
+|  Type: '''1 plus 2''' at the '''IPython prompt '''and press '''Enter'''.
 |-
 | 02:36
-| We press '''Enter''' to execute the '''python command'''. Please do so after typing every '''command'''.
+| We press '''Enter''' to execute the '''python command'''. Please do so, after typing every '''command'''.
 |-
 | 02:43
-| '''IPython''' promptly displays the output as 3.
+| '''IPython''' promptly displays the output as '''3'''.
 |-
 | 02:47
-| Notice that the output is shown with an '''Out square brackets 1''' indication.
+| Notice that the output is shown with an '''Out''' square brackets '''1''' indication.
 |-
 |  02:54
-|  Let us now try a few more operations such as,
+|  Let us now try a few more operations such as-
 minus 3,
-multiplied by 4,
+multiplied by 4.
 |-
@@ Line 158: / Line 159: @@
 |-
 |  03:10
-|  Let us see how we can navigate to previous commands in '''IPython'''
+|  Let us see how we can navigate to previous '''command'''s in '''IPython'''.
 |-
 |  03:15
-|  For example, say, we want to execute '''print open parenthesis 1 plus 2 close parenthesis.'''
+|  For example, say, we want to '''execute''' '''print open parenthesis 1 plus 2 close parenthesis.'''
 |-
 | 03:23
-| Instead of typing the whole '''command''', we can recall the '''command 1 plus 2 '''we typed earlier.
+| Instead of typing the whole '''command''', we can recall the command '''1 plus 2 '''we typed earlier.
 |-
 |  03:30
-|  Use the up arrow key to go back to the '''command 1 plus 2'''.
+|  Use the up arrow key to go back to the command''' 1 plus 2'''.
 |-
@@ Line 178: / Line 179: @@
 |-
 | 03:40
-|  Type the word '''print open parenthesis close parenthesis '''on the keyboard.
+|  Type the word '''print''', open parenthesis close parenthesis, on the keyboard.
 |-
@@ Line 186: / Line 187: @@
 |-
 |  03:53
-|  The '''interpreter '''prints the result as 3.
+|  The '''interpreter '''prints the result as '''3'''.
-Notice that this time, the indication '''Out square brackets '''is not displayed.
+Notice that this time, the indication '''Out''' square brackets is not displayed.
 |-