Difference between revisions of "Python-3.4.3/C2/Additional-features-of-IPython/English-timed"

From Script | Spoken-Tutorial
Jump to: navigation, search
 
Line 5: Line 5:
 
|-
 
|-
 
| 00:01
 
| 00:01
| Hello friends and welcome to the Spoken Tutorial on''' Additional Features of IPython'''.
+
| Hello friends and welcome to the '''Spoken Tutorial''' on''' Additional Features of IPython'''.
  
 
|-
 
|-
 
| 00:07
 
| 00:07
| At the end of this tutorial, you will be able to, Retrieve your''' IPython''' '''history'''.
+
| At the end of this tutorial, you will be able to: retrieve your''' IPython''' '''history''',
  
 
|-
 
|-
 
| 00:14
 
| 00:14
| View a part of the '''history'''.
+
| view a part of the '''history''',
  
 
|-
 
|-
 
| 00:17
 
| 00:17
Save a part of a '''history''' to a file.
+
'''save''' a part of a '''history''' to a file,
  
 
|-
 
|-
 
| 00:21
 
| 00:21
Run a script from within''' IPython'''.
+
'''run''' a script from within''' IPython'''.
  
 
|-
 
|-
 
| 00:25
 
| 00:25
| To record this tutorial, I am using  '''Ubuntu Linux 14.04''' operating system
+
| To record this tutorial, I am using:  
 +
'''Ubuntu Linux 14.04''' operating system,
  
 
|-
 
|-
 
| 00:32
 
| 00:32
|  '''Python 3.4.3'''
+
|  '''Python 3.4.3''',
  
 
'''IPython 5.1.0'''
 
'''IPython 5.1.0'''
Line 37: Line 38:
 
| To practice this tutorial, you should know how to
 
| To practice this tutorial, you should know how to
  
use Plots interactively and embellish a plot
+
use '''plot'''s interactively and embellish a plot.
  
 
|-
 
|-
 
| 00:48
 
| 00:48
| If not, see the pre-requisite Python tutorials on this website.
+
| If not, see the pre-requisite '''Python tutorials''' on this website.
  
 
|-
 
|-
Line 53: Line 54:
 
|-
 
|-
 
| 01:07
 
| 01:07
| Let us initialise the '''pylab package'''. Type '''percentage pylab '''and press''' Enter'''
+
| Let us initialise the '''pylab package'''. Type '''percentage pylab '''and press''' Enter'''.
  
 
|-
 
|-
 
| 01:14
 
| 01:14
| To start plotting, type '''x is equal to linspace''' inside the '''brackets minus 2pi comma 2pi comma 100 ''' and press''' Enter.'''
+
| To start plotting, type: '''x is equal to linspace''' inside the brackets '''minus 2pi comma 2pi comma 100 ''' and press''' Enter.'''
  
 
|-
 
|-
 
| 01:31
 
| 01:31
| Next type '''plot''' inside the '''brackets x comma xsin(x) '''and press''' Enter'''
+
| Next, type: '''plot''' inside the brackets '''x comma xsin(x) '''and press''' Enter'''.
  
 
|-
 
|-
 
| 01:42
 
| 01:42
| We got an error saying "'''xsin''' is not defined".
+
| We got an '''error''' saying '''"xsin is not defined".'''
  
This is because '''xsin(x) '''is actually '''x '''multiplied by '''sin(x)'''
+
This is because '''xsin(x) '''is actually '''x '''multiplied by '''sin(x)'''.
  
 
|-
 
|-
 
| 01:54
 
| 01:54
| Here, multiplication sign is missing. So let us now type
+
| Here, the multiplication sign is missing. So, let us now type:
  
'''plot''' inside the '''brackets x comma x multiplied by sin(x)''' and press Enter'''.'''
+
'''plot''' inside the brackets '''x comma x multiplied by sin(x)''' and press '''Enter'''.
  
 
|-
 
|-
 
|02:13
 
|02:13
| Next let us add '''title''' and the '''labels''' for both '''x''' and '''y axes'''.
+
| Next, let us add '''title''' and the '''labels''' for both '''x''' and '''y axes'''.
  
 
|-
 
|-
 
| 02:19
 
| 02:19
| Type '''xlabel''' inside the '''brackets''' inside '''inverted commas''' inside '''dollar sign x ''' and press '''Enter.'''
+
| Type: '''xlabel''' inside the brackets inside inverted commas inside dollar sign '''x ''' and press '''Enter.'''
  
 
|-
 
|-
 
| 02:31
 
| 02:31
| '''ylabel''' inside the '''brackets''' inside '''inverted commas''' inside '''dollar sign f(x) '''
+
| '''ylabel''' inside the brackets inside inverted commas inside dollar sign '''f(x) '''.
  
 
|-
 
|-
 
| 02:43
 
| 02:43
| '''Title''' inside the '''brackets''' inside ''''inverted commas''' inside '''dollar sign x and xsin(x) '''
+
| '''title''' inside the brackets inside inverted commas inside dollar sign '''x and xsin(x). '''
  
 
|-
 
|-
Line 97: Line 98:
 
|-
 
|-
 
|03:01
 
|03:01
| The '''history''' of typed '''commands''' can be retrieved by the ''' percentage history command'''.
+
| The '''history''' of typed '''command'''s can be retrieved by the ''' percentage history''' command.
  
 
|-
 
|-
 
| 03:07
 
| 03:07
| Type '''percentage history''' and press''' Enter'''.
+
| Type: '''percentage history''' and press''' Enter'''.
  
 
|-
 
|-
Line 109: Line 110:
 
|-
 
|-
 
| 03:20
 
| 03:20
| Whatever we executed in the '''terminal''' is stored as history.
+
| Whatever we executed in the '''terminal''', is stored as history.
  
 
|-
 
|-
 
| 03:25
 
| 03:25
| If we want to see what was the fifth '''command''', pass 5 as an '''argument''' to''' percentage history command'''.  
+
| If we want to see what was the fifth '''command''', pass 5 as an '''argument''' to''' percentage history ''' command.  
  
 
|-
 
|-
 
| 03:33
 
| 03:33
| Type '''percentage history space 5 '''and press''' Enter'''.  
+
| Type: '''percentage history space 5 '''and press''' Enter'''.  
  
This displays the fifth '''command''' which we typed.  
+
This displays the fifth command which we typed.  
  
 
|-
 
|-
 
| 03:43
 
| 03:43
| Now pause the video here, and try out the following exercise and resume the video.
+
| Now, pause the video here and try out the following exercise and resume the video.
  
 
|-
 
|-
 
| 03:49
 
| 03:49
| Find out how to list the recent '''commands''' between 5 and 10.
+
| Find out how to list the recent commands between 5 and 10.
  
 
|-
 
|-
 
| 03:55
 
| 03:55
| Switch back to '''terminal'''.
+
| Switch back to the '''terminal'''.
  
 
|-
 
|-
Line 139: Line 140:
 
|-
 
|-
 
| 04:00
 
| 04:00
| Type '''clf()''' and Press Enter.
+
| Type '''clf()''' and press '''Enter'''.
  
Type '''percentage history question mark '''
+
Type: '''percentage history question mark '''
  
 
|-
 
|-
 
| 04:08
 
| 04:08
| Read through the information of''' percentage history command'''.
+
| Read through the information of''' percentage history''' command.
  
 
|-
 
|-
 
| 04:13
 
| 04:13
| We can see, '''percentage history hyphen n 4 hyphen 6''' displays the '''commands''' from 4 to 6.  
+
| We can see, '''percentage history hyphen n 4 hyphen 6''' displays the commands from 4 to 6.  
  
 
|-
 
|-
 
| 04:24
 
| 04:24
| Here '''hyphen n '''is an optional '''argument''' which prints the line numbers.
+
| Here, '''hyphen n '''is an optional '''argument''' which prints the line numbers.
  
Type '''q '''to quit the documentation
+
Type '''q '''to quit the documentation.
  
 
|-
 
|-
 
| 04:37
 
| 04:37
| Now type '''percentage history space 5 hyphen 10''' and press''' Enter.'''
+
| Now, type: '''percentage history space 5 hyphen 10''' and press''' Enter.'''
  
 
|-
 
|-
 
| 04:46
 
| 04:46
| To save the '''history''', we use the '''percentage save command'''.
+
| To '''save''' the '''history''', we use the '''percentage save''' command.
  
 
|-
 
|-
 
| 04:51
 
| 04:51
| Before we do that, let us first look at the '''history''' and identify which lines of code we require.
+
| Before we do that, let us first look at the '''history''' and identify which lines of '''code''' we require.
  
 
|-
 
|-
Line 185: Line 186:
 
|-
 
|-
 
| 05:13
 
| 05:13
| The '''commands''' from fourth to seventh are required.  
+
| The commands from fourth to seventh are required.  
  
 
|-
 
|-
 
| 05:16
 
| 05:16
| So we need the second '''command''' and then the fourth to seventh '''commands''' for our program.  
+
| So, we need the second '''command''' and then the fourth to seventh '''commands''' for our program.  
  
 
|-
 
|-
 
| 05:22
 
| 05:22
| Let us save it in the present working directory. Hence the syntax will be
+
| Let us '''save''' it in the present '''working directory'''. Hence the syntax will be-
  
'''percentage save space plot underscore script.py space 2 space 4 hyphen 7''' and press''' Enter'''
+
'''percentage save space plot underscore script.py space 2 space 4 hyphen 7''' and press''' Enter'''.
  
 
|-
 
|-
 
| 05:47
 
| 05:47
| The first '''argument''' in '''percentage save command''' is the name of the file in which the commands are saved.  
+
| The first '''argument''' in '''percentage save''' command is the name of the file in which the commands are saved.  
  
 
|-
 
|-
Line 211: Line 212:
 
|-
 
|-
 
| 06:13
 
| 06:13
| Let us learn how to run the file as a '''python script.'''
+
| Let us learn how to '''run''' the file as a '''python script.'''
  
We use the '''command percentage run''' to do this.  
+
We use the command '''percentage run''' to do this.  
  
 
|-
 
|-
 
| 06:22
 
| 06:22
| Type '''percentage run space hyphen i space plot underscore script.py''' and press''' Enter.'''
+
| Type: '''percentage run space hyphen i space plot underscore script.py''' and press''' Enter.'''
  
 
|-
 
|-
 
| 06:38
 
| 06:38
|  
+
|Here, '''hyphen i''' parameter '''run'''s the '''code''' written in a '''text editor'''.
Here, '''hyphen i''' parameter runs the code written in a text editor.
+
  
 
The code is run within the current '''ipython''' session.
 
The code is run within the current '''ipython''' session.
Line 240: Line 240:
 
|-
 
|-
 
| 07:07
 
| 07:07
| To view the '''plot''', type''' show()''' on your '''terminal''' and press '''Enter.'''
+
| To view the plot, type''' show()''' on your '''terminal''' and press '''Enter.'''
  
 
|-
 
|-
 
| 07:15
 
| 07:15
| Pause the video here, and try out the following exercise and resume.
+
| Pause the video here and try out the following exercise and resume.
  
 
|-
 
|-
Line 252: Line 252:
 
|-
 
|-
 
| 07:30
 
| 07:30
| Run the '''script''' to produce the '''plot''' and display the same.
+
| '''Run''' the '''script''' to produce the '''plot''' and display the same.
  
 
|-
 
|-
Line 258: Line 258:
 
| Let us look at the solution.  
 
| Let us look at the solution.  
  
We first look at the '''history''' using''' the percentage history hyphen n''' command.
+
We first look at the '''history''' using the''' percentage history hyphen n''' command.
  
 
|-
 
|-
 
| 07:44
 
| 07:44
| Type '''percentage history space hyphen n''' and press''' Enter.'''
+
| Type: '''percentage history space hyphen n''' and press''' Enter.'''
  
 
|-
 
|-
 
| 07:54
 
| 07:54
| Let us clear the plot window
+
| Let us clear the plot window.
  
Type '''clf()''' and press '''Enter'''
+
Type '''clf()''' and press '''Enter'''.
  
 
|-
 
|-
 
| 08:01
 
| 08:01
| Now let us save the '''script''' using the '''command''' '''percentage save'''
+
| Now, let us save the '''script''' using the '''command''' '''percentage save'''.
  
 
|-
 
|-
 
| 08:07
 
| 08:07
| We need lines 2, then 4 to 7 and 16
+
| We need the lines 2, then 4 to 7 and 16.
  
 
|-
 
|-
 
| 08:20
 
| 08:20
| Type '''percentage save space show underscore included.py space 2 space 4 hyphen 7 space 16''' and press''' Enter'''
+
| Type: '''percentage save space show underscore included.py space 2 space 4 hyphen 7 space 16''' and press''' Enter'''.
  
 
|-
 
|-
 
| 08:41
 
| 08:41
| To run the script type
+
| To '''run''' the script, type:
 
   
 
   
'''percentage run space hyphen i space show underscore included.py'''
+
'''percentage run space hyphen i space show underscore included.py''' and press''' Enter'''.
 
+
And press''' Enter'''
+
  
 
|-
 
|-
Line 296: Line 294:
 
|-
 
|-
 
| 09:01
 
| 09:01
| Go to the previous '''command'''.  
+
| Go to the previous command.  
'Modify it by removing ‘'''hyphen i’''' in the '''command''' to, '''percentage run space show  included.py''' and Press '''Enter'''
+
Modify it by removing ‘'''hyphen i’''' in the command to '''percentage run space show  included.py''' and Press '''Enter'''.
 
+
  
 
|-
 
|-
 
| 09:16
 
| 09:16
| We see that it raises a '''NameError''' saying that the name '''linspace''' is not defined.
+
| We see that it raises a '''NameError''' saying that the '''name 'linspace' is not defined'''.
  
This happens because we did not run the script interactively.
+
This happens because we did not '''run''' the script interactively.
  
 
|-
 
|-
 
| 09:30
 
| 09:30
| This brings us to the end of this tutorial. In this tutorial,we have learnt to,
+
| This brings us to the end of this tutorial. In this tutorial, we have learnt to:
  
Retrieve the '''history''' using '''percentage history command.'''
+
retrieve the '''history''' using '''percentage history''' command,
  
 
|-
 
|-
 
| 09:41
 
| 09:41
View only a part of '''history''' by passing argument to''' percentage history command.'''
+
view only a part of '''history''' by passing argument to''' percentage history''' command,
  
 
|-
 
|-
 
| 09:48
 
| 09:48
| Save the required lines of code in required order using '''percentage save command.'''
+
| save the required lines of code, in required order using '''percentage save''' command.
  
 
|-
 
|-
Line 326: Line 323:
 
|-
 
|-
 
| 10:04
 
| 10:04
| Here are some self assessment questions  
+
| Here are some self assessment questions.
  
 
|-
 
|-
Line 348: Line 345:
 
|-
 
|-
 
| 10:40
 
| 10:40
| Which is the command to run the script?
+
| Which is the command to '''run''' the script?
  
 
'''Percentage execute the script name'''
 
'''Percentage execute the script name'''
Line 364: Line 361:
 
|-
 
|-
 
| 10:58
 
| 10:58
| And the solutions are,
+
| And the solutions are-
  
To save the commands 2 3 4 5 7 9 10 11, we issue the '''command percentage save filename 2 hyphen 5 space 7 space 9 hyphen 11'''
+
To save the commands 2 3 4 5 7 9 10 and 11, we issue the command '''percentage save filename 2 hyphen 5 space 7 space 9 hyphen 11'''.
  
 
|-
 
|-
 
| 11:18
 
| 11:18
|  To run the script we use '''percentage run space hyphen i space scriptname'''
+
|  To run the script, we use '''percentage run space hyphen i space scriptname'''.
  
 
|-
 
|-
Line 378: Line 375:
 
|-
 
|-
 
| 11:32
 
| 11:32
| Please post your general queries on Python in this forum.
+
| Please post your general queries on '''Python''' in this forum.
  
 
|-
 
|-
 
| 11:37
 
| 11:37
| The FOSSEE team coordinates the TBC project.
+
| The '''FOSSEE''' team coordinates the '''TBC project'''.
  
 
|-
 
|-
 
| 11:41
 
| 11:41
| Spoken Tutorial Project is funded by NMEICT, MHRD, Govt. of India.
+
| '''Spoken Tutorial''' project is funded by '''NMEICT, MHRD''', Govt. of India.
  
 
For more details, visit this website.
 
For more details, visit this website.
Line 392: Line 389:
 
|-
 
|-
 
|11:52
 
|11:52
| This is Usha from IIT Bombay (or FOSSEE, if you wish) signing off.
+
| This is Usha from '''IIT Bombay''' (or FOSSEE, if you wish), signing off.
  
 
|}
 
|}

Latest revision as of 16:49, 13 June 2019

Time
Narration
00:01 Hello friends and welcome to the Spoken Tutorial on Additional Features of IPython.
00:07 At the end of this tutorial, you will be able to: retrieve your IPython history,
00:14 view a part of the history,
00:17 save a part of a history to a file,
00:21 run a script from within IPython.
00:25 To record this tutorial, I am using:

Ubuntu Linux 14.04 operating system,

00:32 Python 3.4.3,

IPython 5.1.0

00:38 To practice this tutorial, you should know how to

use plots interactively and embellish a plot.

00:48 If not, see the pre-requisite Python tutorials on this website.
00:54 Let us now open the Terminal by pressing Ctrl+Alt+T keys simultaneously.
01:01 Now, type ipython3 and press Enter.
01:07 Let us initialise the pylab package. Type percentage pylab and press Enter.
01:14 To start plotting, type: x is equal to linspace inside the brackets minus 2pi comma 2pi comma 100 and press Enter.
01:31 Next, type: plot inside the brackets x comma xsin(x) and press Enter.
01:42 We got an error saying "xsin is not defined".

This is because xsin(x) is actually x multiplied by sin(x).

01:54 Here, the multiplication sign is missing. So, let us now type:

plot inside the brackets x comma x multiplied by sin(x) and press Enter.

02:13 Next, let us add title and the labels for both x and y axes.
02:19 Type: xlabel inside the brackets inside inverted commas inside dollar sign x and press Enter.
02:31 ylabel inside the brackets inside inverted commas inside dollar sign f(x) .
02:43 title inside the brackets inside inverted commas inside dollar sign x and xsin(x).
02:57 We can now see the labelled plot.
03:01 The history of typed commands can be retrieved by the percentage history command.
03:07 Type: percentage history and press Enter.
03:13 percentage history itself is a command and is displayed as the most recent command.
03:20 Whatever we executed in the terminal, is stored as history.
03:25 If we want to see what was the fifth command, pass 5 as an argument to percentage history command.
03:33 Type: percentage history space 5 and press Enter.

This displays the fifth command which we typed.

03:43 Now, pause the video here and try out the following exercise and resume the video.
03:49 Find out how to list the recent commands between 5 and 10.
03:55 Switch back to the terminal.
03:58 Let us look at the solution.
04:00 Type clf() and press Enter.

Type: percentage history question mark

04:08 Read through the information of percentage history command.
04:13 We can see, percentage history hyphen n 4 hyphen 6 displays the commands from 4 to 6.
04:24 Here, hyphen n is an optional argument which prints the line numbers.

Type q to quit the documentation.

04:37 Now, type: percentage history space 5 hyphen 10 and press Enter.
04:46 To save the history, we use the percentage save command.
04:51 Before we do that, let us first look at the history and identify which lines of code we require.
04:58 Type percentage history and press Enter.
05:03 The second command is linspace.

But the third command is a command that gave us an error.

05:10 Hence we do not need it.
05:13 The commands from fourth to seventh are required.
05:16 So, we need the second command and then the fourth to seventh commands for our program.
05:22 Let us save it in the present working directory. Hence the syntax will be-

percentage save space plot underscore script.py space 2 space 4 hyphen 7 and press Enter.

05:47 The first argument in percentage save command is the name of the file in which the commands are saved.
05:56 The second argument gives the numbers of the commands that are being saved separated by spaces.
06:04 Let us now open the file plot underscore script.py and see the contents.
06:13 Let us learn how to run the file as a python script.

We use the command percentage run to do this.

06:22 Type: percentage run space hyphen i space plot underscore script.py and press Enter.
06:38 Here, hyphen i parameter runs the code written in a text editor.

The code is run within the current ipython session.

06:50 It uses the variables defined interactively in the ipython session.
06:56 The script runs but we do not see the plot.
07:01 This is because when we are running a script, we are not in the interactive mode.
07:07 To view the plot, type show() on your terminal and press Enter.
07:15 Pause the video here and try out the following exercise and resume.
07:21 Use percentage history and percentage save to create a script that has the function show() in it.
07:30 Run the script to produce the plot and display the same.
07:35 Let us look at the solution.

We first look at the history using the percentage history hyphen n command.

07:44 Type: percentage history space hyphen n and press Enter.
07:54 Let us clear the plot window.

Type clf() and press Enter.

08:01 Now, let us save the script using the command percentage save.
08:07 We need the lines 2, then 4 to 7 and 16.
08:20 Type: percentage save space show underscore included.py space 2 space 4 hyphen 7 space 16 and press Enter.
08:41 To run the script, type:

percentage run space hyphen i space show underscore included.py and press Enter.

08:57 We get the desired plot.
09:01 Go to the previous command.

Modify it by removing ‘hyphen i’ in the command to percentage run space show included.py and Press Enter.

09:16 We see that it raises a NameError saying that the name 'linspace' is not defined.

This happens because we did not run the script interactively.

09:30 This brings us to the end of this tutorial. In this tutorial, we have learnt to:

retrieve the history using percentage history command,

09:41 view only a part of history by passing argument to percentage history command,
09:48 save the required lines of code, in required order using percentage save command.
09:55 Use 'percentage run space hyphen i' command to run a saved script.
10:04 Here are some self assessment questions.
10:08 How do you save the command lines 2 3 4 5 7 9 10 and 11?
10:17 percentage save filename 2-5 7 9 hyphen 11
10:25 percentage save filename 2 hyphen 11
10:30 percentage save filename

percentage save 2 hyphen 5 7 9 10 and 11

10:40 Which is the command to run the script?

Percentage execute the script name

10:46 percentage run hyphen i script name

percentage run script name

10:53 percentage execute hyphen i script name
10:58 And the solutions are-

To save the commands 2 3 4 5 7 9 10 and 11, we issue the command percentage save filename 2 hyphen 5 space 7 space 9 hyphen 11.

11:18 To run the script, we use percentage run space hyphen i space scriptname.
11:27 Please post your timed queries in this forum.
11:32 Please post your general queries on Python in this forum.
11:37 The FOSSEE team coordinates the TBC project.
11:41 Spoken Tutorial project is funded by NMEICT, MHRD, Govt. of India.

For more details, visit this website.

11:52 This is Usha from IIT Bombay (or FOSSEE, if you wish), signing off.

Contributors and Content Editors

PoojaMoolya, Sandhya.np14