Jyotisolanki at 08:53, 31 October 2013

2013-10-31T08:53:19Z

Jyotisolanki at 08:47, 31 October 2013

2013-10-31T08:47:25Z

Jyotisolanki: Created page with '{| border=1 !Timing !Narration |- | 0:00 | Hello Friends and Welcome to the tutorial on "getting started with ipython". |- | 0:07 | At the end of this tutorial, you will be abl…'

2013-10-29T11:31:12Z

Created page with '{| border=1 !Timing !Narration |- | 0:00 | Hello Friends and Welcome to the tutorial on "getting started with ipython". |- | 0:07 | At the end of this tutorial, you will be abl…'

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{| border=1
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| 0:00

| Hello Friends and Welcome to the tutorial on "getting started with ipython".

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| 0:07
| At the end of this tutorial, you will be able to,

# invoke the ipython interpreter .
# quit the ipython interpreter.
# navigate the ipython session history.
# use tab-completion for writing ipython functions.
# look-up documentation of functions.
# interrupt incomplete or incorrect commands.

|-
| 0:27
| IPython is an enhanced Python interpreter that provides features like tab-completion, easier access to help and many other functionalities.
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| 0:37
|Let us first see how to start the ipython interpreter.

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| 0:41
| First open the terminal, type ipython in the terminal and hit enter.

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| 0:51
| After getting some information about the version of Python installed and some help commands, we get a prompt with In[1]:.

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| 0:59
|But, if you get an error saying 'ipython is not installed' then refer to the tutorial on how to install the packages.

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| 1:09
| Now, lets see how we can quit the ipython interpreter, press Ctrl-D.

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| 1:17
| A prompt will appear to confirm whether you really want to exit, type y to say yes and quit ipython and n to say no if you don't want to quit the ipython.

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| 1:28
| Press y.

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| 1:32
| Now since we have quit the interpretor, let us start it again by typing ipython

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| 1:42
| And now let's see, how to use the interpreter.

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| 1:46
|Start with the simplest thing, addition.

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| 1:48
|type ''1+2 ''at the prompt.

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| 1:55
|IPython promptly gives back the output as ''3''.

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| 1:59
|Notice that the output is displayed with an Out[1] indication.

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| 2:05
| Now, Let us now try few more operations such as, ''5 minus 3, 7 minus 4, 6 into 5''.

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| 2:23
| Now let's see how the ipython remembers the history of commands.

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| 2:29
|For example ,''print 1+2''.

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| 2:33
|Instead of typing the whole thing,use the up arrow key to go back to the command ''1+2''which we did before, now use the left-arrow key to navigate to the beginning of the line and type the word``print``and press space.

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| 2:55
| We have changed the line to print 1+2, now press enter.

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| 3:02
|The interpreter prints the result as ''3''.

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| 3:06
| Please note that the indication Out square brackets is not shown here.

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| 3:11
| Now let us do print'' 10 into 2''.

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| 3:16
|We use the up arrow key to navigate to the previous command'' 1+2''.

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| 3:22
| Now change ''1 plus 2 to 10 into 2'' and press enter.

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| 3:34
| Till now, we saw how to invoke the ipython interpreter,quit the ipython and navigate through previous commands in ipython.

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| 3:42
|Now, let's see, what is tab-completion?.

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| 3:47
|let's take an example, suppose we want to use the function round.

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| 3:52
| For this we just type ''ro'' at the prompt and press the tab key.

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| 4.00
| As you can see on the terminal, IPython completes the command ''ro'' into round, This feature of ipython is called the tab-completion.

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| 4:08
| Let's see some more possibilities of tab completion just type'' r'' and then press the'' tab''.

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| 4:19
| As you can see that IPython does not complete the command. This is because, there are many possibilities of ''r'' therefore it just lists out all the possible completions of r.

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| 4:31
| Now let's try out an exercise.

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| 4:33
| Pause the video,solve the problem and resume the video.

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| 4:39
| 1. find out the commands starting with "ab"?

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| 4:44
| 2. list out the commands starting with "a"?

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| 4:54
|'' ab'' tab completes to''abs'' and ''a tab gives us a list of all the commands starting with a.

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| 5:07
| Now, let's see what the functions abs is used for.

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| 5:12
| We will use the help features of ipython to find out this.

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| 5:15
| To see the documentation of a function, type the function name followed by a question mark and hit enter.

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| 5:24
| Ipython interpreter will show the documentation for the function.

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| 5:27
| Let us see the documentation of the function abs, type abs? and press enter

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| 5:38
| As the documentation says, ''abs'' accepts a number as an input and returns it's absolute value.

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| 5:46
|lets see few examples,

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| 5:49
|Type ''abs(-19)'' and'' abs(19)'' on the interpreter.

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| 6:04
|We get ''19'', as expected, in both the cases.

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| 6:08
| Now lets try it for decimal numbers; lets try'' abs(-10.5)'', we got ''10.5'' as the result.

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| 6:24
| Pause the video here, try out the following exercise and resume the video.

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| 6:31
|Look-up the documentation of ''round'' and see how to use it.

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| 6:39
| And you can look up the documentation of the function round by typing round ''question mark'' in the ipython interpreter.

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| 6:47
| If you notice, there are extra square brackets around ''ndigits''.

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| 6:53
| This means that ''ndigits'' is optional and 0 is the default value.

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| 6:58
| Optional parameters are shown in square brackets in Python documentation.

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| 7:03
|A function ''round'', rounds a number to a given precision.

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| 7:09
| Pause the video here, try out the following exercise and resume the video.

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| 7:16
| let us now try few more examples with the function round.

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| 7:21
| Check the output of ''round(2.48) round(2.48, 1) round(2.48, 2) round(2.484) round(2.484, 1) round(2.484, 2)''

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| 7:43
| Now, we got'' 2.0, 2.5 and 2.48'', which are what we expect.

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| 7:54
| Let's now see how to correct typing errors, which we often make while typing at the terminal.

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| 08.01
| As already shown, if we haven't hit the enter key already, we could navigate using the arrow keys and make deletions using delete or backspace key and correct the errors.

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| 8:12
|let us make a typing error deliberately, type round(2.484 and hit enter, without closing the parenthesis.

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| 8:25
| We get a prompt with ''dots'' .

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| 8:28
|This prompt is the continuation prompt of ''ipython''.

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| 8:32
| It appears when, the previous line is incomplete.

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| 8:36
| now complete the command of the same examples with close parenthesis and press enter.

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|8:49
|We got the expected output that is ''2.0''

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| 8:51
| In other instances, if we commit a typing error with a longer and more complex expression and end up with the continuation prompt, we can type Ctrl-C to interrupt the command and get back to the ipython input prompt.

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| 9:15
| Pause the video here, try out the following exercise and resume the video.

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| 9:22
| 1.type round(2.484, and press enter. and then cancel the command using ''Ctrl-C''.

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| 9:45
| 2. type the command, round(2.484, 2)

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| 10:09
| Now, let us revise quickly what we learn't today. In this tutorial,we learn't to,

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| 10:15
| 1. Invoke the ipython interpreter by typing ipython.

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| 10:20
| 2. To quit the ipython interpreter by using ctrl-d.

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| 10:22
| 3. To navigate in the history of ipython by using the arrow keys.

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| 10:28
| 4. What is tab-completion

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| 10:30
| 5. To see the documentation of functions using question mark.

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| 10:34
| 6. To Interrupt using ctrl-c when we make an error.

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| 10:39
| Here are some self assessment questions for you to solve

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| 10:44
| '''ipython is a programming language similar to Python.

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| 10:50
|''' True or False''

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| 10:53
| Second one. Which key combination quits ipython ? '' Ctrl + C Ctrl + D Alt + C Alt + D''

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| 11:03
| And The last one. Which character is used at the end of a command, in Ipython to display the documentation. under score'' (_) ''question mark'' (?)'' exclamation mark'' (!)'' ampersand ''(&)''

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| 11:16
| And the answers are,

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| 11:18
| Ipython is not a programming language, it is just an interpreter.

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| 11:23
| Second one is We use ''Ctrl D'' to quit Ipython interpreter.

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| 11:27
| The final one is We use ? at the end of the function name to display its documentation.

|-
| 11:36
| So we hope you have enjoyed this tutorial and found it useful.

|-
|11:39
|Thank you!

|}

Python/C2/Getting-started-with-ipython/Gujarati - Revision history

Jyotisolanki at 08:53, 31 October 2013

Jyotisolanki at 08:47, 31 October 2013

Jyotisolanki: Created page with '{| border=1 !Timing !Narration |- | 0:00 | Hello Friends and Welcome to the tutorial on "getting started with ipython". |- | 0:07 | At the end of this tutorial, you will be abl…'