getting-started-ipython/script.rst
author Puneeth Chaganti <punchagan@fossee.in>
Thu, 07 Oct 2010 12:28:12 +0530
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child 246 95e7682e9d43
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Cleaned up script for getting started with files LO.
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.. Objectives
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.. ----------
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.. Clearly state the objectives of the LO (along with RBT level)
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.. Prerequisites
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.. -------------
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..   1. Name of LO-1
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..   2. Name of LO-2
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..   3. Name of LO-3
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.. Author              : Puneeth 
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   Internal Reviewer   : 
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   External Reviewer   :
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   Checklist OK?       : <put date stamp here, if OK> [2010-10-05]
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Script
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------
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{{{ Show the slide containing title }}}
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Hello Friends and Welcome to the tutorial on getting started with
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``ipython``. 
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{{{ Show slide with outline of the session. }}}
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This tutorial will cover the basic usage of the ``ipython``
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interpreter. The following topics would be covered.
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IPython is an enhanced Python interpreter that provides features like
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tabcompletion, easier access to help and many other functionalities
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which are not available in the vannila Python interpreter.
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First let us see how to invoke the ``ipython`` interpreter.
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We type
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::
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  ipython
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at the terminal prompt to invoke the ipython interpreter.
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We get a prompt with ``In [1]:`` after getting some information about
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the version of Python installed and some help commands.   
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If you get an error saying something like ``ipython is not
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installed``, refer to the tutorial on how to install the packages
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required for this course.
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Now, to quit the ipython interpreter, type Ctrl-D.  You are prompted
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asking if you really want to exit, type y to say yes and quit ipython.
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Start ipython again, as you did before.
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The prompt that you have says ``In [1]``. ``In`` stands for input and the
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ipython interpreter is ready to accept input from you.
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Now let us see, how we can type some commands into the interpreter.
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Start with the simplest thing, addition.
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Let's type 
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::
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  1+2 
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at the prompt. IPython promptly gives back the output as 3.  Notice
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that the output is displayed with an ``Out[1]`` indication.
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Let's try out few other mathematical operations.
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::
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  5 - 3
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  7 - 4
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  6 * 5
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Now let's ``print 1+2``. Instead of typing the whole thing, we make
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use of the fact that IPython remembers the history of the commands
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that you have already used. We use the up arrow key to go back the
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command ``1+2``. We then use the left-arrow key to navigate to the
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beginning of the line and add the word ``print`` and a space. Then hit
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enter and observe that the interpreter prints out the value as 3,
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without the Out[] indication.
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Now, let's change the previous command ``print 1+2`` to ``print
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10*2``.  We use the up arrow again to navigate to the previous command
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and use the left arrow key to move the cursor on to the + symbol and
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then use the delete key to remove it and type 0 and * to change the
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expression to the required one.  We hit enter to see the output of
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``print``. 
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Now, let's say we want to use the function ``round``. We type ``ro``
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at the prompt and hit the tab key. As you can see, the IPython
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completes the command. This feature is called the tab-completion.
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Now, we remove all the characters and just type ``r`` and then hit
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tab. IPython does not complete the command since there are many
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possibilities. It just lists out all the possible completions.
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%% %% Pause the video here and type ``ab`` and hit tab to see what
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happens. Next, jut type ``a`` and hit tab to see what happens. 
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``ab`` tab completes to ``abs`` and ``a<tab>`` gives us a list of all
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the commands starting with a. 
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Now, let's see what these functions are used for.  We will use the
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help features of ipython to find this out.
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To get the help of any function, we first type the function, ``abs``
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in our case and then add a ? at the end and hit enter.
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As the documentation says, ``abs`` accepts a number as an input and
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returns it's absolute value.
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We say, 
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::
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  abs(-19)
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  abs(19)
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We get 19, as expected, in both the cases.  
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Does it work for decimals (or floats)?  Let's try typing abs(-10.5)
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and we do get back 10.5.
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Following is an (are) exercise(s) that you must do. 
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%%1%% Look-up the documentation of ``round`` and see how to use it.
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Please, pause the video here. Do the exercises and then continue. 
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::
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 round?
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If you notice, there are extra square brackets around the ``ndigits``.
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This means that ``ndigits`` is optional and 0 is the default value.
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Optional parameters are shown in square brackets anywhere in Python
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documentation.
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The function ``round``, rounds a number to a given precision.
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%% %% Pause the video here and check the output of
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round(2.48)
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round(2.48, 1)
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round(2.48, 2)
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and then resume the video. 
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::
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  round(2.484)
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  round(2.484, 1)
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  round(2.484, 2)
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We get 2.0, 2.5 and 2.48, which are what we expect. 
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Let's now see how to correct typing errors that we make when typing at
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the terminal. As already shown, if we haven't hit the enter key
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already, we could navigate using the arrow keys and make deletions
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using delete or backspace key and correct the errors. 
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Let's now type round(2.484 and hit enter, without closing the
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parenthesis. We get a prompt with dots.  This prompt is the
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continuation prompt of ``ipython``.  It appears, the previous line is
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incomplete in some way.  We now complete the command by typing, the
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closing parenthesis and hitting enter.  We get the expected output of
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2.5. 
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In other instances, if we commit a typing error with a longer and more
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complex expression and end up with the continuation prompt, we can
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type Ctrl-C to interrupt the command and get back the ``ipython`` input
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prompt.
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Following is an exercise that you must do. 
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%%2%% Try typing round(2.484, and hit enter. and then cancel the
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command using Ctrl-C. Then, type the command, round(2.484, 2) and
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resume the video.
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Please, pause the video here. Do the exercises and then continue. 
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::
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  round(2.484 
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  ^C
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  round(2.484, 2)
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This brings us to the end of the tutorial on getting started with
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``ipython``.
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In this tutorial we have learnt
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{{{ show the outline/summary slide. }}}
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{{{ Show the "sponsored by FOSSEE" slide }}}
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This tutorial was created as a part of FOSSEE project, NME ICT, MHRD India
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Hope you have enjoyed and found it useful.
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Thank you!
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