Major changes to script of 'using python modules'.

1 files changed, 283 insertions, 39 deletions

diff --git a/using_python_modules/script.rst b/using_python_modules/script.rst
index 0b0858b..9f95682 100644
--- a/using_python_modules/script.rst
+++ b/using_python_modules/script.rst
@@ -27,75 +27,161 @@
 ====================
 Using Python modules
 ====================
-{{{ show the welcome slide }}}
 
-Welcome to the spoken tutorial on Using Python Modules.
+.. L1
 
-{{{ switch to next slide, outline slide }}}
+{{{ Show the  first slide containing title, name of the production
+team along with the logo of MHRD }}}
 
-In this tutorial, we will see how to run python scripts from command
-line. We'll see how to import modules, importing scipy and pylab
-modules and have a look at the Python standard library.
+.. R1
 
-{{{ switch to next slide on executing python scripts from command line }}}
+Hello Friends and Welcome to the spoken tutorial on 
+'Using Python Modules'.
+
+.. L2
+
+{{{ switch to objectives slide }}}
+
+.. R2
+
+At the end of this tutorial, you will be able to ,
+
+ 1. Execute python scripts from command line.
+ #. Use import in scripts.
+ #. Import scipy and pylab modules.
+ #. Use python standard modules and 3rd party modules.
+
+.. L3
+
+{{{ Switch to the pre-requisite slide }}}
+
+.. R3
+
+Before beginning this tutorial,we would suggest you to complete the 
+tutorial on "Using plot interactively", "Embellishing a plot" and 
+"Saving plots".
+
+.. L4
+
+{{{ switch to next slide on running python scripts from 
+command line }}}
+
+.. R5
 
 Let us create a simple python script to print hello world. Open your
 text editor and type the following,
 
+.. L6
+
 {{{ open the text editor and type the following }}}
 ::
 
     print "Hello world!"
     print
 
-and save the script as ``hello.py``,
+.. R6
+
+.. R7
+
+Now save this script as ``hello.py``,
+
+.. L7
 
 {{{ save the script as hello.py }}}
 
-Till now we saw how to run a script using the IPython interpreter
-using the
+.. R8
+
+Start the ipython interpreter
+
+.. L8
+
+{{{ Open the terminal }}}
+::
+
+    ipython
+
+.. R9
+
+In the previous tutorials,we have seen how to run a script using 
+the IPython interpreter using ``%run``
+
+.. L9
 ::
 
     %run -i hello.py
 
-option, but that is not the correct way of running a python
+.. R10
+
+but this is not the correct way of running a python
 script. 
 
+.. L10
+
+{{{ Close the terminal }}}
+
+.. R11
+
 The correct method is to run it using the Python interpreter. Open the
 terminal and navigate to the directory where hello.py is,
 
+.. L11
+
 {{{ open terminal and navigate to directory where hello.py was saved }}}
 
-{{{ switch to next slide }}}
+.. R12
 
 now run the Python script as,
+
+.. L12
 ::
 
     python hello.py
 
+.. R13
+
 It executed the script and we got the output ``Hello World!``.
 
+.. L13
+
+.. L14
+
+{{{ switch to next slide }}}
 {{{ highlight ``python filename`` syntax on slide while narrating }}}
 
-The syntax is python space filename.
+.. R14
+
+The syntax is ``python space filename``.
+
+.. L15
 
 {{{ switch to next slide, four plot problem }}}
 
-Now recall the four plot problem where we plotted four plots in a single
-figure. Let us run that script from command line.
+.. R15
+
+Now, we have a four plot problem where we have plotted four plots in a 
+single figure. Let us run that script from command line.
+
+.. R16
+
+If you don't have the script, then make one with the following set of 
+commands
 
-If you don't have the script, 
+.. L16
 
-{{{ open the four_plot.py file in text editor }}}
+{{{ open the four_plot.py file in text editor and show }}}
+{{{ Pause for some time and then continue }}}
 
-just pause here and create a python script with the following lines
-and save it as four_plot.py.
+.. R17
 
 Now let us run four_plot.py as a python script.
+
+.. L17
 ::
 
     python four_plot.py
 
+.. R18
+
 Oops! even though it was supposed to work, it didn't. It gave an error
 ``linspace()`` is not defined, which means that the function
 ``linspace()`` is not available in the current name-space.
@@ -109,48 +195,88 @@ starts. And thus we don't have to explicitly import modules.
 So now let us try to fix the problem and run the script in command
 line,
 
+.. L18
+
+.. L19
+
 {{{ switch to next slide, fix ``linspace`` problem }}}
 
-add the following line as the first line in the script,
+.. R19
+
+add this line as the first line in the script,
+
+.. L20
+
 {{{ add the line as first line in four_plot.py and save }}}
 ::
 
     from scipy import *
 
+.. R20
+
+.. R21
+
 Now let us run the script again,
+
+.. L21
 ::
 
     python four_plot.py
 
-Now it gave another error -- plot not defined, let us edit the file
-again and add the line below the line we just added,
+.. R22
+
+Now it gave another error -- plot not defined, 
+
+.. L22
+
+.. L23
 
 {{{ switch to next slide, fix ``plot`` problem }}}
 
+.. R23
+
+let us edit the file again and add this line as the 
+second line in our script and save it,
+
+.. L24
+
 {{{ add the line as second line in four_plot.py and save }}}
 ::
 
     from pylab import *
 
-And run the script,
+.. R24
+
+.. R25
+
+And now, run the script,
+
+.. L25
+
+{{{ Switch to the terminal }}}
 ::
 
     python four_plot.py
 
+.. R26
+
 Yes! it worked. So what did we do?
 
 We actually imported the required modules using the keyword ``import``.
-It could have also be done as,
+It could also be done as by using,
+
+.. L26
+
+.. L27
 
 {{{ switch to next slide, better way of fixing }}}
+{{{ highlight the required line while narrating }}}
 
-{{{ highlight the following in slide and say it loud }}}
-::
+.. R27
 
     from scipy import linspace
 
 instead of,
-::
 
     from scipy import *
 
@@ -159,9 +285,19 @@ asterisk or star. If we use asterisk to import from a particular
 module then it will replace any existing functions with the same name
 in our name-space.
 
+.. L28
+
 {{{ switch to next slide, Instead of ``*`` }}}
 
+.. R28
+
 So let us modify four_plot.py as,
+Hence we delete the first two lines of our code which we had added
+and add these lines
+
+.. L29
+
+{{{ Switch to script 'four_plot.py' }}}
 {{{ delete the first two lines and add the following }}}
 ::
 
@@ -169,46 +305,89 @@ So let us modify four_plot.py as,
     from pylab import plot, legend, annotate
     from pylab import xlim, ylim, title, show
 
+.. R29
+
+.. R30
+
 Now let us try running the code again as,
+
+.. L30
 ::
 
     python four_plot.py
 
+.. R31
+
 It works! In this method we actually imported the functions to the
-current name-space, and there is another method of doing it. And that
+current name-space.There is one more way of doing it. And that
 is,
 
-{{{ switch to next slide }}}
+.. L31
+
+.. L32
+
+{{{ switch to slide 'another fix' }}}
+{{{ highlight the required line while narrating }}}
+
+.. R32
 
 Notice that we use ``scipy.pi`` instead of just ``pi`` as in the
 previous method, and the functions are called as ``pylab.plot()`` and
 ``pylab.annotate()`` and not as ``plot()`` and ``annotate()``.
 
-{{{ switch to next slide, problem statement }}}
+Pause the video here, try out the following exercise and resume the video.
+
+.. L33
 
-%% %% Write a script to plot a sine wave from minus two pi to two pi.
+{{{ Show slide with exercise 1 }}}
 
-Pause here and try to solve the problem yourself before looking at the
-solution.
+.. R33
 
+ Write a script to plot a sine wave from minus two pi to two pi.
+<Pause>
 It can solved as,
 
+.. L34
+
 {{{ open sine.py and show it }}}
 
-the first line we import the required functions ``linspace()`` and
-``sin()`` and constant ``pi`` from the module scipy. the second and
+.. R34
+
+The first line we import the required functions ``linspace()`` ,
+``sin()`` and constant ``pi`` from the module scipy. The second and
 third line we import the functions ``plot()``, ``legend()``,
 ``show()``, ``title()``, ``xlabel()`` and ``ylabel()``. And the rest
 the code to generate the plot.
 
+.. L35
+
+{{{ Pause for sometime and then continue }}}
+
+.. R35
+
+.. R36
+
 We can run it as,
-{{{ now switch focus to terminal and run the script }}}
+
+.. L36
+
+{{{ Switch to the terminal }}}
 ::
 
     python sine.py
 
+.. R37
+
+As we can see, we our sine plot.Let us move further in our topic.
+
+.. L37
+
+.. L38
+
 {{{ switch to next slide, What is a module? }}}
 
+.. R38
+
 Until now we have been learning about importing modules, now what is a
 module?
 
@@ -216,8 +395,12 @@ A module is simply a file containing Python definitions and
 statements. Definitions from a module can be imported into other
 modules or into the main module.
 
+.. L39
+
 {{{ switch to next slide, Python standard library }}}
 
+.. R39
+
 Python has a very rich standard library of modules. It is very
 extensive, offering a wide range of facilities. Some of the standard
 modules are,
@@ -236,12 +419,73 @@ Find more information at Python Library reference,
 There are a lot of other modules like pylab, scipy, Mayavi, etc which
 are not part of the standard python library.
 
+.. L40
+
 {{{ switch to next slide, summary }}}
 
-This brings us to the end of this tutorial, in this tutorial we
-learned running scripts from command line, learned about modules, saw
-the python standard library.
+.. R40
+
+This brings us to the end of this tutorial. In this tutorial, we have
+learnt to,
+
+ 1. Run scripts from command line, 
+ #. Import modules by specifying the module name followed by  
+    an asterisk. 
+ #. Import only the required functions from modules by specifying 
+    the function name.
+ #. Use python standard library.
+
+.. L41
+
+{{{Show self assessment questions slide}}}
+
+.. R41
+
+Here are some self assessment questions for you to solve
+
+1. Which among this is correct ? 
+
+   - from scipy import plot
+   - from numpy import plot
+   - from matplotlib import plot
+   - from pylab import plot
+   
+2. Which among these libraries is part of python standard library ?
+
+   - Mayavi
+   - scipy
+   - matplotlib
+   - urllib2
+
+3. Functions ``xlim()`` and ``ylim()`` can be imported to the current
+   name-space as,
+
+   - from pylab import xlim, ylim
+   - import pylab
+   - from scipy import xlim, ylim
+   - import scipy
+
+.. L42
+
+{{{solution of self assessment questions on slide}}}
+
+.. R42
+
+And the answers,
+
+1. The option ``from pylab import plot`` is the correct one, since plot 
+   is a function of module module.
+
+2. ``urllib2`` is a part of the python standard library.
+
+3. Functions ``xlim()`` and ``ylim()`` can be imported to the current
+   name-space as, ``from pylab import xlim, ylim``.
+
+.. L23
 
 {{{ switch to next slide, thank you slide }}}
 
+.. R43
+
+Hope you have enjoyed this tutorial and found it useful.
 Thank you!