.. link: http://dgplug.org/summertraining/2013/posts/m0rin09ma3-planetparser-20130714-163119.html
.. description: 
.. tags: 
.. date: 2013/07/14 16:31:20
.. title: m0rin09ma3 planetparser 20130714-163119
.. slug: m0rin09ma3-planetparser-20130714-163119

Sharevalue
===========

This program will print the last traded price of the company whose symbol is given to the program as command-line arguments like::

    $ python sharevalue.py GOOG YHOO ...

A link to the `source code`_.

.. _source code: https://github.com/m0rin09ma3/python-summer-training-2013/blob/master/sharevalue/sharevalue.py

Sample outputs:
----------------

.. code-block::

    $ python sharevalue.py GOOG YHOO
    GOOG    YHOO    
    920.24  27.04


Explanation
------------

In the main function, take command-line arguments and construct url string.

.. code-block:: python

    n_argc = len(sys.argv)
    if n_argc < 2:
        print 'please specify symbol and try again.'
        print 'e.g. sharevalue.py GOOG YHOO ...'
        return 1
    #print n_argc

    l_symbol = []
    l_symbol = [ sys.argv[n] for n in range(1, n_argc) ]
    #print l_symbol

    # s_symbol = 's=GOOG&s=YHOO&...'
    s_symbol = ""
    s_symbol = '&'.join( [ 's=' + l_symbol[n] for n in range(n_argc - 1) ] ) 
    #print s_symbol

    s_url = ""
    s_url = 'http://download.finance.yahoo.com/d/quotes.csv?' + \
    s_symbol + \
    '&f=l1'
    #print s_url


Retrieve data from the URL and store them into a list.

.. code-block:: python

    try:
        f = urllib2.urlopen(s_url)
    except urllib2.URLError:
        print 'failed to open url', s_url
    else:
        l_quote = []
        l_quote = f.readlines() # e.g. ['920.24\r\n', '27.04\r\n']
        f.close()
    #print l_quote


Format strings and output.

.. code-block:: python

    print "%s".ljust(6) % '\t'.join(l_symbol)
    l_quote = [ s.strip() for s in l_quote ]
    print "%6s" % '\t'.join(l_quote)