ThyArmageddon sharevalue 20130712-161531

#!/usr/bin/env python
"""
This python script will use the API modules
availables to check the value of a specific
ticker online and return it
"""

import sys
from YahooAPI import YFinance


if __name__ == '__main__':
    """
    We start by testing the number of arguments
    and exit if the number of arguments is less
    than 2
    """

    if len(sys.argv) != 2:
        print """
        Incorrect argument length

        Usage:
        sharevalue.py <ticker>
        """
        sys.exit(1)

    """
    We create a class from the Yahoo API
    We set the ticker argv[1]
    We ask for the value of the market
    """
    finance = YFinance()
    finance.link = sys.argv[1]
    value = finance.value

    """
    We test if value is set first
    if it is not we exit because the ticker is wrong
    We, then, test if value is set to -1
    if it is we exit because we couldn't connect
    """
    if not value:
        print """
        You submitted a ticker that doesn't exist
        Please try a different ticker than %s
        """ % (sys.argv[1])
        sys.exit(1)
    if value == -1:
        print """
        We were able to connect to the website
        The website might be down
        Please check your connection and try again.
        """
        sys.exit(1)

    """
    If everything goes well, we print the value
    """
    print """
        The current value of %s is %.2f
    """ % (sys.argv[1], value)

"""
Yahoo API Module
================

YahooFinance Class
------------------
This class will save the ticker in a correct link format
and will output the correct value when value is called

"""

import urllib2


class YFinance(object):

    """
    The YahooAPI has a correct link
    and the value returned from Yahoo Finance
    """

    def __init__(self):
        """
        The default link is None
        """
        self._link = None

    @property
    def link(self):
        """
        This will return the link when needed
        to access the website and get the value
        """
        return self._link

    @property
    def value(self):
        """
        We try to connect to the link
        if everything goes well, we get the value
        we check if the value is not 0 and return it
        if we can't connect we will return -1
        """
        try:
            fobj = urllib2.urlopen(self._link)
            data = fobj.read()
            value = float(data)
            fobj.close()
            if value == 0.0:
                return
            return value

        except IOError:
            return -1

    @link.setter
    def link(self, ticker):
        """
        The link recieves a ticker and saves it as a link
        The link will be used later to get the information
        from the web page.
        """
        link = "http://download.finance.yahoo.com/d/quotes.csv?s=%s&f=l1" \
            % ticker
        self._link = link

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