rahulc93 myshellv1 20130718-175959

Source

The code for the problem can be found here

Solution

The solution to the above problem is given below.

from cmd2 import Cmd
import requests
import pwd

__version__ = '0.1'

class Application(Cmd):
    """
    The main Application class
    """

    def __init__(self):
        Cmd.__init__(self)

    def do_hello(self, line):  # defining the 'hello' command
        print "Hello:", line  # executing the instructions for the command

    def do_sayit(self, line):  # defining the 'sayit' command
        print "Python rocks!"  # executing the instructions for the command

    def do_stock(self, line):  # defining the 'stock' command
        get_stock()  # calling the 'get_stock' method to execute the command

    def do_greet(self, line):  # defining the 'greet' command
        print_user()  # calling the 'print_user' method to execute the command


def get_stock():
    """
    This function uses the requests module and extracts the share price from the recquired URL according to the NASDAQ value given by the user
    """

    nasdaq = raw_input("Enter NASDAQ code: ")  # taking the NASDAQ code as input from the user
    url = "http://download.finance.yahoo.com/d/quotes.csv?s=%s&f=l1" \
        % (nasdaq)  # the recquired URL from which the share price shall be obtained
    value = requests.get(url).text  # storing the share price from the URL in 'value'
    if value == 0:  # incorrect NASDAQ code provided
        print "Incorrect NASDAQ symbol."  # generate error message
    else:  # share price has been obtained
        print "The current share value is ", value  # display the value

def print_user():
    """
    This function uses the pwd module and will print the name of the user currently logged in
    """

    total_list = pwd.getpwall()  # a list of all password database entries
    for x in total_list:  # iterating through the list
        if x[5].find('home') == 1:  # the entry for the user has been found
            print "Hello %s" % x[0]  # print the user name
            break  # exit from the loop


if __name__ == '__main__':
    app = Application()
    app.cmdloop()

Run the program

To run the program, save it as psh.py, and:

$ python psh.py