Please help with problem creating class

[auzarski2008 at gmail.com]

Hi I have been working on a homework assignment that I am having a lot
of trouble with.  I am so frustrated because every time I think I am
getting close to figuring it out there is another problem.   If you
could look at this and tell me what I am doing wrong I would very much
appreciate it....

import string

from datetime import date



class Leaderapplicant:



        def __init__(self, line):

                #convert the lines of data into fields and removes
\n

                line = line.rstrip("\n")

                appname, leadername, start, end = line.split("\t")



                self.appname = appname

                self.leadername = leadername





                yyyy, mm, dd = start.split(",")  #splits the string
into dates

                b = int(yyyy)

                c = int(mm)

                d = int(dd)

                self.start = date(b,c,d)





                yyyy, mm, dd = end.split(",")

                b = int(yyyy)

                c = int(mm)

                d = int(dd)

                self.end = date(b, c, d)





        def getAppname(self):

                return self.appname



        def getLeadername(self):

                return self.leadername



        def getStart(self):

                return self.start



        def getEnd(self):

                return self.end



        def getSomething(self):

        # infoStr is a tab separated line: name leadername startdate
enddate



                return self.appname + "\t" + self.leadername + "\t" +
self.start + "\t" + self.end



#import Leader Applicant



def get_files():
        infile = raw_input("What file is the data in? ")
        outfile = raw_input("What file would you like the data to go
in? ")
        return infile, outfile




def main():


#recall get_files function
        files = get_files()

#open files
        infile = open(files[0], 'r')
        outfile = open(files[1], 'w')


        reportstart = raw_input("Please enter the date (yyyy, mm, dd)
the reporting period started: ")

        yyyy, mm, dd = string.split(reportstart, ",")

        yyyy = int(yyyy)

        mm  = int(mm)

        dd  = int(dd)

        reportstartdate= date(yyyy, mm, dd)



        reportend = raw_input("Please enter the date (yyyy, mm, dd)
the reporting period ended: ")

        yyyy, mm, dd = string.split(reportend, ",")

        yyyy = int(yyyy)

        mm = int(mm)

        dd = int(dd)

        reportenddate = date(yyyy, mm, dd)





        for line in infile:



                a = Leaderapplicant(line) #from data file



                if a.getEnd() >= reportstartdate and a.getEnd() <=
reportenddate:



                        outfile.write(a.getAppname())

                        outfile.write
("\n")





#close files



                        infile.close()

                        outfile.close()



        #print "The list has been written to", files[1]





if __name__ == '__main__':

        main()






I am using tab separated data in another file that looks like this...


appname1   leadername1    2005, 02, 02    2006, 02, 02
appname2   leadername2    2006, 03, 21    2007, 06, 28

etc...

The error message looks like this....

 back (most recent call last):
  File "/home/amy/Documents/LIS452/assignment 3/testworks.py", line
97, in <module>
    main()
  File "/home/amy/Documents/LIS452/assignment 3/testworks.py", line
80, in main
    a = Leaderapplicant(line) #from data file
  File "/home/amy/Documents/LIS452/assignment 3/testworks.py", line 9,
in __init__
    appname, leadername, start, end = line.split("\t")
ValueError: need more than 3 values to unpack

Any help would be greatly appreciated.  I have spent so much time on
this that I am behind not only in this class but in other classes as
well.