[Tutor] Problems with GUI calling a class

David Holland davholla2002 at yahoo.co.uk
Sat Oct 16 17:32:44 CEST 2004

 I wrote a program to calculate the likely result of a
one day cricket match and then decided to make it into
a class and have another class for a GUI.
It all works well but I can not call the function from
the first class from the GUI class, insteading of
returning a result it just gives this error 'Exception
in Tkinter callback
Traceback (most recent call last):
  File "/usr/lib/python2.3/lib-tk/Tkinter.py", line
1345, in __call__
    return self.func(*args)
line 194, in cricket_getinfo
UnboundLocalError: local variable 'results' referenced
before assignment
This is the code which create the GUI and if it worked
would call the calculations.
    def cricket_getinfo(self):
        """Get values from the GUI and submit for
        print "test"
        runs = self.runs_ent.get()
        wickets = self.wickets_ent.get()
        overs = self.overs_ent.get()
        if self.yes_no.get():
            used_before = 'Y'
            used_before = 'N'
        Cricketobj = Cricket()
        #create code to call the calculations
        z = 50
        win = 10
        if self.yes_no == 'N':
            win = 10
            originalscore = 0
            wold = 0
            yold = 0
            results =
Cricketobj.runfuns(wickets,overs,runs,z, win,
originalscore, orignovoers, wold, yold)
            print results
        elif self.yes_no == 'Y':
        #get the data from last time
            xold, yold, wold = openlasttime()
        #now we are calculating using the more up to
date run rate
            orignovoers = y
            runs = int(runs)
            xold = int(xold)
            x = x - xold
            overs = int(overs) - int(yold)
            wickets = int(wickets) - int(wold)
            wold = int(wold)
            win = 10
            z = 50
            results =
Cricketobj.runfuns(wickets,overs,runs,z, win,
originalscore, orignovoers, wold, yold)#(w,y,x,z,win,
xold, orignovoers, wold, yold)
        #the line below is causing it crash
        #results = 1

Can anyone see why I am not calling the class's
function properly ?

Thanks in advance.

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