[Tutor] Help me make it look pretty!

[John CORRY]

Good evening all.
 
I am writing a program using python 2.4, glade 2 and pygtk.  It takes
input from the user using textentry boxes.  The input should be a
number.  When the user keys the data in, it automatically left
justifies.  The function below, takes the input for four boxes and right
justifies it by using an ugly, string format.  The boxes are 45
characters big, so I use the len function to fit them into the box.  The
code is below.
 
I am looking for a way to set the text entry up, so that there is a
decimal point in the box regardless of what the user does and I am also
looking for a way to keep the numbers right justified.
 
Any suggestions or comments as always are greatly appreciated.
 
Regards,
 
John.
 
 
def
callback36(self,data,text37,text38,text39,text40,text41,text42,label):
        a = text37.get_text()
        
        b = text38.get_text()
        c = text39.get_text()
        d = text40.get_text()
        a= float(a)
        b= float(b)
        c= float(c)
        d= float(d)
        
        try:
            
            e = float(a + b + c + d)
            g = e/a
            e = "%0.2f" % e
            
            g = "%0.2f" % g
            g = str(g)
            label.hide()
            e = "                                         %s" % e
            a = "                                         %s" % a
            b = "                                         %s" % b
            c = "                                         %s" % c
            d = "                                         %s" % d
            g = "%s%%" % g
            text42.set_text(str(g)) 
            if len(e)>45:
                x = len(e) - 45
                x = x + 4
                y = e[x:]
                text41.set_text(str(y))               
                return 
            else:
                text41.set_text(str(e)) 
                return
       
        except:
            label.show()
            return
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