[Tutor] Code with traceback...Re: Help me.. problem in building calculator application

[Kent Johnson]

Immediately following the line
         self.str1 = StringVar()

you have
         self.str1 = "0"

at which point self.str1 is a string, not a StringVar. Maybe you mean
	self.str1.set("0")
?

Kent

Asrarahmed Kadri wrote:
>  
> Traceback is as under:
>  
> Traceback (most recent call last):
>   File "C:\python\lib\lib-tk\Tkinter.py", line 1345, in __call__
>     return self.func(*args)
>   File "calculator_version2.py", line 105, in <lambda>
>     self.buttonPlu = Button(self.container3,text='+',command = lambda: 
> self.oprC
> lick('+',self.str1.get()))
> AttributeError: 'str' object has no attribute 'get'
> 
>  
> 
> from Tkinter import *
> import string
> 
> 
> class Mycalc:
> 
>     def buttonClick(self,str2,str3):
>             if str2 == ".":
>                 if self.dotFlag:
>                     pass
>                 else:
>                     self.dotFlag = True
>                     self.operand = str3 + str2
>             else:
>                 self.operand = str3 + str2
>            
> 
> 
>     def oprClick(self,str11,oprt):
> 
>         self.dotFlag = False
>        
>         if oprt == "+":
>             if self.result == "0":
>                 self.result = str11
>             else:
>                 self.result = string.atof(self.result) + string.atof(str11)
>                
>            
>            
>         elif oprt == "-":     
>             if self.result == "0":
>                 self.result = str11
>             else:
>                 self.result = string.atof(self.result) - string.atof(str11)
>                
> 
>         elif str2 == "*":
>             if self.result == "0":
>                 self.result = str11
>             else:
>                 self.result = string.atof(self.result) * string.atof(str11)
>                
>        
>         elif str2 == "/":
>             if self.result == "0":
>                 self.result = str11
>             else:
>                 self.result = string.atof (self.result) / string.atof(str11)
>                
> 
>         self.entryWidget.icursor(0)
>         self.entryWidget.delete(0,END)
>         self.entryWidget.insert(INSERT,self.result)
> 
>        
> 
>                    
> 
>     def __init__(self,master):
> 
>         self.container1 = 
> Frame(master,width=200,height=200,background='brown')
>         self.container1.pack()
>         self.str1 = StringVar()
>         self.str1 = "0"
>         self.entryWidget = Entry( 
> self.container1,textvariable=self.str1)       
>         self.entryWidget.pack(side=TOP)
> 
>         self.container2 = Frame(master,background='cyan')
>         self.container2.pack()
> 
>         self.container3 = Frame(master,background='grey')
>         self.container3.pack()
> 
>         self.operand = "0"
>         self.result = "0"
>         self.dotFlag = False
> 
>     def make_buttons(self):
>         self.buttonOne = Button(self.container2,text='1')
>         self.buttonOne.grid(row=0,column=0)
>         self.buttonTwo = Button(self.container2,text='2')
>         self.buttonTwo.grid (row=0,column=1)
>         self.buttonThree = Button(self.container2,text='3')
>         self.buttonThree.grid(row=0,column=2)
>         self.buttonFour = Button(self.container2,text='4')
>         self.buttonFour.grid (row=1,column=0)
>         self.buttonFive = Button(self.container2,text='5')
>         self.buttonFive.grid(row=1,column=1)
>         self.buttonSix = Button(self.container2,text='6')
>         self.buttonSix.grid(row=1,column=2)
>         self.buttonSeven = Button(self.container2,text='7')
>         self.buttonSeven.grid(row=2,column=0)
>         self.buttonEight = Button(self.container2,text='8')
>         self.buttonEight.grid(row=2,column=1)
>         self.buttonNine = Button(self.container2,text='9')
>         self.buttonNine.grid(row=2,column=2)
>         self.buttonZero = Button(self.container2,text='0')
>         self.buttonZero.grid(row=3,column=0)
>         self.buttonPoint = Button(self.container2,text='.')
>         self.buttonPoint.grid(row=3,column=1)
> 
>     def make_oprbuttons(self):
>               
>         self.buttonPlu = Button(self.container3,text='+',command = 
> lambda: self.oprClick('+',self.str1.get()))
>         self.buttonPlu.pack(side=LEFT)
> 
>         self.buttonMin = Button(self.container3,text='-',command = 
> lambda: self.oprClick('-',self.str1.get()))
>         self.buttonMin.pack(side=LEFT)
> 
>         self.buttonMul = Button(self.container3,text='*',command = 
> lambda: self.oprClick('*',self.str1.get()))
>         self.buttonMul.pack(side=LEFT)
> 
>         self.buttonDiv = Button(self.container3,text='/',command = 
> lambda: self.oprClick('/',self.str1.get()))
>         self.buttonDiv.pack(side=LEFT)
> 
>         self.buttonEqu = Button(self.container3,text='=',command = 
> lambda: self.oprClick('=',self.str1.get()))
>         self.buttonEqu.pack(side=LEFT)               
>            
>        
> 
> root = Tk()
> mycalc = Mycalc(root)
> mycalc.make_buttons()
> mycalc.make_oprbuttons()
> 
> root.mainloop()
> 
> 
> On 10/26/06, *Kent Johnson* <kent37 at tds.net <mailto:kent37 at tds.net>> wrote:
> 
>     Asrarahmed Kadri wrote:
>      >
>      >
>      > Hi folks,
>      >
>      > I am trying to build a rudimentary calculator application using
>     Tkinter...
>      >
>      > I have used one Entry widget for displaying the input and output
>     data.
>      > All this is put in a class.
>      > The porblem is when I click teh '+' button, teh callback function is
>      > called but it gives me an error message: AttributeError: 'str'
>     object
>      > has no attribute 'get'
>      >
>      > I have defined a variable, self.str1 = StringVar() to bind it
>     with the
>      > entry widget and I am calling the function when + is clciked. The
>      > function is as follows:
>      >
>      >    self.buttonPlu = Button(self.container3,text='+',command = lambda:
>      > self.oprClick('+',*self.str1.get()))*
>      >
>      > Can't we use the get() method to access the contents of the entry
>      > widget. Is there any other way to access the contents of the entry
>      > widget....???
> 
>     The error message is saying that the object you are calling get() on is
>     a string, not a StringVar. Please post complete code and the complete
>     error message including traceback.
> 
>     Kent
> 
>     _______________________________________________
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> 
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