Simple Hindi calculator

Cid calculator.py

from tkinter import*

def iCalc(source,side):
    storeObj=Frame(source, borderwidth=4, bd=4,bg="#00F5FF")
    storeObj.pack(side=side,expand=YES,fill=BOTH)
    return storeObj

def button(source,side,text,command=None):
    storeObj = Button(source, text=text, command=command)
    storeObj.pack(side=side, expand=YES, fill=BOTH)
    return storeObj

class app(Frame):
    def __init__(self):
        Frame.__init__(self)
        self.option_add('*Font','arial 20 bold')
        self.pack(expand=YES, fill=BOTH)
        self.master.title('CID Calculator   Created by: Manav')

        display = StringVar()
        Entry(self, relief=RIDGE,
              textvariable=display,justify='right',bd=30,bg="#FFBBFF").pack(side=TOP,expand=YES,
                      fill=BOTH)

        for clearBut in(["Sab Clear karna hai !"],["Clear All"]):
            erase = iCalc(self, TOP)
            for ichar in clearBut:
                button(erase, LEFT, ichar,
                       lambda storeObj=display, q=ichar: storeObj.set(''))

        for NumBut in ("789/", "456*", "123-","0.+"):
            FunctionNum = iCalc(self,TOP)
            for iEquals in NumBut:
                button(FunctionNum, LEFT, iEquals,
                       lambda storeObj=display, q=iEquals: storeObj.set(storeObj.get()+q))

        EqualsButton = iCalc(self, TOP)
        for iEquals in "=":
            if iEquals == '=':
                btniEquals = button(EqualsButton, LEFT, iEquals)
                btniEquals.bind('<ButtonRelease-1>',
                         lambda e, s=self ,storeObj=display: s.calc(storeObj),'+')
            else:
                btniEquals=button(EqualsButton,LEFT, iEquals,
                         lambda storeObj=display, s=' %s '%iEquals: storeObj.set(storeObj.get()+s))


    def calc(self,display):
        try:
            display.set(eval(display.get()))
        except:
            display.set("Ye Tarika Sahi nhi hai")

if __name__=='__main__':
    app().mainloop()