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    <p>I found this calculator code in the web. </p> <p>I want to add some function, like the pow() but it returns an error.</p> <p>The error:</p> <blockquote> <p>button(powF, LEFT, 'pow', lambda w=display: w.set(w.pow()))</p> <p>AttributeError: StringVar instance has no attribute 'pow'</p> </blockquote> <hr> <pre><code>from Tkinter import * import math def frame(root, side): w = Frame(root) w.pack(side=side, expand=YES, fill=BOTH) return w def button(root, side, text, command=None): w = Button(root, text=text, command=command) w.pack(side=side, expand=YES, fill=BOTH) return w class Calculator(Frame): def __init__(self): Frame.__init__(self) self.option_add('*Font', 'Verdana 20 bold') self.pack(expand=YES, fill=BOTH) self.master.title('tk') self.master.iconname("calcu1ator") display = StringVar() Entry(self,relief=SUNKEN,textvariable=display).pack(side=TOP,expand=YES,fill=BOTH) for key in ("123", "456", "789", "-0."): keyF = frame(self, TOP) for char in key: button(keyF, LEFT, char,lambda w=display, c=char: w.set(w.get() + c)) opsF = frame(self, TOP) for char in "+-*/=": if char == '=': btn = button(opsF, LEFT, char) btn.bind('&lt;ButtonRelease-1&gt;',lambda e, s=self, w=display: s.calc(w), '+') else: btn = button(opsF, LEFT, char,lambda w=display, s=' %s '%char:w.set(w.get()+s)) clearF = frame(self, BOTTOM) button(clearF, LEFT, 'Clr', lambda w=display: w.set('')) #powF = frame(self, BOTTOM) #button(powF, LEFT, 'pow', lambda w=display: pow(w,2)) def calc(self, display): try: display.set(eval(display.get())) except: display.set("ERROR") if __name__ == '__main__': Calculator().mainloop() </code></pre>
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    1. COWhat's the error? Help us help you. Don't make people read your code to figure out what you're doing wrong.
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    2. COwherever you got this code from, its bad, using `eval` is not good. ever.
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    3. CO@InbarRose -- `eval` exists for a reason. Guido has never backed down from removing/changing the language to remove unnecessary stuff -- Thus, Guido at least still believes that `eval` has a place in the language (I do to). However, you're definitely right that it shouldn't be used flippantly -- especially if you ever plan on sharing the code with others.
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