如何修复此 python 计算器错误？

Question

提前感谢您的帮助。我需要计算器方面的帮助。谢谢ssssss 这是错误： Tkinter 回调中的异常 回溯（最近一次通话最后）： call 中的文件“C:\Users\Owner\AppData\Local\Programs\Python\Python38-32\lib\tkinter_init_.py”，第 1883 行 返回 self.func(*args) 文件“C:/Users/Owner/Documents/Benjamin Stuff/BENS CALCULATOR.py”，第 42 行，在 lambda e, s=self, storeObj=display: s.calc(storeObj), '+') AttributeError: 'app' 对象没有属性 'calc'

代码：

from tkinter import*

def iCalc (source, side):
    storeObj = Frame(source, borderwidth = 1, bd= 4, bg="sky blue")
    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', 'Comic 20 bold')
            self.pack(expand=YES, fill=BOTH)
            self.master.title('Bens Calculator')
        
            display = StringVar()
            Entry(self, relief=FLAT,
                  textvariable=display,justify='right',bd=30,bg='sky blue').pack(side=TOP, expand=YES,
                          fill=BOTH)
        
            for clearBut in (["CE"], ["C"]):
                erase = iCalc(self,TOP)
                for ichar in clearBut:
                    button(erase, LEFT, ichar,
                           lambda storeObj=display, q=ichar: storeObj.set(''))
        
            for NumBut in ("789%", "456x", "123+", "0.+"):
                FunctionNum = iCalc(self, TOP)
                for char in NumBut:
                    button(FunctionNum, LEFT, char,
                       lambda storeObj=display, q=char: 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))


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

def calc(self, display):
     try:
        display.set(eval(display.get()))
     except:
        display.set("ERROR")

如果有帮助，我正在制作一个计算器。当我按下等于按钮时会发生这种情况。任何帮助都会很棒。谢谢你。祝你有美好的一天......

Answer 1

错误表明类“app”的对象没有方法或属性“calc”。您需要在 app 类中创建一个名为“calc”的方法。

from tkinter import*

def iCalc (source, side):
    storeObj = Frame(source, borderwidth = 1, bd= 4, bg="sky blue")
    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', 'Comic 20 bold')
        self.pack(expand=YES, fill=BOTH)
        self.master.title('Bens Calculator')
    
        display = StringVar()
        Entry(self, relief=FLAT,
              textvariable=display,justify='right',bd=30,bg='sky blue').pack(side=TOP, expand=YES,
                      fill=BOTH)
    
        for clearBut in (["CE"], ["C"]):
            erase = iCalc(self,TOP)
            for ichar in clearBut:
                button(erase, LEFT, ichar,
                       lambda storeObj=display, q=ichar: storeObj.set(''))
    
        for NumBut in ("789%", "456x", "123+", "0.+"):
            FunctionNum = iCalc(self, TOP)
            for char in NumBut:
                button(FunctionNum, LEFT, char,
                   lambda storeObj=display, q=char: 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("ERROR")

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