jupyterのpythonで下記のプログラムで`self.value=eval(self.entry.get().replace)`と記号の置き換えをしているのですが演算子以外のものをどう書けばいいのかわかりません。どなたかおしえていただきたいです。

```

    import tkinter as tk
    
    class Application(tk.Frame):
    
        def __init__(self, master=None):
            super().__init__(master)
            self.master.geometry("400x300")
            self.master.title('計算機')
            
            self.entry = tk.Entry(self.master, justify="right")
    
            self.menu_bar = tk.Menu(self.master)
            self.master.config(menu=self.menu_bar)
    
            self.create_widgets()
    
        def input(self, action):
            self.entry.insert(tk.END, action)
    
        def clear_all(self):
            self.entry.delete(0, tk.END)
    
        def clear_one(self):
            txt = self.entry.get()
            self.entry.delete(0, tk.END)
            self.entry.insert(0, txt[:-1])
    
        def equals(self):
            self.value = eval(self.entry.get().replace('÷', '/').replace('x', '*').replace('%', '/100').replace('^','**').replace('√','**0.5').replace(''))
            self.entry.delete(0, tk.END)
            self.entry.insert(0, self.value)
    
        def create_widgets(self):
            file_menu = tk.Menu(self.menu_bar)
            file_menu.add_command(label='閉じる', command=self.master.quit)
            self.menu_bar.add_cascade(label='メニュー', menu=file_menu)
    
            self.entry.grid(row=0, column=0, columnspan=4, pady=3)
            self.entry.focus_set()
     
            tk.Button(self.master, text='7', width=4,
                      command=lambda: self.input(7)).grid(row=2, column=0)
            tk.Button(self.master, text='8', width=4,
                      command=lambda: self.input(8)).grid(row=2, column=1)
            tk.Button(self.master, text='9', width=4,
                      command=lambda: self.input(9)).grid(row=2, column=2)
    
            tk.Button(self.master, text='4', width=4,
                      command=lambda: self.input(4)).grid(row=3, column=0)
            tk.Button(self.master, text='5', width=4,
                      command=lambda: self.input(5)).grid(row=3, column=1)
            tk.Button(self.master, text='6', width=4,
                      command=lambda: self.input(6)).grid(row=3, column=2)
    
            tk.Button(self.master, text='1', width=4,
                      command=lambda: self.input(1)).grid(row=4, column=0)
            tk.Button(self.master, text='2', width=4,
                      command=lambda: self.input(2)).grid(row=4, column=1)
            tk.Button(self.master, text='3', width=4,
                      command=lambda: self.input(3)).grid(row=4, column=2)
    
            tk.Button(self.master, text='0', width=9,
                      command=lambda: self.input(0)).grid(row=5, column=0, columnspan=2)
            tk.Button(self.master, text='.', width=4,
                      command=lambda: self.input('.')).grid(row=5, column=2)
            tk.Button(self.master, text='=', width=4,
                      command=self.equals).grid(row=5, column=3)
    
            tk.Button(self.master, text='x', width=4,
                      command=lambda: self.input('x')).grid(row=2, column=3)
            tk.Button(self.master, text='-', width=4,
                      command=lambda: self.input('-')).grid(row=3, column=3)
            tk.Button(self.master, text='+', width=4,
                      command=lambda: self.input('+')).grid(row=4, column=3)
    
            tk.Button(self.master, text='AC', width=4,
                      command=lambda: self.clear_all()).grid(row=1, column=0)
            tk.Button(self.master, text='C', width=4,
                      command=lambda: self.clear_one()).grid(row=1, column=1)
            tk.Button(self.master, text='%', width=4,
                      command=lambda: self.input('%')).grid(row=1, column=2)
            tk.Button(self.master, text='÷', width=4,
                      command=lambda: self.input('÷')).grid(row=1, column=3)
            tk.Button(self.master, text='^',width=4,
                     command=lambda: self.input('^')).grid(row=1,column=4)
            tk.Button(self.master, text='√',width=4,
                     command=lambda: self.input('√')).grid(row=2,column=4)
                  
    root = tk.Tk()
    app = Application(master=root)
    app.mainloop()
    
```
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2020-08-28T02:31:48.943
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2020-08-29T08:09:23.330
2020-08-29T08:09:23.330
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question
python python3 tkinter
電卓プログラムの機能拡張(log、三角関数、pi、etc)をしたいのですがどうしたらよいでしょうか