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from tkinter import *
import tkinter as tk
import math


def click(key):
    global memory
    if key == '=':
        
        str1 = "-+0123456789."
        try:
            result = eval(entry.get())
            entry.insert(tk.END, " = " + str(result))
        except:
            entry.insert(tk.END, "Syntax ERROR")
    
    elif key == 'C':
        entry.delete(0, tk.END)

    elif key == '<~':

    elif key == '->M':
        memory = entry.get()



        if '=' in memory:
            ix = memory.find('=')
            memory = memory[ix+2:]

    elif key == 'M->':
        entry.insert(tk.END, memory)

        
   
        if '=' in entry.get():
            entry.delete(0, tk.END)
        try:
            if entry.get()[0] == '-':
                entry.delete(0)
            else:
                entry.insert(0, '-')
        except IndexError:
            pass
    else:
       
        if '=' in entry.get():
            entry.delete(0, tk.END)
        entry.insert(tk.END, key)


            
root = tk.Tk()
root.geometry('300x300')
root.title("Taschenrechner")
button_list = [
    '7','8','9','*','C',
    '4','5','6','/','<~',
    '1','2','3','-','M-',
    '0','.','=','+','%']
r=1
c=0

for i in button_list:
    rel='ridge'
    cmd=lambda x=i: click(x)
    tk.Button(root, text=i, width=5,height=2,font='bold',relief=rel, command=cmd).grid(row=r, column=c)
    c +=1
    if c>4:
        c=0
        r +=1

entry = tk.Entry(root, width=29 ,bg="white",font='bold',bd=10)
entry.grid(row=0, column=0, columnspan=10)
root.mainloop()

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entry.delete(tk.END)

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def click(key):
    global memory
    if key == '=':
        
        str1 = "-+0123456789."
        try:
            result = eval(entry.get())
            entry.insert(tk.END, " = " + str(result))
        except:
            entry.insert(tk.END, "Syntax ERROR")

            
    elif key == 'C':
        entry.delete(0,tk.END)

    elif key == '←':
        entry.delete(tk.END)

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entry.delete(len(entry.get())-1)

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try:
    import Tkinter as tk
except ImportError:
    import tkinter as tk
from functools import partial


class Calculator(object):
    def __init__(self, parent):
        self.memory = ''

        button_texts = [
            ['7', '8', '9', '*', 'C'],
            ['4', '5', '6', '/', '<~'],
            # 
            # FIXME: 'M-' is not connected to any action.
            # 
            ['1', '2', '3', '-', 'M-'],
            ['0', '.', '=', '+', '%'],
        ]
        for row_number, text_row in enumerate(button_texts, 1):
            for column_number, text in enumerate(text_row):
                tk.Button(
                    parent,
                    text=text,
                    width=5,
                    height=2,
                    font='bold',
                    relief=tk.RIDGE,
                    command=partial(self.click, text)
                ).grid(row=row_number, column=column_number)

        self.entry = tk.Entry(
            parent, width=29, bg='white', font='bold', bd=10
        )
        self.entry.grid(row=0, column=0, columnspan=10)

    def click(self, key):
        # 
        # TODO: Break this method up into one method per calculator key (type).
        # 
        if key == '=':
            try:
                result = ' = {0}'.format(eval(self.entry.get()))
            except Exception as error:
                result = ' [{0}]'.format(error)
            self.entry.insert(tk.END, result)
       
        elif key == 'C':
            self.entry.delete(0, tk.END)
     
        elif key == '<~':
            pass

        elif key == '->M':
            pre, equal, post = self.entry.get().partition('=')
            self.memory = (post if equal else pre).strip()
     
        elif key == 'M->':
            self.entry.insert(tk.END, self.memory)
            if '=' in self.entry.get():
                self.entry.delete(0, tk.END)
            try:
                if self.entry.get()[0] == '-':
                    self.entry.delete(0)
                else:
                    self.entry.insert(0, '-')
            except IndexError:
                pass

        else:
            if '=' in self.entry.get():
                self.entry.delete(0, tk.END)
            self.entry.insert(tk.END, key)
 
 
def main():
    root = tk.Tk()
    root.title('Taschenrechner')
    _calculator = Calculator(root)
    root.mainloop()


if __name__ == '__main__':
    main()

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    elif key == '√':
        a=int(entry.get())**(1/2)
        entry.insert(tk.END," = " + str(round(a,3)))

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if a % 1 == 0:
    round(a, 0) # <- wirkt sich natürlich auf nichts aus
else:
    round(a, 4) # s.o.

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def do_something(text):
    if text == "":
        return
    else:
        pass

entry.bind("<Return>", command=lambda: do_something(entry.get())