import math
from tkinter import *
#fenster aufbau
root = Tk()
root.title("Calculator")

#def controlls
def awnser():
    if "opz" in globals():
        global e
        e = 1
        return
    else:
        global d
        d = 1
        return
def awnser2():
    if "opz" in globals():
        global e
        e = 2
        return
    else:
        global d
        d = 2
        return
def awnser3():
    if "opz" in globals():
        global e
        e = 3
        return
    else:
        global d
        d = 3
        return
def awnser4():
    if "opz" in globals():
        global e
        e = 4
        return
    else:
        global d
        d = 4
        return
def awnser5():
    if "opz" in globals():
        global e
        e = 5
        return
    else:
        global d
        d = 5
        return
def awnser6():
    if "opz" in globals():
        global e
        e = 6
        return
    else:
        global d
        d = 6
        return
def awnser7():
    if "opz" in globals():
        global e
        e = 7
        return
    else:
        global d
        d = 7
        return
def awnser8():
    if "opz" in globals():
        global e
        e = 8
        return
    else:
        global d
        d = 8
        return
def awnser9():
    if "opz" in globals():
        global e
        e = 9
        return
    else:
        global d
        d = 9
        return
def awnser0():
    if "opz" in globals():
        global e
        e = 0
        return
    else:
        global d
        d = 0
        return
def opzP():
    global opz
    opz = "+"
    return
def opzM():
    global opz
    opz = "-"
    return
def opzMA():
    global opz
    opz = "*"
    return
def opzG():
    global opz
    opz = "/"
    return
def btest1():
    global e
    e = 1
    return
def calcend():
    if (opz == "+", opz == "-", opz == "*", opz == "/"):
        if (opz == "+"):
            c = d + e
            c = str(c)
            erg.set(c)
        if (opz == "-"):
            c = d - e
            c = str(c)
            erg.set(c)
        if (opz == "/"):
            if (e == 0):
                erg.set("MathError")
            else:
                c = d / e
                c = str(c)
                erg.set(c)
        if (opz == "*"):
            c = d * e
            c = str(c)
            erg.set(c)
    else:
        print("Operationszeichen nicht erkannt.")

erg = StringVar()
erg.set("Answer")

awn = Label(root, textvariable=erg,font="Impact")

#Was tut der Button

b1 = Button(root, text="1", command =awnser)
b2 = Button(root, text="2", command =awnser2)
b3 = Button(root, text="3", command =awnser3)
b4 = Button(root, text="4", command =awnser4)
b5 = Button(root, text="5", command =awnser5)
b6 = Button(root, text="6", command =awnser6)
b7 = Button(root, text="7", command =awnser7)
b8 = Button(root, text="8", command =awnser8)
b9 = Button(root, text="9", command =awnser9)
b0 = Button(root, text="0", command =awnser0)
bP = Button(root, text="+", command =opzP)
bM = Button(root, text="-", command =opzM)
bMA = Button(root, text="*", command =opzMA)
bG = Button(root, text="/", command =opzG)
calcend = Button(root, text="calculate", command =calcend)

# Zeige die Sachen im Fenster
awn.pack()
b1.pack(side=LEFT)
b2.pack(side=LEFT)
b3.pack(side=LEFT)
b4.pack(side=LEFT)
b5.pack(side=LEFT)
b0.pack(side=RIGHT)
b9.pack(side=RIGHT)
b8.pack(side=RIGHT)
b7.pack(side=RIGHT)
b6.pack(side=RIGHT)
calcend.pack(side=BOTTOM)
bP.pack(side=BOTTOM)
bM.pack(side=BOTTOM)
bMA.pack(side=BOTTOM)
bG.pack(side=BOTTOM)

root.mainloop()