self.pack(fill=BOTH, expand=1) self.ratio1 = Entry(self, width=30).pack(side=TOP, padx=10, pady=10) self.doenSom = Button(self, text="Doen Som", command=self.data_prossesering) self.doenSom.place(x=155, y=40) self.uiset = Entry(self, width=20).pack(side=TOP, padx=50, pady=50) def data_prossesering(self): e = self.ratio1.get() e.split() r1 = float(e[0]) * float(e[1]) r2 = float(e[2]) * float(e[3]) a = r1/r2 return TkmessageBox.showInfo(math.sqrt(a) root = Tk() root.geometry("400x300") app = frame(root) root.mainloop()the objective of this program is to solve the following mathematical problem: the square root of the answer of 4 cross-multiplied numbers which are separated in pairs and divided by each other. the numbers are entered by the user in a text field, then when the button is clicked the square root appears in another text field below it. however, when i click the button, the following error appears:

Error:
  Exception in Tkinter callback
Traceback (most recent call last):
  File "/usr/lib/python3.5/tkinter/__init__.py", line 1553, in __call__
    return self.func(*args)
  File "/complete/path/to/file.py", line 42, in data_prossesering
    e = self.ratio1.get()
AttributeError: 'NoneType' object has no attribute 'get'

Does anyone know how to fix this? The grid, pack, and place methods of every Tkinter widget operate in-place and always return None. This means that you cannot call them on the same line as you create a widget. Instead, they should be called on the line below:

self.ratio1 = Entry(self, width=30)
self.ratio1.pack(side=TOP, padx=10, pady=10)

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