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I need help with making my claculator

woooee at gmail.com wrote:

> First, you have to have a Tk instance before you do anything else.  Take a
> look at this example, and then expand upon it to create the calculator 
> http://python-textbok.readthedocs.io/en/1.0/Introduction_to_GUI_Programming.html

While I agree that creating a Tk instance explicitly is preferable tkinter 
will create one if you don't:

>>> import tkinter
>>> tkinter._default_root is None
>>> frame = tkinter.Frame()
>>> tkinter._default_root
<tkinter.Tk object at 0x7f751b0c65f8>
>>> frame.master is tkinter._default_root