python tkinter option menu help - object has no attribute '_root'

python tkinter attributeerror optionmenu

This is where the problems are.

self.fumeEntry = StringVar(self)self.fumeEntryOM = OptionMenu(self, self.fumeEntryOM, '1', '2', '3')

The master or parent of these widgets must be a Tkinter widget. self (referring to MyApp class) is just a class and not a Tkinter widget.

You have two options available to you.

Make MyApp a subclass of the Tk() widget
```
class MyApp(Tk):# extra code goes here
```

Make the StringVar and OptionMenu slaves of self.master.

self.fumeEntry = StringVar(self.master)# extra codeself.fumeEntryOM = OptionMenu(self.master, self.fumeEntry, "1", "2", "3")

python tkinter attributeerror optionmenu

Your option menu isn't being initialised with the variable. You have:

self.fumeEntryOM = OptionMenu(self, self.fumeEntryOM, '1', '2', '3')

Should be:

self.fumeEntryOM = OptionMenu(self, self.fumeEntry, '1', '2', '3')

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