TypeError: 'NoneType' object is not callable - Python Tkinter

Question

Hi guys i'm making a Temperature Converter based on Tkinter in Python and it was all good but now i'm getting this error. I looked here on stackoverflow for this error, i found a lot of them but i couldn't figured out, so i'm here to post my code to see if you guys can help. The program crashes exactly when i click a option on the OptionMenu. (om_input specifically)

Here is the error:

Traceback (most recent call last):
TypeError: 'NoneType' object is not callable

It throws another exception:

AttributeError: 'StringVar' object has no attribute '_report_exception'

Here are snippets of my code:

This function is supposed to be called everytime the user selects an option in the OptionMenu in the GUI.

def check_entry():

if temperature_input.get() == "Celsius":
    celsius_converter(value_entry.get(), temperature_output.get(), output_entry)

elif temperature_input.get() == "Kelvin":
    kelvin_converter(value_entry.get(), temperature_output.get(), output_entry)

else:
    fahrenheit_converter(value_entry.get(), temperature_output.get(), output_entry)

The vars to be used with the OptionMenus

root = Tk()
temperature_list = ["Celsius", "Kelvin", "Fahrenheit"]    

temperature_input = StringVar(root)
temperature_input.set(temperature_list[0])

temperature_output = StringVar(root)
temperature_output.set(temperature_list[0])

output_entry = Entry(root, state=NORMAL)

Initialization of the OptionMenus

om_input = OptionMenu(root, temperature_input, *temperature_list, command=check_entry)
om_output = OptionMenu(root, temperature_output, *temperature_list, command=check_entry)
root.mainloop()

please provide a complete working program with the smallest amount of code that reproduces the problem (see stackoverflow.com/help/mcve) — Bryan Oakley
– Bryan Oakley, Commented Nov 30, 2015 at 21:14
Is that your entire traceback? I'd expect to see lines like File "myfile.py", line 9 and such before the actual error message. Did you cut anything out? — Kevin
– Kevin, Commented Nov 30, 2015 at 21:18
Well, while i was working on a minimal program, the program seemed to work, now i'm looking for whats different but i don't think anything is. I cut the parts i didn't think it was important for the problem. — Memphys
– Memphys, Commented Nov 30, 2015 at 21:55
I solved it. Just changed some things in a method. I'm new here, sorry for not posting correctly. Thanks for your time guys. — Memphys
– Memphys, Commented Nov 30, 2015 at 22:14

Memphys · Accepted Answer · 2015-11-30 22:13:46Z

1

I solved it and the problem was in a method that i didn't post here, stupidly, and i apologize for that.

The method was like that:

def update_entry():
    temp_input.trace("w", check_entry())
    root.after(1, update_entry)

I went through Tkinter documentations and read about StringVar and the trace() method and i just changed "w" to "u", worked charmly. Thanks for your time.

answered Nov 30, 2015 at 22:13

Memphys

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