Exception into output box from tkinter python 3

Question

I'm somewhat new to python but have just recently started working with tkinter and exceptions. I have a script that returns the index entry to an output box based on user entering 0-2 in the text box. If I enter an invalid value like 'a' there will be an exception and i want that exception to be displayed in the output box. I tried using my usual try /except approach with no luck, any tips?

from tkinter import *


window=Tk()

choice=['Apple','book','cat']


l1=Label(window,text="Enter index 0-2")
l1.grid(row=0,column=0)


option=IntVar()
e1=Entry(window,textvariable=option)
e1.grid(row=0,column=1)

try:

    def click():
       i=option.get()
       output.delete(0.0, END)
       output.insert(END, choice[i])


    output=Text(window,heigh=6,width=85,wrap=WORD)
    output.grid(row=4,column=3,rowspan=6,columnspan=2)
    #define buttons
    b1=Button(window,text="run",width=12,command=click) #command=click
    b1.grid(row=3,column=3)

except Exception as e:
    output.insert(END,("Error occured with execution: {0}".format(e))

FWIW, the index of a text widget is a string rather than a floating point number, and the index of the first character is "1.0". — Bryan Oakley
– Bryan Oakley, Commented Jan 5, 2020 at 5:07

ncica · Accepted Answer · 2020-01-04 18:50:49Z

2

A operation which can raise exception(or we expect that will raise exception) are placed inside the try clause and the code that handles exception is written in except clause.

your code should look like:

def click():
   choice = ['Apple', 'book', 'cat']
   try:
       i=option.get()
       output.delete(0.0, END)
       output.insert(END, choice[i])
   except Exception as e:
       output.insert(END,("Error occured with execution: {0}".format(e)))

window=Tk()

l1=Label(window,text="Enter index 0-2")
l1.grid(row=0,column=0)


option=IntVar()
e1=Entry(window,textvariable=option)
e1.grid(row=0,column=1)

output=Text(window,heigh=6,width=85,wrap=WORD)
output.grid(row=4,column=3,rowspan=6,columnspan=2)
#define buttons
b1=Button(window,text="run",width=12,command=click) #command=click
b1.grid(row=3,column=3)

window.mainloop()

answered Jan 4, 2020 at 18:50

ncica

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