Updating a button from 1 function in another using tkinter

Question

I am looking to update a button in my code by running a function later in the code that references a previous function, then update that said button with new text. When I run this code, it states that Source1 is not defined when the okay 3 function runs the if statement. New to coding and looking for tips. Thanks

from tkinter import *

import pandas as pd

##database = pd.ExcelFile('C:/Code/CODETEST.xlsx').parse(1)

excel_data_df = pd.read_excel('CODETEST.xlsx', sheet_name='Sheet1')

print(excel_data_df)

print(excel_data_df.columns.ravel())

##print(excel_data_df['Service Name'].tolist())


My_Service_List = (excel_data_df['Service Name'].tolist())

print(My_Service_List)

##Source1_Text = tk.StringVar()

root = Tk()

##Creating Entries
Group = Entry(root, width=50)
Group.grid(row=0, column=5)
Source = Entry(root, width=50)
Source.grid(row=1, column=5)
Service = Entry(root, width=50)
Service.grid(row=2, column=5)

global Source1
global Standard_window

def Standard_flow():
    ##global Source1_Text
    Standard_window = Tk()
    ##Source1_Text = tk.StringVar()
    ##Source1_Text.set("Original Text")
    Source1 = Button(Standard_window, text=My_Service_List[1])
    Source1.grid(row=1, column=1)
    Source2 = Button(Standard_window, text='HDA')
    Source2.grid(row=1, column=2)
    Source3 = Button(Standard_window, text='Router')
    Source3.grid(row=1, column=3)


# Definining Buttons
def Okay():
    hello = "Searching " + Group.get()
    myLabel = Label(root, text=hello)
    myLabel.grid(row=0, column=6)


def Okay2():
    hello2 = "Searching " + Source.get()
    myLabel2 = Label(root, text=hello2)
    myLabel2.grid(row=1, column=6)


def Okay3():
    hello3 = "Searching " + Service.get()
    myLabel3 = Label(root, text=hello3)
    myLabel3.grid(row=2, column=6)
    if My_Service_List.__contains__(Service.get()):
        Source1.config(text=My_Service_List[3])
        return Standard_flow()
    else:
        None


##Creating Buttons
myButton_Group = Button(root, text='Group Multicast IP', command=Okay)
myButton_Source = Button(root, text='Source IP', command=Okay2)
myButton_Service = Button(root, text='Service Name', command=Okay3)

##Displaying Buttons
myButton_Group.grid(row=0, column=1)
myButton_Source.grid(row=1, column=1)
myButton_Service.grid(row=2, column=1)

root.mainloop()

please keep a mention of which button you want to edit and and the error you get — Delrius Euphoria
– Delrius Euphoria, Commented Aug 5, 2020 at 20:51
The button I want to edit is "Source1", you see in the if statement "Source1.config(update text)" Error is.. "Exception in Tkinter callback Traceback (most recent call last): File "C:\Users\206415779\Anaconda3\envs\FINDIT\lib\tkinter_init_.py", line 1883, in call return self.func(*args) File "C:/Users/206415779/Python/FINDIT/FINDIT START", line 66, in Okay3 Source1.config(text=My_Service_List[3]) NameError: name 'Source1' is not defined" — Josh
– Josh, Commented Aug 5, 2020 at 21:00
try saying global Source1 inside of Standard_flow() and not on the main block — Delrius Euphoria
– Delrius Euphoria, Commented Aug 5, 2020 at 21:01
def Okay3(): hello3 = "Searching " + Service.get() myLabel3 = Label(root, text=hello3) myLabel3.grid(row=2, column=6) if My_Service_List.__contains__(Service.get()): Source1.config(text=My_Service_List[3]) return Standard_flow() Are you saying return Standard_flow(global Source1")? Also I'm not sure I understand, the "not on the main block"? — Josh
– Josh, Commented Aug 5, 2020 at 21:06

Delrius Euphoria · Accepted Answer · 2020-08-05 22:07:32Z

1

The problem is that your Source1 is a local variable and hence it is available only to the function that you defined it on, that is, Standard_flow(). To make this global and fix the error, just try saying this:

def Standard_flow():
    global Source1
    Standard_window = Tk()
    ......

With this change, the error should go and it should work. And just keep this global Source1 and remove all other global Source1 in your code(i mean the one outside the function)

Do let me know, if the error persists

Cheers

edited Aug 5, 2020 at 22:07

answered Aug 5, 2020 at 21:10

Delrius Euphoria

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10 Comments

Josh Over a year ago

Still no luck, I removed the global Source1 from above the Standard_flow function. I then added global Source1 to the Standard_flow. Still receive the same error when the if statement returns true. "NameError: name 'Source1' is not defined"

Delrius Euphoria Over a year ago

ive updated the Q with the whole code, take a look and let me know if its same to yours

Josh Over a year ago

I got it to work by defining Source1 prior to that function, but the problem is when the if statement is true and returns the Standard_flow function it shows the wrong text, when I click that button again I get the corrected updated text. do I have to return the new Source1 value prior to return Standard_flow?

Josh Over a year ago

Once again didn't come back to give thanks. @CoolCloud, thank you for the help!

Delrius Euphoria Over a year ago

@Josh oh, means alot, Happy coding

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