How to import values from a window to another window

Python Help
1

I have put a solution (PySimpleGUI: Working with Multiple Windows - Mouse Vs Python) into a program to make a save function, but everytime I tried to use an input for a value into said program, it returns a “Key Error” error. I print the values, but found no value relating to the input. Here’s the example code; run the program and click on the “print” key if you don’t believe me.

import PySimpleGUI as sg

def main():
    layout = [  [sg.Button(button_text = 'Save', key = 'SV'), sg.Button(button_text = 'Print', key = 'PR')],
                [sg.Input(default_text = "0", key = "V1")]  ]
    window = sg.Window("Main", layout)
    while True:
        event, values = window.read()
        if event == "Exit" or event == sg.WIN_CLOSED:
            break

        value1 = values['V1']

        if event == 'PR':
            print(event, values)

        if event == 'SV':
            if sg.Window("Other Window", [[sg.Input(default_text = "0", key = "V2")], 
                                          [sg.Button(button_text = 'Save', key = 'IN')]]).read(close=True)[0] == 'IN':
                print(values["V2"])
        
    window.close()
if __name__ == "__main__":
    main()
2

This reads the values from the first window. But values["V2"] is from the second window. You should assign the second window to another variable and read the values from that again before you can print them.

3

Thanks, but how do you assign a variable to the second window and import it to the main window in a method like this?

4

This line does many things at once. Let’s change it one step at a time. First extract the window into a variable:

window2  = sg.Window("Other Window", [[sg.Input(default_text = "0", key = "V2")], 
                                          [sg.Button(button_text = 'Save', key = 'IN')]])
if window2.read(close=True)[0] == 'IN':

Now put the read on a separate line:

window2  = sg.Window("Other Window", [[sg.Input(default_text = "0", key = "V2")], 
                                          [sg.Button(button_text = 'Save', key = 'IN')]])
read_result = window2.read(close=True)
if read_result[0] == 'IN':

This still doesn’t work because we didn’t really change anything.

But now the change to fix it is simple:

window2  = sg.Window("Other Window", [[sg.Input(default_text = "0", key = "V2")], 
                                          [sg.Button(button_text = 'Save', key = 'IN')]])
event, values = window2.read(close=True)
if event == 'IN':

Before only the event of the second window was used (without assigning it to a variable). Now both the event and the values are assigned to variables. So when you later use the values variable, they contain the data from this second window.

5

Thanks. It should look like this:

import PySimpleGUI as sg

def main():
    layout = [  [sg.Button(button_text = 'Save', key = 'SV'), sg.Button(button_text = 'Print', key = 'PR')],
                [sg.Input(default_text = "0", key = "V1")]  ]
    window = sg.Window("Main", layout)
    while True:
        event, values = window.read()
        if event == "Exit" or event == sg.WIN_CLOSED:
            break

        value1 = values['V1']

        if event == 'PR':
            print(event, values)

        if event == 'SV':
            window2  = sg.Window("Other Window", [[sg.Input(default_text = "0", key = "V2")], 
                                          [sg.Button(button_text = 'Save', key = 'IN')]])
            event, values = window2.read(close=True)
            if event == 'IN':
                print(values["V2"])
        
    window.close()
if __name__ == "__main__":
    main()