Get variable from another file - python

Question

I am creating a Tkinter program that allows the user to enter text into a nice looking box rather than the python shell.

As I would like to use this in multiple programs I made into a function that can be used in other files.

I can get it to run in another file, but not import the variable here is my code.

File 1:

import tkinter as tk

def input_text(label_text, button_text):
    class SampleApp(tk.Tk):

        def __init__(self):
            tk.Tk.__init__(self)
            self.entry = tk.Entry(self)
            self.button = tk.Button(self, text=button_text, command=self.on_button)
            self.label = tk.Label(self, text=label_text)
            self.label.pack(side = 'top', pady = 5)
            self.button.pack(side = 'bottom', pady = 5)
            self.entry.pack()


        def on_button(self):
            answer = self.entry.get()
            self.destroy()


    w = SampleApp()
    w.resizable(width=True, height=True)
    w.geometry('{}x{}'.format(180, 90))
    w.mainloop()

File 2:

import text_input as ti
from text_input import answer
ti.input_text('Enter some text', 'OK')

I get the error ImportError: cannot import name 'answer'

You don't seem to be saving 'answer' anywhere, so it doesn't exist outside the function on_button. I think there's probably a better way to do this - not having the class and control code in the same function, for example. — Simon Fraser
– Simon Fraser, Commented Jul 28, 2017 at 18:44

Prune · Accepted Answer · 2017-07-28 18:57:56Z

1

answer is a local variable withinbutton. If you want toimport` it, you need to make it a package attribute:

import tkinter as tk

global answer

def input_text(label_text, button_text):
    class SampleApp(tk.Tk):
    ...

        def on_button(self):
            global answer
            answer = self.entry.get()

However, this is a very strange way to access the data. Clean module design would likely have the object (SampleApp) at hand, and extract the answer with a method call for that app. More simply, why not just return that value from on_button?

    def on_button(self):
        answer = self.entry.get()
        self.destroy()
        return answer

... so your usage would be

response = my_app.on_button()

answered Jul 28, 2017 at 18:57

Prune

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