CODEWITHSUNDEEP
pythontkinterjupyter-notebook
Terry Bogard
Terry Bogard

Reputation: 57

How to assign a tkinter Scale value to a variable in Jupyter Notebook?

Here is the first cell of Jupyter Notebook which is a simple tkinter program.

Can I assign the scale value to the variable "a" and use it in the following cells of Jupyter Notebook?

Now the value of "a" I can get is always 0 in the following cells of Jupyter Notebook.

from tkinter import *
a = 0
def sel():
    selection = "Value = " + str(var.get())
    a = var.get()
    label.config(text = selection)

root = Tk()
var = DoubleVar()
scale = Scale( root, variable = var )
scale.pack(anchor=CENTER)

button = Button(root, text="Get Scale Value", command=sel)
button.pack(anchor=CENTER)

label = Label(root)
label.pack()
root.mainloop()

#print(a)

Upvotes: 0

Views: 272

Answers (1)

8349697
8349697

Reputation: 605

a = var.get(): Here a is a local variable within the function.


a = 0
def sel():
    a = 2
    print("a from sel:", a)
sel()
print("a:", a)

Output:


a from sel: 2
a: 0

Alternatively, you can make a a global variable.


from tkinter import *


global scale_value
# set default
scale_value = 0


def save_scale_value(event):
    global scale_value
    # save the current value while the program is running
    scale_value = event.widget.get()
    print(f"Saved: {scale_value}")

    
def sel():
    # reuse a variable in another function
    global scale_value
    print(f"global scale_value: {scale_value}")
    selection = "Value = " + str(var.get())
    label.config(text = selection)


root = Tk()
var = DoubleVar()

scale = Scale( root, variable = var )
scale.pack(anchor=CENTER)

button = Button(root, text="Get Scale Value", command=sel)
button.pack(anchor=CENTER)

label = Label(root)
label.pack()

scale.bind("<ButtonRelease>", save_scale_value)
root.mainloop()

# this will only print after the window is closed, when the root is destroyed
print(scale_value)

Also, you may not need an additional variable. You can use var after closing the window too.


from tkinter import *

    
def sel():
    selection = "Value = " + str(var.get())
    label.config(text = selection)


root = Tk()
var = DoubleVar()

scale = Scale(root, variable = var)
scale.pack(anchor=CENTER)

button = Button(root, text="Get Scale Value", command=sel)
button.pack(anchor=CENTER)

label = Label(root)
label.pack()

root.mainloop()

# this will only print after the window is closed, when the root is destroyed
print(var.get())
# Later, you can assign the scale value to a variable in a cell.
# name = var.get()

Upvotes: 1

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