I am learning/trying out tkinter, and trying to use a DoubleVar to store the data from a Scale widget and have it output through a Label.

This works fine, but it displays to a much higher significant figure level than I would like. Is this something I should control on the Label side or the DoubleVar side, and how would I do this?

    coefficient_of_resitution_value = tk.DoubleVar()
    coefficient_of_resitution_slider = ttk.Scale(coefficient_of_restitution_frame,
                                                 from_ = 0,
                                                 to = 1,
                                                 orient = "horizontal",
                                                 variable = coefficient_of_resitution_value,
                                                 style = "white_background_scale.Horizontal.TScale")
    coefficient_of_resitution_slider.grid(column = 0, row = 1, columnspan = 1, sticky = tk.NSEW)

    coefficient_of_resitution_display = ttk.Label(coefficient_of_restitution_frame,
                                                  textvariable = coefficient_of_resitution_value,
                                                  background = "#FFFFFF",
                                                  font = ("Calibri", 16))
    coefficient_of_resitution_display.grid(column = 1, row = 0, sticky = tk.NSEW)

CodePudding user response：

One of the way is to round the value to what you want inside the callback of command option:

    coefficient_of_resitution_slider['command'] = \
        lambda val: coefficient_of_resitution_value.set(round(float(val), 4))