Changing ttk widget text color

You will need to create a custom style, and then apply that style to the widget. To create a custom style, first get an instance of ttk.Style, and then use the configure method to derive a new style from an existing one. The following example creates a new style named "Red.TCheckbutton":

style = ttk.Style()style.configure("Red.TCheckbutton", foreground="red")

Next, you simply associate this style with the widget when you want the color to change:

my_checkbutton.configure(style="Red.TCheckbutton")

The best resource for learning how to work with the ttk styles is tkdocs.com. Specifically, https://www.tkdocs.com/tutorial/styles.html.

Here's a complete working example:

import ttkimport Tkinter as tkclass ExampleApp(tk.Frame):    def __init__(self, *args, **kwargs):        tk.Frame.__init__(self, *args, **kwargs)        self.var1 = tk.StringVar()        self.var2 = tk.StringVar()        f1 = ttk.Frame(self)        red_button = ttk.Button(f1, text="Red", command=self.make_red)        default_button = ttk.Button(f1, text="Default", command=self.make_default)        red_button.pack(side="left")        default_button.pack(side="left")        f2 = ttk.Frame(self)        self.cb_one = ttk.Checkbutton(f2, text="Option 1", variable=self.var1,                                      onvalue=1, offvalue=0)        self.cb_two  = ttk.Checkbutton(f2, text="Option 2", variable=self.var2,                                       onvalue=1, offvalue=0)        self.cb_one.pack(side="left")        self.cb_two.pack(side="left")        f1.pack(side="top", fill="x")        f2.pack(side="top", fill="x")        style = ttk.Style()        style.configure("Red.TCheckbutton", foreground="red")    def make_red(self):        self.cb_one.configure(style="Red.TCheckbutton")        self.cb_two.configure(style="Red.TCheckbutton")    def make_default(self):        self.cb_one.configure(style="TCheckbutton")        self.cb_two.configure(style="TCheckbutton")if __name__ == "__main__":    root = tk.Tk()    ExampleApp(root).pack(fill="both", expand=True)    root.mainloop()