Color Entry
The tkinter.colorchooser module can be used to specify an RGB color value.
tkinter.colorchooser.askcolor([color [,options]]). The convenience function returns two values; the first is the color as a RGB triplet (a 3-tuple containing the red, green and blue values as integers in the range 0-255), the second a Tk color string. To preset a color when you display the dialog, you can pass a color (in either format) to the function.
If the dialog is cancelled, the function returns (None, None)
Figure 9-7. askcolor (in Swedish)

The following options can be used with the askcolor function:
Table 9-5. askcolor Options
| 
 Option  | 
 Type  | 
 Description  | 
|---|---|---|
| 
 initialcolor  | 
 color  | 
 Color to mark as selected when dialog is displayed (given as an RGB triplet or a Tk color string). (the first argument to the convenience function).  | 
| 
 parent  | 
 widget  | 
 Which window to place the message box on top of. When the dialog is closed, the focus is returned to the parent window.  | 
| 
 title  | 
 string  | 
 Message box title.  |