"tkinter.colorchooser" --- 顏色選擇對話框
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**原始碼：**Lib/tkinter/colorchooser.py

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"tkinter.colorchooser" 模組提供類別 "Chooser" 當作與原生顏色選擇器對話
框的介面。"Chooser" 實作了一個顏色選擇的互動視窗。類別 "Chooser" 繼承
了類別 "Dialog"。

class tkinter.colorchooser.Chooser(master=None, **options)

   The class implementing the modal color-choosing dialog. Most
   applications use the "askcolor()" convenience function rather than
   instantiating this class directly.

tkinter.colorchooser.askcolor(color=None, **options)

   Show a modal color-choosing dialog and return the chosen color.
   *color* is the color selected when the dialog opens. The return
   value is a tuple "((r, g, b), hexstr)", where "r", "g" and "b" are
   the red, green and blue components as integers in the range 0–255
   and *hexstr* is the equivalent Tk color string, such as
   "'#ff8000'". If the user cancels the dialog, "(None, None)" is
   returned.

   在 3.10 版的變更: The RGB values in the returned color are now
   integers in the range 0–255 instead of floats.

也參考:

  "tkinter.commondialog" 模組
     Tkinter 標準對話框模組
