breezypythongui AddRadioButtongGroup抛出意外的AttributeError:“str”对象没有属性“\u root”

我正在尝试使用breezypythongui制作一个简单的Python GUI,但在添加单选按钮时遇到了麻烦。我试图使用“AddRadioButtongGroup”方法/方法,但每当我调用此方法时,GUI都会出错并声明:

 __init__
    self._commonVar = Tkinter.StringVar("")
  File "/Library/Frameworks/Python.framework/Versions/3.10/lib/python3.10/tkinter/__init__.py", line 540, in __init__
    Variable.__init__(self, master, value, name)
  File "/Library/Frameworks/Python.framework/Versions/3.10/lib/python3.10/tkinter/__init__.py", line 372, in __init__
    self._root = master._root()
AttributeError: 'str' object has no attribute '_root'

在互联网上进行的全面搜索没有发现任何信息,所以我希望这里的人可能知道为什么我不能在不出现此错误的情况下将单选按钮添加到GUI中。我的代码是:

from breezypythongui import EasyFrame
from tkinter import HORIZONTAL

class RadioButtonDemo(EasyFrame):
    """When the Display button is pressed, shows the label
    of the selected radio button.  The button group has a
    horizontal alignment."""

    def __init__(self):
        """Sets up the window and widgets."""
        EasyFrame.__init__(self, "Radio Button Demo")

        # Add the button group
        self.group = self.addRadiobuttonGroup(row=1, column=0,
                                              columnspan=4,
                                              orient=HORIZONTAL)

        # Add the radio buttons to the group
        self.group.addRadiobutton("Freshman")
        self.group.addRadiobutton("Sophomore")
        self.group.addRadiobutton("Junior")
        defaultRB = self.group.addRadiobutton("Senior")

        # Select one of the buttons in the group
        self.group.setSelectedButton(defaultRB)

        # Output field and command button for the results
        self.output = self.addTextField("", row=0, column=1)
        self.addButton("Display", row=0, column=0,
                       command=self.display)

    # Event handling method

    def display(self):
        """Displays the selected button's label in the text field."""
        self.output.setText(self.group.getSelectedButton()["value"])


def main():
    RadioButtonDemo().mainloop()


if __name__ == "__main__":
    main()