tkinter-combobox

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self.name = tk.StringVar()
self.nameEntered = ttk.Entry(topFrame, width=15, textvariable=self.name)

self.measureTypeStr = tk.StringVar()
measureType = ttk.Combobox(topFrame, width=15, textvariable=self.measureTypeStr, state='readonly', command=self.on_cmb_select)
# Adding combobox drop down list
measureType['values'] = ('圆弧',
                            '距离',
                            '角度')
measureType.current(1)
measureType.pack(side=tk.LEFT, padx=4)
cmbMeasureType.bind("<<ComboboxSelected>>", self.on_cmb_select)

def on_cmb_select(self,event):
    if not self.name.get():
        self.nameEntered.delete(0,tk.END)
        self.nameEntered.insert(0, self.measureTypeStr.get())
    pass