python的簡單GUI（數據綁定與listbox）

import tkinter
import tkinter.messagebox
import tkinter.ttk

classes={'1':['z1','z2','z3','z4'],
         '2':['l1','l2','l3'],
         '3':['m5','m6','m7','m8']}

root=tkinter.Tk()
root.title("GUI TWO")
root['height']=300
root['width']=270

def changeClass(event):
    grade=comboGrade.get()
    if grade:
        comboClass['values']=classes.get(grade)
    else:
        comboClass['values']=[]
        
def add():
    name=entryName.get()
    grade=comboGrade.get()
    cla=comboClass.get()
    if not (name.strip() and grade and cla):
        tkinter.messagebox.showerror('Add denied','information is not completed!')
    mess=name+";"+grade+";"+cla+";"+('Man' if sex.get() else 'Woman')+";"+('Y' if varLeader.get() else 'N')
    listboxData.insert(0,mess)
    print(mess.split(";"))

def deleteItem():
    currentItem=listboxData.curselection()     
    if currentItem:
        listboxData.delete(currentItem)
    else:
        tkinter.messagebox.showinfo(title="Delete denied", message="selected item is null!")
        
#label:name
labelName=tkinter.Label(root,
                        text='Name:',
                        justify=tkinter.RIGHT,
                        width=50)
labelName.place(x=10,y=5,width=50,height=20)

#input:name
varName=tkinter.StringVar(root,value='')
entryName=tkinter.Entry(root,
                        width=80,
                        textvariable=varName)
entryName.place(x=70,y=5,width=150,height=20)

#label:grade
labelGrade=tkinter.Label(root,
                         text='Grade:',
                         justify=tkinter.RIGHT,
                         width=50)
labelGrade.place(x=10,y=40,width=50,height=20)

#combobox:grade
comboGrade=tkinter.ttk.Combobox(root,
                                width=50,
                                values=tuple(classes.keys()))
comboGrade.place(x=70,y=40,width=50,height=20)

#label:class
labelClass=tkinter.Label(root,
                         text='Class:',
                         justify=tkinter.RIGHT,
                         width=50)
labelClass.place(x=150,y=40,width=50,height=20)

#combobox:class
comboClass=tkinter.ttk.Combobox(root,width=50)
comboClass.place(x=200,y=40,width=50,height=20)

#label:sex
labelSex=tkinter.Label(root,
                       text='Sex:',
                       justify=tkinter.RIGHT,
                       width=50)
labelSex.place(x=5,y=70,width=50,height=20)

#default sex
sex=tkinter.IntVar(root,value=1)

#radioButton:man
radioMan=tkinter.Radiobutton(root,
                             text='Man',
                             value=1,
                             variable=sex)
radioMan.place(x=70,y=70,width=50,height=20)

#radioButton:woman
radioWoman=tkinter.Radiobutton(root,
                               text='Woman',
                               value=0,
                               variable=sex)
radioWoman.place(x=140,y=70,width=90,height=20)

#check:leader
varLeader=tkinter.IntVar(root,value=0)
checkLeader=tkinter.Checkbutton(root,
                                text='is leader?',
                                variable=varLeader,
                                onvalue=1,
                                offvalue=0)
checkLeader.place(x=10,y=100,width=90,height=20)

#button:add
buttonAdd=tkinter.Button(root,
                         text='Add',
                         width=40,
                         command=add)
buttonAdd.place(x=150,y=100,width=40,height=20)

#button:delete
buttonDelete=tkinter.Button(root,
                            text='Delete',
                            width=80,
                            command=deleteItem)
buttonDelete.place(x=200,y=100,width=50,height=20)

#listbox
listboxData=tkinter.Listbox(root,width=300)
listboxData.place(x=15,y=130,width=235,height=150)

comboGrade.bind('<<ComboboxSelected>>',changeClass)
root.mainloop()