Python编程基础与应用 第2版 课习题答案 李方园 第6章答案

6.1以例程为例，运行结果如图1所示图1GUI控件包括：窗口、菜单等。6.2参考程序（注意文件名称不能是jpg，且需要放置在当前目录下）importtkinterastkroot=tk.Tk()#增加背景图片photo=tk.PhotoImage(file="bg.png")theLabel=tk.Label(root,text="大家好，才是真的好.",#内容justify=tk.LEFT,#对齐方式image=photo,#加入图片compound=tk.CENTER,#关键:设置为背景图片font=("华文行楷",20),#字体和字号fg="white")#前景色theLabel.pack()tk.mainloop()6.3参考程序（这里是复选框）importtkinterastktop=tk.Tk()CheckVar1=tk.IntVar()CheckVar2=tk.IntVar()CheckVar3=tk.IntVar()C1=tk.Checkbutton(top,text="One",variable=CheckVar1,\onvalue=1,offvalue=0,height=1,\width=20)C2=tk.Checkbutton(top,text="Two",variable=CheckVar2,\onvalue=1,offvalue=0,height=1,\width=20)C3=tk.Checkbutton(top,text="Three",variable=CheckVar3,\onvalue=1,offvalue=0,height=1,\width=20)C1.pack()C2.pack()C3.pack()top.mainloop()6.4参考程序importtkinterasTK#主窗口root=TK.Tk()root.title("Caculator")root.resizable(0,0)root.geometry('320x420')result=TK.StringVar()equation=TK.StringVar()result.set('')equation.set('0')#获得按下的数字或者符号defgetnum(num):temp=equation.get()temp2=result.get()print(temp)print(temp2)iftemp2!='':temp='0'temp2=''result.set(temp2)if(temp=='0'):temp=''temp=temp+numequation.set(temp)print(equation)#按下退格键时，去除最后一个字符defback():temp=equation.get()equation.set(temp[:-1])#按下MC时，清空算式行与结果行defclear():equation.set('0')result.set('')#按下等于号时计算结果defrun():temp=equation.get()temp=temp.replace('x','*')temp=temp.replace('÷','/')print(temp)answer=eval(temp)answer='%.2f'%answerresult.set(str(answer))#结果显示框show_uresult=TK.Label(root,bg='white',fg='black',font=('Arail','15'),bd='0',textvariable=equation,anchor='se')show_dresult=TK.Label(root,bg='white',fg='black',font=('Arail','30'),bd='0',textvariable=result,anchor='se')show_uresult.place(x='10',y='10',width='300',height='50')show_dresult.place(x='10',y='60',width='300',height='50')#按钮#第1行按钮button_7=TK.Button(root,text='7',bg='DarkGray',command=lambda:getnum('7'))button_7.place(x='10',y='150',width='60',height='40')button_8=TK.Button(root,text='8',bg='DarkGray',command=lambda:getnum('8'))button_8.place(x='90',y='150',width='60',height='40')button_9=TK.Button(root,text='9',bg='DarkGray',command=lambda:getnum('9'))button_9.place(x='170',y='150',width='60',height='40')button_multiplication=TK.Button(root,text='X',bg='DarkGray',command=lambda:getnum('x'))button_multiplication.place(x='250',y='260',width='60',height='40')#第2行按钮button_4=TK.Button(root,text='4',bg='DarkGray',command=lambda:getnum('4'))button_4.place(x='10',y='205',width='60',height='40')button_5=TK.Button(root,text='5',bg='DarkGray',command=lambda:getnum('5'))button_5.place(x='90',y='205',width='60',height='40')button_6=TK.Button(root,text='6',bg='DarkGray',command=lambda:getnum('6'))button_6.place(x='170',y='205',width='60',height='40')button_minus=TK.Button(root,text='—',bg='DarkGray',command=lambda:getnum('-'))button_minus.place(x='250',y='205',width='60',height='40')#第3行按钮button_1=TK.Button(root,text='1',bg='DarkGray',command=lambda:getnum('1'))button_1.place(x='10',y='260',width='60',height='40')button_2=TK.Button(root,text='2',bg='DarkGray',command=lambda:getnum('2'))button_2.place(x='90',y='260',width='60',height='40')button_3=TK.Button(root,text='3',bg='DarkGray',command=lambda:getnum('3'))button_3.place(x='170',y='260',width='60',height='40')button_plus=TK.Button(root,text='+',bg='DarkGray',command=lambda:getnum('+'))button_plus.place(x='250',y='150',width='60',height='40')#第4、5按钮button_MC=TK.Button(root,text='C',bg='DarkGray',command=clear)button_MC.place(x='90',y='370',width='60',height='40')button_0=TK.Button(root,text='0',bg='DarkGray',command=lambda:getnum('0'))button_0.place(x='10',y='315',width='140',height='40')button_point=TK.Button(root,text='.',bg='DarkGray',command=lambda:getnum('.'))button_point.place(x='170',y='315',width='60',height='40')button_equal=TK.Button(root,text='=',bg='DarkGray',command=run)button_equal.place(x='170',y='370',width='140',height='40')button_back=TK.Button(root,text='<-',bg='DarkGray',comman