运用PFA的路灯指示牌GUI程序

#!/usr/bin/python2.7

from functools import partial as pto
from Tkinter import Tk,Button,X
from tkMessageBox import showinfo,showwarning,showerror

WARN='warn'
CRIT='crit'
REGU='regu'

SIGNS={
'do not enter':CRIT,
'railroad crossing':WARN,
'55\nspeed limit':REGU,
'wrong way':CRIT,
'merging traffic':WARN,
'one way':REGU
       }

critCB=lambda:showerror('Error','Error Button Pressed')
warnCB=lambda:showwaining('Warning','Warning Button Pressed')
infoCB=lambda:showinfo('Info','Info Button Pressed')


top=Tk()
top.title('Road Signs')
Button(top,text='QUIT',command=top.quit,bg='red',fg='white').pack()


MyButton=pto(Button,top)
CritButton=pto(MyButton,command=critCB,bg='white',fg='red')
WarnButton=pto(MyButton,command=warnCB,bg='blue')
ReguButton=pto(MyButton,command=infoCB,bg='white')

for eachSign in SIGNS:
       signType=SIGNS[eachSign]
       cmd='%sButton(text=%r%s).pack(fill=X,expand=True)'%(signType.title(),eachSign,'.upper()'if signType==CRIT else '.title()')
       eval_r(cmd)
top.mainloop()

运行：