Python偏函式應用舉例-路燈指示牌

小手涼涼發表於2018-11-18
Python函式

偏函式應用舉例：路燈指示牌

 1 #!/usr/bin/env python
 2 # _*_coding:utf-8_*_
 3 # 紅綠燈練習：按照指示型別建立適當當景、背景色的路燈指示牌
 4 from functools import partial as pto
 5 from tkinter import Tk, Button,X
 6 from tkinter.messagebox import showinfo,showwarning,showerror
 7 WARN = `warn`
 8 CRIT = `crit`
 9 REGU = `regu`
10 
11 SIGNS = {
12     `do not enter`:CRIT,
13     `railroad crossing`:WARN,
14     `55
speed limit`:REGU,
15     `wrong way`: CRIT,
16     `merging traffic`: WARN,
17     `one way`: REGU,
18 }
19 
20 critCB = lambda: showerror(`Error`,`Error Button Pressed!`)
21 warnCB = lambda: showwarning(`Warning`,`Warning Button Pressed!`)
22 infoCB = lambda: showinfo(`Info`,`Info Button Pressed!`)
23 
24 
25 root = Tk()
26 root.geometry(`800x400`)
27 root.title(`Road Signs`)
28 Button(root,text=`QUIT`,command=root.quit,bg=`red`,fg=`white`).pack()
29 
30 
31 MyButton = pto(Button,root)
32 CritButton = pto(MyButton,command=critCB,bg=`white`,fg=`red`)
33 WarnButton = pto(MyButton,command = warnCB,bg = `goldenrod1`)
34 ReguButton = pto(MyButton,command = infoCB,bg = `white`)
35 
36 for eachSign in SIGNS:
37     signType = SIGNS[eachSign]
38     cmd = `%sButton(text = %r%s).pack(fill = X,expand = True)` %(
39         signType.title(),eachSign,`.upper()` if signType == CRIT else `.title()`
40     )
41     eval(cmd)
42 
43 root.mainloop()

 

相關文章