└── simple cal.py


/simple cal.py:
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 1 | from tkinter import *
 2 |  
 3 | def iCalc(source, side):
 4 |     storeObj = Frame(source, borderwidth=4, bd=4, bg="powder blue")
 5 |     storeObj.pack(side=side, expand =YES, fill =BOTH)
 6 |     return storeObj
 7 |  
 8 | def button(source, side, text, command=None):
 9 |     storeObj = Button(source, text=text, command=command)
10 |     storeObj.pack(side=side, expand = YES, fill=BOTH)
11 |     return storeObj
12 |  
13 | class app(Frame):
14 |     def __init__(self):
15 |         Frame.__init__(self)
16 |         self.option_add('*Font', 'arial 20 bold')
17 |         self.pack(expand = YES, fill =BOTH)
18 |         self.master.title('Calculator')
19 |  
20 |         display = StringVar()
21 |         Entry(self, relief=RIDGE, textvariable=display,
22 |           justify='right'
23 |           , bd=30, bg="powder blue").pack(side=TOP,
24 |                                           expand=YES, fill=BOTH)
25 |  
26 |         for clearButton in (["C"]):
27 |             erase = iCalc(self, TOP)
28 |             for ichar in clearButton:
29 |                 button(erase, LEFT, ichar, lambda
30 |                     storeObj=display, q=ichar: storeObj.set(''))
31 |  
32 |         for numButton in ("789/", "456*", "123-", "0.+"):
33 |          FunctionNum = iCalc(self, TOP)
34 |          for iEquals in numButton:
35 |             button(FunctionNum, LEFT, iEquals, lambda
36 |                 storeObj=display, q=iEquals: storeObj
37 |                    .set(storeObj.get() + q))
38 |  
39 |         EqualButton = iCalc(self, TOP)
40 |         for iEquals in "=":
41 |             if iEquals == '=':
42 |                 btniEquals = button(EqualButton, LEFT, iEquals)
43 |                 btniEquals.bind('<ButtonRelease-1>', lambda e,s=self,
44 |                                 storeObj=display: s.calc(storeObj), '+')
45 |  
46 |  
47 |             else:
48 |                 btniEquals = button(EqualButton, LEFT, iEquals,
49 |                                     lambda storeObj=display, s=' %s ' % iEquals: storeObj.set
50 |                                     (storeObj.get() + s))
51 |  
52 |     def calc(self, display):
53 |             try:
54 |                 display.set(eval(display.get()))
55 |             except:
56 |                 display.set("ERROR")
57 |  
58 |  
59 | if __name__=='__main__':
60 |  app().mainloop()
61 |  
62 | 


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