python计算器

代码中肯定还有一些思维漏洞，望参考者留言交流。
界面：
演示视频：https://files.cnblogs.com/files/acm-jing/calculator.rar
代码:
  1 # coding=utf-8
  2 from tkinter import *
  3 import math
  4 import re
  5 
  6 
  7 #the main gui
  8 window=Tk()
  9 window.title('Calculator')
 10 window.geometry('450x260')
 11 mainFrame=Frame(bg='black')
 12 
 13 #-----------button click event
 14 def ButtonClick(buttonText): #except '=',use to show the expression on the entry
 15     global showRes,res,oneInput
 16     if buttonText!='clear' and buttonText!='back':
 17         oneInput.append(buttonText)
 18         showRes=showRes+buttonText
 19     elif buttonText=='clear':
 20         showRes=''
 21         oneInput.clear()
 22     else:
 23         if showRes!='':
 24             showRes=showRes[0:len(showRes)-len(oneInput.pop())]
 25     res.set(showRes)
 26 
 27 def MultDiv(expression,op):#multiply and divid operations
 28     loc=expression.index(op)
 29     if op=='×' and expression[loc+1]!='-':
 30         tempRes=float(expression[loc-1])*float(expression[loc+1])
 31     elif op=='÷' and expression[loc+1]!='-':#calculate divid,not:divisor is 0
 32         tempRes = float(expression[loc-1])/float(expression[loc+1])
 33     elif op=='×' and expression[loc+1]=='-':
 34         tempRes = -float(expression[loc - 1]) * float(expression[loc + 2])
 35         del expression[loc-1]
 36     elif op == '÷' and expression[loc + 1] == '-':
 37         tempRes = -float(expression[loc - 1]) / float(expression[loc + 2])
 38         del expression[loc - 1]
 39     del expression[loc-1],expression[loc-1],expression[loc-1]
 40     expression.insert(loc-1,str(tempRes))
 41     return expression
 42 
 43 def SingelValueFunction(expression,loc):
 44     op=expression[loc]
 45     if op=='sin ':
 46         if expression[loc+1]!='-':
 47             temRes=math.sin(float(expression[loc+1]))
 48         else:
 49             temRes=math.sin(-float(expression[loc+2]))
 50             del expression[loc]
 51     elif op=='cos ':
 52         if expression[loc+1]!='-':
 53             temRes=math.cos(float(expression[loc+1]))
 54         else:
 55             temRes=math.cos(-float(expression[loc+2]))
 56             del expression[loc]
 57     elif op=='tan ':
 58         if expression[loc+1]!='-':
 59             temRes=math.tan(float(expression[loc+1]))
 60         else:
 61             temRes=math.tan(-float(expression[loc+2]))
 62             del expression[loc]
 63     elif op=='abs ':
 64         if expression[loc+1]!='-':
 65             temRes=float(expression[loc+1])
 66         else:
 67             temRes=float(expression[loc+2])
 68             del expression[loc]
 69     elif op=='ln ':
 70         if expression[loc+1]!='-':
 71             temRes=math.log(2.718281828,float(expression[loc+1]))
 72         else:
 73             temRes = math.log(2.718281828, -float(expression[loc + 2]))
 74             del expression[loc]
 75     elif op=='sqrt ':
 76         if expression[loc+1]!='-':
 77             temRes=math.sqrt(float(expression[loc+1]))
 78         else:
 79             temRes=math.sqrt(-float(expression[loc+2]))
 80             del expression[loc]
 81    # elif
 82     del expression[loc],expression[loc]
 83     expression.insert(loc,str(temRes))
 84     return expression
 85 
 86 def Pi(expression,op):
 87     loc = expression.index(op)
 88     temRes = 3.1415926535
 89     del expression[loc]
 90     expression.insert(loc,temRes)
 91     return expression
 92 
 93 def E(expression,op):
 94     loc=expression.index(op)
 95     temRes=2.718281828
 96     del expression[loc]
 97     expression.insert(loc,str(temRes))
 98     return expression
 99 
100 def Factorial(expression,op):
101     loc=expression.index(op)
102     temRes=math.factorial(float(expression[loc-1]))
103     del expression[loc-1],expression[loc-1]
104     expression.insert(loc-1,str(temRes))
105     return expression
106 
107 def Power(expression,op):
108     loc=expression.index(op)
109     if expression[loc+1]!='-':
110         temRes=math.pow(float(expression[loc-1]),float(expression[loc+1]))
111     else:
112         temRes = math.pow(float(expression[loc - 1]), -float(expression[loc + 2]))
113         del expression[loc-1]
114     del expression[loc-1],expression[loc-1],expression[loc-1]
115     expression.insert(loc-1,str(temRes))
116     return expression
117 
118 def WithoutBracketsExpressionCalculate(strExpression):
119     expression = re.findall('([d.]+|÷|-|+|×+|sin |cos |tan |ln |abs |sqrt |π|e|!|^)', strExpression)
120     print(expression)
121     if expression[0] == '-':  # negative number
122         expression[0] = expression[0] + expression[1]
123         del expression[1]
124     sum=0
125     #use value to replace the e and π
126     while 'e' in expression:
127         E(expression,'e')
128     while 'π' in expression:
129         Pi(expression,'π')
130     # calculate single value function
131     while '!' in expression:
132         Factorial(expression,'!')
133 
134     singleValueFunctonIndexs=[]
135     for i in range(len(expression)):
136         if expression[i] in ['sin ','cos ','tan ','ln ','abs ','sqrt ']:
137             singleValueFunctonIndexs.append(i)
138     singleValueFunctonNums=len(singleValueFunctonIndexs)
139     for j in range(singleValueFunctonNums):
140         SingelValueFunction(expression,singleValueFunctonIndexs[singleValueFunctonNums-1-j])
141 
142     while '^' in expression:
143         Power(expression,'^')
144 
145     while True:
146         #calculate mul and div first
147         if '×' in expression and '÷'not in expression:
148             MultDiv(expression,'×')
149         elif '×'not in expression and '÷'in expression:
150             MultDiv(expression,'÷')
151         elif '÷'in expression and '×'in expression:
152             locMul=expression.index('×')
153             locDiv=expression.index('÷')
154             if locMul<locDiv:
155                 MultDiv(expression,'×')
156             else:
157                 MultDiv(expression,'÷')
158         #calculate add and minus
159         else:
160 
161             sum+=float(expression[0])
162 
163             for i in range(1,len(expression),2):#step 2
164                 if expression[i]=='+' and expression[i+1]!='-':
165                     sum+=float(expression[i+1])
166                 elif expression[i]=='+' and expression[i+1]=='-':
167                     sum-=float(expression[i+2])
168                 elif expression[i]=='-' and expression[i+1]!='-':
169                     sum-=float(expression[i+1])
170                 elif expression[i]=='-' and expression[i+1]=='-':
171                     sum+=float(expression[i+2])
172             break
173     # if(len(expression)==1):
174     #     return sum
175     # else:
176     #     return 'Syntax ERROR'
177     return sum
178 
179 def WithBracketsExpressionCalculate(expression):
180     leftBrackes=[] #record the location of '('
181     ans=0
182 
183     if '(' not in expression:
184         ans=WithoutBracketsExpressionCalculate(expression)
185         return ans
186 
187     for i in range(len(expression)):
188         if expression[i]=='(':
189             leftBrackes.append(i)
190         elif expression[i]==')':
191             subExpression=expression[leftBrackes[len(leftBrackes)-1]+1:i]
192             tempAns=WithoutBracketsExpressionCalculate(subExpression)
193             expression=expression[0:leftBrackes[len(leftBrackes)-1]]+str(tempAns)+expression[i+1:len(expression)+1]
194             leftBrackes.pop()
195             return WithBracketsExpressionCalculate(expression)
196 
197 
198 def ButtonEqual():
199     global showRes,res,oneInput
200    # expression=re.findall('([d.]+|÷|-|+|×)',showRes)
201     #print(expression)
202     try:
203         showRes=str(WithBracketsExpressionCalculate(showRes))
204     except Exception:
205         showRes='Syntax ERROR'
206     #---------use eval() to calculate the expression
207     #strExpression = ''
208     # for i in range(len(expression)):
209     #     strExpression+=expression[i]
210     #showRes=eval(strExpression)
211     #---------use eval() to calculate the expression
212     #print(oneInput)
213     oneInput.clear()
214     oneInput.append(showRes)
215     res.set(showRes)
216 
217 #------glaobal variabls
218 global showRes
219 global oneInput
220 global res
221 showRes=''
222 oneInput=[]
223 res=StringVar()
224 res.set(showRes)
225 
226 
227 #--------output
228 entryShow=Entry(mainFrame,bg='#121212',foreground='white',font=('TimesNewRoman', '15', 'normal'),borderwidth=6,width=300,textvariable=res)
229 entryShow.pack(padx=5,pady=5)
230 
231 #--------function
232 
233 #sin function
234 buttonSin=Button(mainFrame,command=lambda :ButtonClick(buttonText='sin '),width=3,height=1,bg='#212121',text='sin',font=('TimesNewRoman', '12', 'normal'),foreground='white')
235 buttonSin.place(x=5,y=55)
236 #ln function
237 buttonLn=Button(mainFrame,command=lambda :ButtonClick(buttonText='ln '),width=3,height=1,bg='#212121',text='ln',font=('TimesNewRoman', '12', 'normal'),foreground='white')
238 buttonLn.place(x=60,y=55)
239 #cos
240 buttonCos=Button(mainFrame,command=lambda :ButtonClick(buttonText='cos '),width=3,height=1,bg='#212121',text='cos',font=('TimesNewRoman', '12', 'normal'),foreground='white')
241 buttonCos.place(x=5,y=87)
242 #abs
243 buttonAbs=Button(mainFrame,command=lambda :ButtonClick(buttonText='abs '),width=3,height=1,bg='#212121',text='abs',font=('TimesNewRoman', '12', 'normal'),foreground='white')
244 buttonAbs.place(x=60,y=87)
245 #tan
246 buttonLog=Button(mainFrame,command=lambda :ButtonClick(buttonText='tan '),width=3,height=1,bg='#212121',text='tan',font=('TimesNewRoman', '12', 'normal'),foreground='white')
247 buttonLog.place(x=5,y=119)
248 #e
249 buttonE=Button(mainFrame,command=lambda :ButtonClick(buttonText='e'),width=3,height=1,bg='#212121',text='e',font=('TimesNewRoman', '12', 'normal'),foreground='white')
250 buttonE.place(x=60,y=119)
251 #pi
252 buttonPI=Button(mainFrame,command=lambda :ButtonClick(buttonText='π'),width=3,height=1,bg='#212121',text='π',font=('TimesNewRoman', '12', 'normal'),foreground='white')
253 buttonPI.place(x=5,y=151)
254 #^
255 buttonIndex=Button(mainFrame,command=lambda :ButtonClick(buttonText='^'),width=3,height=1,bg='#212121',text='^',font=('TimesNewRoman', '12', 'normal'),foreground='white')
256 buttonIndex.place(x=60,y=151)
257 #!
258 buttonFactorial=Button(mainFrame,command=lambda :ButtonClick(buttonText='!'),width=3,height=1,bg='#212121',text='!',font=('TimesNewRoman', '12', 'normal'),foreground='white')
259 buttonFactorial.place(x=5,y=183)
260 #sqrt
261 buttonSqrt=Button(mainFrame,command=lambda :ButtonClick(buttonText='sqrt '),width=3,height=1,bg='#212121',text='√',font=('TimesNewRoman', '12', 'normal'),foreground='white')
262 buttonSqrt.place(x=60,y=183)
263 #clear
264 buttonClear=Button(mainFrame,command=lambda :ButtonClick(buttonText='clear'),width=3,height=1,bg='#212121',text='clear',font=('TimesNewRoman', '12', 'normal'),foreground='white')
265 buttonClear.place(x=5,y=215)
266 #back
267 buttonBack=Button(mainFrame,command=lambda :ButtonClick(buttonText='back'),width=3,height=1,bg='#212121',text='back',font=('TimesNewRoman', '12', 'normal'),foreground='white')
268 buttonBack.place(x=60,y=215)
269 #---------number
270 
271 #7
272 button7=Button(mainFrame,command=lambda :ButtonClick(buttonText='7'),width=3,height=2,bg='#424242',text='7',font=('TimesNewRoman', '12', 'normal'),foreground='white')
273 button7.place(x=140,y=55)
274 #8
275 button8=Button(mainFrame,command=lambda :ButtonClick(buttonText='8'),width=3,height=2,bg='#424242',text='8',font=('TimesNewRoman', '12', 'normal'),foreground='white')
276 button8.place(x=195,y=55)
277 #9
278 button9=Button(mainFrame,command=lambda :ButtonClick(buttonText='9'),width=3,height=2,bg='#424242',text='9',font=('TimesNewRoman', '12', 'normal'),foreground='white')
279 button9.place(x=250,y=55)
280 #4
281 button4=Button(mainFrame,command=lambda :ButtonClick(buttonText='4'),width=3,height=2,bg='#424242',text='4',font=('TimesNewRoman', '12', 'normal'),foreground='white')
282 button4.place(x=140,y=103)
283 #5
284 button5=Button(mainFrame,command=lambda :ButtonClick(buttonText='5'),width=3,height=2,bg='#424242',text='5',font=('TimesNewRoman', '12', 'normal'),foreground='white')
285 button5.place(x=195,y=103)
286 #6
287 button6=Button(mainFrame,command=lambda :ButtonClick(buttonText='6'),width=3,height=2,bg='#424242',text='6',font=('TimesNewRoman', '12', 'normal'),foreground='white')
288 button6.place(x=250,y=103)
289 #1
290 button1=Button(mainFrame,command=lambda :ButtonClick(buttonText='1'),width=3,height=2,bg='#424242',text='1',font=('TimesNewRoman', '12', 'normal'),foreground='white')
291 button1.place(x=140,y=151)
292 #2
293 button2=Button(mainFrame,command=lambda :ButtonClick(buttonText='2'),width=3,height=2,bg='#424242',text='2',font=('TimesNewRoman', '12', 'normal'),foreground='white')
294 button2.place(x=195,y=151)
295 #3
296 button3=Button(mainFrame,command=lambda :ButtonClick(buttonText='3'),width=3,height=2,bg='#424242',text='3',font=('TimesNewRoman', '12', 'normal'),foreground='white')
297 button3.place(x=250,y=151)
298 #0
299 button0=Button(mainFrame,command=lambda :ButtonClick(buttonText='0'),width=10,height=2,bg='#424242',text='0',font=('TimesNewRoman', '12', 'normal'),foreground='white')
300 button0.place(x=140,y=199)
301 #.
302 buttonDot=Button(mainFrame,command=lambda :ButtonClick(buttonText='.'),width=3,height=2,bg='#424242',text='.',font=('TimesNewRoman', '12', 'normal'),foreground='white')
303 buttonDot.place(x=250,y=199)
304 
305 #------------operations
306 #divide
307 buttonDiv=Button(mainFrame,command=lambda :ButtonClick(buttonText='÷'),width=3,height=2,bg='#212121',text='÷',font=('TimesNewRoman', '12', 'normal'),foreground='white')
308 buttonDiv.place(x=335,y=55)
309 #left bracket
310 buttonLBracket=Button(mainFrame,command=lambda :ButtonClick(buttonText='('),width=3,height=2,bg='#212121',text='(',font=('TimesNewRoman', '12', 'normal'),foreground='white')
311 buttonLBracket.place(x=390,y=55)
312 #multiply
313 buttonMul=Button(mainFrame,command=lambda :ButtonClick(buttonText='×'),width=3,height=2,bg='#212121',text='×',font=('TimesNewRoman', '12', 'normal'),foreground='white')
314 buttonMul.place(x=335,y=103)
315 #right bracket
316 buttonRBracket=Button(mainFrame,command=lambda :ButtonClick(buttonText=')'),width=3,height=2,bg='#212121',text=')',font=('TimesNewRoman', '12', 'normal'),foreground='white')
317 buttonRBracket.place(x=390,y=103)
318 #minus
319 buttonMinus=Button(mainFrame,command=lambda :ButtonClick(buttonText='-'),width=3,height=2,bg='#212121',text='-',font=('TimesNewRoman', '12', 'normal'),foreground='white')
320 buttonMinus.place(x=335,y=151)
321 #add
322 buttonMinus=Button(mainFrame,command=lambda :ButtonClick(buttonText='+'),width=3,height=2,bg='#212121',text='+',font=('TimesNewRoman', '12', 'normal'),foreground='white')
323 buttonMinus.place(x=335,y=199)
324 #equal
325 buttonMinus=Button(mainFrame,command=ButtonEqual,width=3,height=5,bg='#212121',text='=',font=('TimesNewRoman', '12', 'normal'),foreground='white')
326 buttonMinus.place(x=390,y=151)
327 
328 mainFrame.pack(expand='yes',fill='both')
329 window.mainloop()
View Code
测试样例：
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原文地址：https://www.cnblogs.com/acm-jing/p/8342131.html