Python练习-天已经亮了计算器也终于完成了

 # 编辑者：闫龙
 import re #导入re模块(正则表达式)
 calc2 = "1-2*((60-30+(-40/52)*(9-2*5/3+7/3*-99/4*2998+10*568/14))-(-4*3)/(16-3*2))"
 calc1 = "1-2*((60-30+(-40/5)*(9-2*5/3+7/3*99/4*2998+10*568/14))-(-4*3)/(16-3*2))"
 calc = "1-2*((60*30+(-40/5)*(9*2*5/3+7/3*99/4*2998+10*568/14))-(-4*32)/(16-3*2))"
 def Format(Str):
     "格式化运算式"
     Str = Str.replace("+-","-")
     Str = Str.replace("-+", "-")
     Str = Str.replace("++", "+")
     Str = Str.replace("--", "+")
     return Str
 def SumCut(Str):
     while re.search("-?[0-9]+\.?[0-9]*[-+][0-9]+\.?[0-9]*",Str):
         newRes= re.search("-?[0-9]+\.?[0-9]*[-+][0-9]+\.?[0-9]*",Str)
         WhatIs = newRes.group()
         if(WhatIs.find("-") > 0):
             l = WhatIs.split("-")
             Str = Str.replace(WhatIs,str(float(l[0])-float(l[1])))
         elif(WhatIs.find("+") > 0):
             l = WhatIs.split("+")
             Str = Str.replace(WhatIs,str(float(l[0])+float(l[1])))
     return Str.replace("(","").replace(")","")
 def MulDiv(Str):
     while re.search("-?[0-9]+\.?[0-9]*[/*].?[0-9]+\.?[0-9]*",Str):
         newRes= re.search("-?[0-9]+\.?[0-9]*[/*].?[0-9]+\.?[0-9]*",Str)
         WhatIs = newRes.group()
         if(WhatIs.find("/") > 0):
             l = WhatIs.split("/")
             Str = Str.replace(WhatIs,str(float(l[0])/float(l[1])))
         elif(WhatIs.find("*") > 0):
             l = WhatIs.split("*")
             if(float(l[0])<0 and float(l[1])<0):
                 Str = Str.replace(WhatIs, "+"+str(float(l[0]) * float(l[1])))
             else:
                 Str = Str.replace(WhatIs,str(float(l[0])*float(l[1])))
     return Format(Str)
 while re.search("\([^()]+\)",calc):
     res = re.search("\([^()]+\)", calc)
     resTwo = MulDiv(Format(res.group()))
     resTwo = SumCut(resTwo)
     calc = calc.replace(res.group(),resTwo)
 else:
     resTwo = MulDiv(calc)
     resTwo = SumCut(resTwo)
     calc = resTwo
 print(calc)

以上,我什么也不想说,睡觉!