20212218 实验二《Python程序设计》实验报告

 import  re



flag1 = 1
 while  flag1 == 1 :

    choice = input( "  请选择您想要的计算器类型(0为简单普通计算器、1为复数计算器、2为四则运算计算器、输入E/e退出): \n  "  )  if  choice ==  "  E  "   or  choice ==  "  e  "  :  break 
     if  choice ==  "  0  "  :

        flag2 = 1
         while  flag2 == 1 :

            op = input( "  请输入需要做的操作(+、-、*、/、%、//、**、输入e返回上一级、输入E退出):\n  "  )  if  op ==  "  e  "  :  break 
             if  op ==  "  E  "  :

                flag1 = 0  break  a = int(input( "  请输入操作数a:  "  ))

            b = int(input( "  请输入操作数b:  "  ))  if  op ==  "  +  "  :

                result = a + b  elif  op ==  "  -  "  :

                result = a - b  elif  op ==  "  *  "  :

                result = a * b  elif  op ==  "  /  "  :  if  b == 0:  print ( "  除数不能为0!请重新输入!\n  "  )  continue 
                 else  :

                    result = a / b  elif  op ==  "  %  "  :  if  b == 0:  print ( "  除数不能为0!请重新输入!\n  "  )  continue 
                 else  :

                    result = a % b  elif  op ==  "  //  "  :  if  b == 0:  print ( "  除数不能为0!请重新输入!\n  "  )  continue 
                 else  :

                    result = a // b  elif  op ==  "  **  "  :

                result = a ** b  else  :  print ( "  输入有误，请重新输入！\n  "  )  continue 
             print (a, op, b,  "  =  "  , result)  elif  choice ==  "  1  "  :

        flag3 = 1
         while  flag3 == 1 :

            op = input( "  请输入需要做的操作(+、-、*、/、输入e返回上一级、输入E退出):\n  "  )  if  op ==  "  e  "  :  break 
             if  op ==  "  E  "  :

                flag1 = 0  break  a = complex(input( "  请输入第一个复数(形式为a+bj):  "  ))

            b = complex(input( "  请输入第二个复数(形式为a+bj):  "  ))

            result = 0  if  op ==  "  +  "  :

                result = a + b  elif  op ==  "  -  "  :

                result = a - b  elif  op ==  "  *  "  :

                result = a * b  elif  op ==  "  /  "  :

                result = a / b  else  :  print ( "  输入有误，请重新输入！\n  "  )  print (a, op, b,  "  =  "  , result)  if  choice ==  '  2  '  :

        flag4 = 1
         while  flag4 == 1 :

            a = input( "  请输入一个四则运算式，我们将为您一步解出答案输入(输入e返回上一级、输入E退出):\n  "  )  if  a ==  "  e  "  :  break 
             if  a ==  "  E  "  :

                flag1 = 0  break 

             def  division(n):

                list1 = re.findall( '  [\d\.]+|\(|\+|\-|\*|\/|\)  '  , n)  return  list1  def  change(n, m):  if  n[m] ==  '  -  '  :  if  n[m - 1] ==  '  +  '  :

                        n[m - 1] =  '  -  ' 
                         del  n[m]  elif  n[m - 1] ==  '  -  '  :

                        n[m - 1] =  '  +  ' 
                         del  n[m]  return  n  def  senior(n):

                s_count = 0  for  i  in  n:  if  i ==  '  *  '  :  if  n[s_count + 1] !=  '  -  '  :  

                            n[s_count - 1] = float(n[s_count - 1]) * float(n[s_count + 1 ])  del  n[s_count]  del  n[s_count]  elif  n[s_count + 1] ==  '  -  '  : 

                            n[s_count] = float(n[s_count - 1]) * float(n[s_count + 2 ])

                            n[s_count - 1] =  '  -  ' 
                             del  n[s_count + 1 ]

                        n = change(n, s_count - 1 )  return  senior(n)  elif  i ==  '  /  '  :  if  n[s_count + 1] !=  '  -  ' :   #  3*2 
                            n[s_count - 1] = float(n[s_count - 1]) / float(n[s_count + 1 ])  del  n[s_count]  del  n[s_count]  elif  n[s_count + 1] ==  '  -  ' :   #  3*-2 
                            n[s_count] = float(n[s_count - 1]) / float(n[s_count + 2 ])

                            n[s_count - 1] =  '  -  ' 
                             del  n[s_count + 1 ]

                        n = change(n, s_count - 1 )  return  senior(n)

                    s_count = s_count + 1

                 return  n  def  junior(n):

                j_count = 0  if  n[0] ==  '  -  '  :

                    sum = 0  else  :

                    sum = float(n[0])  for  i  in  n:  if  i ==  '  -  '  :

                        sum = sum - float(n[j_count + 1 ])  if  i ==  '  +  '  :

                        sum = sum + float(n[j_count + 1 ])

                    j_count = j_count + 1

                 if  sum >= 0:

                    n = [str(sum)]  else  :

                    n = [ '  -  ' , str(- sum)]  return  n  def  calculate(n):  if   '  *  '   in  n  or   '  /  '   in  n:

                    n = senior(n)  if   '  +  '   in  n  or   '  -  '   in  n:

                    n = junior(n)  return  n  def  no_bracket(n):

                left_bracket = 0

                count = 0  for  i  in  n:  if  i ==  '  (  '  :

                        left_bracket = count  if  i ==  '  )  '  :

                        part = n[left_bracket + 1 : count]

                        resule_of_part = calculate(part)

                        n = n[: left_bracket] + resule_of_part + n[count + 1 :]

                        n = change(n, left_bracket)  return  no_bracket(n)

                    count = count + 1
                 return  n  def  main(n):

                n_list = division(n)

                n_list1 = no_bracket(n_list)

                answer = calculate(n_list1)  if  len(answer) == 2 :

                    answer = -float(answer[1 ])  else  :

                    answer = float(answer[0])  return  answer

            b = main(a)  print (f "  {a} = {b}  " )