Calculator in Python without using eval()

calc.py

  # Take inputs from user as list
  # Then apply this  loop
  # for example user input is (1+2-3)
  # the list is  = ['1','+','2','-','3']
  # it check the opperands in list[2] and do the operation b/w list[1] and list[3] and pops all first three elements in
  # list add the new value in list[1] and operation goes on ......
  for i in range(len(value)):
                try:


                    
            


                  if value[1] == '+':


                      xsum = float(value[0]) + float(value[2])
                      xsum = str(xsum)

                      print(xsum)
                      value.pop(0)

                      value.pop(0)

                      value.pop(0) 
                      print(value)
                      value.insert(0,xsum)
                      print(value)

                  elif value[1] == '-':
                      xdifference = float(value[0]) - float(value[2])
                      xdifference = str(xdifference)
                      value.pop(0)
                    
                      value.pop(0)
                    
                      value.pop(0)
                      print(value) 
                      value.insert(0,xdifference)
                      print(value)
                  elif value[1] == '*':
                      xmultiply = float(value[0]) * float(value[2])
                      xmultiply = str(xmultiply)
                      value.pop(0)
                      value.pop(0)
                      value.pop(0)
                      print(value)
                      value.insert(0,xmultiply)
                  elif value[1] == '/':

                    try:

                        xdivision = float(value[0]) / float(value[2])
                        xdivision = str(xdivision)
                        value.pop(0)
                        value.pop(0)
                        value.pop(0)
                        print(value)
                        value.insert(0,xdivision)
                        print(value)
                    except Exception:
                        label_value.set("not defined")
                    
                        division_error = True

                    value.pop(0)
                    value.pop(0)
                    value.pop(0)
                    print(value)
                    value.insert(0,xdivision)
                    print(value)
                  elif value[1] == '%':
                      xpercentage = 100 * float(value[0])/float(value[2])

                except Exception:
            
                    break