Develop a simple Python calculator

Requirements:

1. Implementation of subtraction and extension priority resolution
2. User Input 1-2 * ((60-30 + ( -40/5) * (9-2*5/3 + 7/3*99/4*2998 +10 * 568/14))-( -4*3)/(16-3*2)) and other similar formulas, you must parse the inside (), +,-, *,/character Number and formula (cannot call Eval and other similar functions lazy implementation), the result of the operation, the results must be consistent with the results of the actual calculator

1 ImportRe2 3 defMain ():4 5A ="'. Join (Input ('Please enter a calculation to calculate the formula'). Split ())6 7      whileTrue:8         if '(' inchA:9ct = Re.search (r'\(([^()]+)\)', a)Ten             ifCt is  notNone: Oneb =ct.groups () [0] Ac =count (b) -A = Re.sub (r'\(([^()]+)\)', str (c), a, 1) -         Else: thec =Count (a) -             Print(c) -              Break -  + defAdd_min (a): -     " " + calculate add and Subtract A :p Aram: at : return: -     " " -  -     if '--' inchA: -A = A.replace ('--','+') -  inc = Re.findall (r'-?\d+\.? \d*', a) -ls = [] to      forIinchC: + Ls.append (float (i)) -Rest =sum (LS) the     returnRest *  $ Panax Notoginseng defMul (a): -     " " the calculate the number of left + :p Aram CT: A : return: the     " " +  -  $b = Re.search (r'\d+\.? \d* (\*-?\d+\.? \d*) +', a) $     ifB is  notNone: -b =B.group () -Rest = 1 thec = Re.findall (r'-?\d+\.? \d*', B) -ls =[]Wuyi          forIteminchC: the ls.append (float (item)) -          forI1inchrange (len (LS)): WuRest = Rest *Ls[i1] -A = Re.sub (r'\d+\.? \d* (\*-?\d+\.? \d*) +', str (rest), a, 1) About         returna $  -  -  - defDiv (a): A     " " + Calculate Departure the :p Aram A: - : return: $     " " the  theb = Re.search (r'\d+\.? \d* (\/-?\d+\.? \d*) +', a) the     ifB is  notNone: theb =B.group () -c = Re.findall (r'-?\d+\.? \d*', B) inls =[] the          forIinchC: the Ls.append (float (i)) AboutRest =Ls[0] the          forI1inchRange (1, Len (LS)): theRest = rest/Ls[i1] theA = Re.sub (r'\d+\.? \d* (\/-?\d+\.? \d*) +', str (rest), a, 1) +         returna -  the Bayi defcount (b): the     " " the Calculation Results - : return: -     " " the      whileTrue: the         if '*' inchB: thec = B.split ('*') the             if '/' inchC[0]: -b =Div (b) the             Else: theb =Mul (b) the         elif '/' inchB:94b =Div (b) the  the         elif '+' or '-' inchB: theb =Add_min (b)98             returnb About         Else: -             returnb101 102 103 104  theMain ()

Develop a simple Python calculator