1 import re
2 class Calculator():
3 '''
4 Calculator
5 '''
6 def run(self, equation):
7 '''
8 main
9 '''
10 equation = equation.replace(' ','')
11 while True:
12 result = re.search('\([^(^)]+\)', equation)
13 if result:
14 equation_min = self.Equation_dispose(result.group())
15 value = str(self.A_S(equation_min))
16 equation = equation.replace(result.group(), value)
17 equation = self.format(equation)
18 else:break
19 equation = self.format(equation)
20 sum = self.A_S(self.Equation_dispose(equation))
21 print(sum)
22
23 def M_D(self, equation):
24 '''
25 multiply-divide
26 '''
27 equation = equation.replace(' ','')
28 if "*" in equation:
29 a,b = equation.split('*')
30 return str(float(a) * float(b))
31 if "/" in equation:
32 a,b = equation.split('/')
33 return str(float(a) / float(b))
34
35 def A_S(self, equation):
36 '''
37 add-sub
38 '''
39 # equation
40 ret = re.findall('[+-]?\d+(?:\.\d+)?', equation)
41 sum = 0
42 for x in ret:
43 sum += float(x)
44 return sum
45
46 def Equation_dispose(self, equation):
47 '''
48 Equation-format
49 '''
50 while True:
51 result1 = re.search('\d+(\.\d+)?[*/]\d+(\.\d+)?', equation)
52 if result1:
53 result1 = result1.group()
54 result2 = self.M_D(result1)
55 equation = equation.replace(result1, result2)
56 else:return equation
57
58 def format(self, equation):
59 equation = equation.replace('+-', '-')
60 equation = equation.replace('--', '+')
61 equation = equation.replace('-+', '-')
62 equation = equation.replace('++', '+')
63 return equation
64
65 equation = input("")
66 calculator = Calculator()
67 calculator.run(equation)
