#!/usr/local/bin/python3 # -*- coding:utf-8 -*- # AUTHOR:Howard hao # a = ‘1 - 2 * ( (60-30 +(-40/5) * (9-2*5/3 + 7 /3*99/4*2998 +10 * 568/14 )) - (-4*3)/ (16-3*2) )‘ import re def main(): a = input(‘输入算式:‘) while ‘(‘ in a: print(‘a = ‘,a) b = re.search(‘\(([^()]+)\)‘,a).groups()[0] print(‘b = ‘,b) a = re.sub(‘\([^()]+\)‘,str(calculate(b)),a,1) print(‘替换后a = ‘,a) else: print(‘The result is‘,calculate(a)) #计算乘除加减(分步计算乘除) def md(e): if ‘*‘ in e: E = re.split(‘\*‘, e,1) E1 = E[0].replace(‘ ‘,‘‘) E2 = E[1].replace(‘ ‘,‘‘) return float(E1)*float(E2) elif ‘/‘ in e: E = re.split(‘/‘, e,1) E1 = E[0].replace(‘ ‘, ‘‘) E2 = E[1].replace(‘ ‘, ‘‘) return float(E1)/float(E2) else: e = e.replace(‘ ‘, ‘‘).replace(‘++‘, ‘+‘).replace(‘+-‘, ‘-‘).replace(‘--‘,‘+‘) e = re.findall(‘[+-]?\d+\.?\d*‘, e) l = [] for i in e: if ‘.‘ in i: l.append(float(i)) else: l.append(int(i)) else: return sum(l) #截取一段计算传回md函数计算 def calculate(c): while ‘*‘ in c or ‘/‘ in c: print(‘c = ‘,c) d = re.search(‘\s*[+-]?\s*\d+\.?\d*\s*[*/]\s*[+-]?\s*\d+\.?\d*‘,c).group() print(‘d = ‘,d) # break c = re.sub(‘\s*[+-]?\s*\d+\.?\d*\s*[*/]\s*[+-]?\s*\d+\.?\d*‘,‘‘‘+‘‘‘ + str(md(d)),c,1) print(‘c = ‘,c) else: return md(c) main()
时间: 2024-10-09 22:33:21