1 import sys 2 import re 3 4 def deal_fuhao(calc_list): 5 new_calc_list=[] 6 for index,item in enumerate(calc_list): 7 if item.strip().endswith('*') or item.strip().endswith('/'): 8 new_calc_list.append('%s-%s'%(calc_list[index],calc_list[index+1])) 9 elif ('*'or'/') in item: 10 new_calc_list.append(item) 11 print(new_calc_list) 12 return new_calc_list 13 14 def jianfa(formula): 15 print('运算',formula) 16 print(formula) 17 formula = formula.replace('+-', "-") 18 formula = formula.replace('++', "+") 19 formula = formula.replace('-+', "-") 20 formula = formula.replace('--', "+") 21 22 calc_list=re.split('[+-]',formula) 23 sub_calc_list = re.findall('[+-]', formula) 24 print(calc_list,sub_calc_list) 25 sub_res=None 26 for index,item in enumerate(calc_list): 27 if sub_res: #这不是第一次 28 if sub_calc_list[index-1]=="-": 29 sub_res -= float(item) 30 else: 31 sub_res += float(item) 32 else: 33 sub_res=float(item) #这里其实就是赋值，然后用于上边的计算 34 print(' 33[31;1m[%s] 33[0m' %sub_res) 35 print(eval(formula)) 36 def chengchu(formula): 37 print('运算',formula) 38 calc_list=re.split('[+-]',formula) 39 calc_list =deal_fuhao(calc_list) 40 print(calc_list) 41 42 for item in calc_list: 43 sub_calc_list=re.split('[*/]',item) 44 sub_operator_list=re.findall('[*/]',item) 45 print(sub_calc_list,sub_operator_list) 46 sub_res=None 47 for index,i in enumerate(sub_calc_list): 48 if sub_res: #这不是第一次 49 if sub_operator_list[index-1]=='*': 50 sub_res *= float(i) 51 else: 52 sub_res /= float(i) 53 else: 54 sub_res = float(i) 55 56 print(' 33[31;1m[%s]= 33[0m'%item,sub_res) 57 formula = formula.replace(item,str(sub_res)) 58 59 print(' 33[31;1m[%s]结果 33[0m',formula) 60 res_zuizhong =jianfa(formula) 61 62 def calc(formula): 63 parentheses_flag = True 64 while parentheses_flag: 65 m=re.search('([^()]+)',formula) 66 if m: 67 print(m.group()) 68 sub_formula=m.group().strip('()') 69 sub_res=chengchu(sub_formula) 70 break 71 72 if __name__=='__main__': 73 formula = '1-2*(60-30+ (-40.0/5*(9-2*5/-3+7/3*99/4*2998+10*568/14)))-(-4*3)/(16-3*2)' 74 res = calc(formula)
1 C:UsersqiangqlAppDataLocalProgramsPythonPython36-32python.exe C:/Users/qiangql/PycharmProjects/untitled1/计算器2.py 2 (9-2*5/-3+7/3*99/4*2998+10*568/14) 3 运算 9-2*5/-3+7/3*99/4*2998+10*568/14 4 ['2*5/-3', '7/3*99/4*2998', '10*568/14'] 5 ['2*5/-3', '7/3*99/4*2998', '10*568/14'] 6 ['2', '5', '-3'] ['*', '/'] 7 [2*5/-3]= -3.3333333333333335 8 ['7', '3', '99', '4', '2998'] ['/', '*', '/', '*'] 9 [7/3*99/4*2998]= 173134.50000000003 10 ['10', '568', '14'] ['*', '/'] 11 [10*568/14]= 405.7142857142857 12 [%s]结果 9--3.3333333333333335+173134.50000000003+405.7142857142857 13 运算 9--3.3333333333333335+173134.50000000003+405.7142857142857 14 9--3.3333333333333335+173134.50000000003+405.7142857142857 15 ['9', '3.3333333333333335', '173134.50000000003', '405.7142857142857'] ['+', '+', '+'] 16 [173552.54761904766] 17 173552.54761904766 18 19 Process finished with exit code 0