python正则表达式之作业计算器

#!/usr/bin/env python3
#antuor:Alan
 
import re
from functools import reduce
from tkinter import *
 
 
 
'''处理特殊－号运算'''
def minus_operation(expresstion):
 minus_operators = re.split("-",expresstion)
 calc_list = re.findall("[0-9]",expresstion)
 if minus_operators[0] =="":
  calc_list[0] = '-%s' % calc_list[0]
 res = reduce(lambda x,y:float(x)-float(y),calc_list)
 print(">>>>>>>>>>>>>>减号[%s]运算结果:" % expresstion,res)
 return res
 
'''reduce()对sequence连续使用function, 如果不给出initial, 则第一次调用传递sequence的两个元素,
以后把前一次调用的结果和sequence的下一个元素传递给function'''
 
 
 
 
'''处理双运算符号'''
def del_duplicates(expresstion):
 expresstion = expresstion.replace("++","+")
 expresstion = expresstion.replace("--","-")
 expresstion = expresstion.replace("+-","-")
 expresstion = expresstion.replace("--","+")
 expresstion = expresstion.replace('- -',"+")
 e
 return expresstion
 
'''＊／运算函数'''
def mutiply_dividend(expresstion):
 calc_list = re.split("[*/]",expresstion)   #用＊ or /分割公式
 operators = re.findall("[*/]",expresstion)  #找出所有＊和／号
 res = None
 for index,i in enumerate(calc_list):
  if res:
   if operators[index-1] =='*':
    res *= float(i)
   elif operators[index-1] =='/':
    res /=float(i)
  else :
   res = float(i)
 procession0 = "[%s]运算结果=" % expresstion,res
 final_result.insert(END,procession0)  #插入窗体
 print(procession0)
 return res
 
 
 
'''处理运算符号顺序混乱情况'''
def special_features(plus_and_minus_operators,multiply_and_dividend):
 
 for index,i in enumerate(multiply_and_dividend):
  i = i.strip()
  if i.endswith("*") or i.endswith("/"):
   multiply_and_dividend[index] = multiply_and_dividend[index] + plus_and_minus_operators[index] + multiply_and_dividend[index+1]
   del multiply_and_dividend[index+1]
   del plus_and_minus_operators[index]
 return plus_and_minus_operators,multiply_and_dividend
 
 
 
def minus_special(operator_list,calc_list):
 for index,i in enumerate(calc_list):
  if i =='':
   calc_list[index+1] = i + calc_list[index+1].strip()
 
 
 
'''运算除了（）的公式＋－＊／'''
def figure_up(expresstion):
 expresstion = expresstion.strip("()")  #去掉外面括号
 expresstion = del_duplicates(expresstion) #去掉重复＋－号
 plus_and_minus_operators = re.findall("[+-]",expresstion)
 multiply_and_dividend = re.split("[+-]",expresstion)
 if len(multiply_and_dividend[0].strip()) ==0:
  multiply_and_dividend[1] = plus_and_minus_operators[0] + multiply_and_dividend[1]
  del multiply_and_dividend[0]
  del plus_and_minus_operators[0]
 
 plus_and_minus_operators,multiply_and_dividend = special_features(plus_and_minus_operators,multiply_and_dividend)
 for index,i in enumerate(multiply_and_dividend):
  if re.search("[*/]",i):
   sub_res = mutiply_dividend(i)
   multiply_and_dividend[index] = sub_res
 
 print(multiply_and_dividend,plus_and_minus_operators) #计算
 final_res = None
 for index,item in enumerate(multiply_and_dividend):
  if final_res:
   if plus_and_minus_operators[index-1] == '+':
    final_res += float(item)
   elif plus_and_minus_operators[index-1] == '-':
    final_res -= float(item)
  else:
   final_res = float(item)
 procession = '[%s]计算结果:' % expresstion,final_res
 final_result.insert(END,procession)  #插入窗体
 print(procession)
 return final_res
 
"""主函数：运算逻辑：先计算拓号里的值,算出来后再算乘除,再算加减"""
def calculate():
 expresstion = expresstions.get()     #获取输入框值
 flage = True
 calculate_res = None        #初始化计算结果为None
 while flage:
  m = re.search("\([^()]*\)",expresstion)  #先找最里层的（）
  # pattern = re.compile(r"\([^()]*\)")
  # m = pattern.match(expresstion)
  if m:
   sub_res = figure_up(m.group())   #运算（）里的公式
   expresstion = expresstion.replace(m.group(),str(sub_res)) #运算完毕把结果替换掉公式
  else:
   print('---------------括号已经计算完毕--------------')
   procession1 = "最终计算结果:",figure_up(expresstion)
   final_result.insert(END,procession1)  #插入窗体
   print('\033[31m最终计算结果:',figure_up(expresstion))
 
   flage = False
 
 
if __name__=="__main__":
 # res = calculate("1 - 2 * ( (60-30 +(-40/5) * (9-2*5/3 + 7 /3*99/4*2998 +10 * 568/14 )) - (-4*3)/ (16-3*2) )")
 window = Tk()     ###创建窗体
 window.title('计算器')  ###命名窗体
 frame1 = Frame(window)  ###框架1
 frame1.pack()    ###放置
 frame2 = Frame(window)  ###框架2
 frame2.pack()    ###放置
 lable = Label(frame1,text = "请输入公式：") ###文字标签
 lable.pack()
 expresstions = StringVar() ###输入框属性，字符串
 entryname = Entry(frame1,textvariable = expresstions) ###文本输入框
 bt_get_expresstions = Button(frame1,text = "提交",command = calculate) ###按钮挂件
 bt_get_expresstions.pack()
 entryname.pack()
 lable.grid(row =1,column =1) ###位置
 entryname.grid(row=1,column =2)
 bt_get_expresstions.grid(row =1,column =3)
 final_result = Text(frame2) ###计算结果显示框
 final_result.tag_config("here", background="yellow", foreground="blue")
 final_result.pack()
 window.mainloop()    ###事件循环