#antuor:Alan
importre
fromfunctoolsimportreduce
fromtkinterimport*
'''处理特殊－号运算'''
defminus_operation(expresstion):
minus_operators=re.split("-",expresstion)
calc_list=re.findall("[0-9]",expresstion)
ifminus_operators[0]=="":
calc_list[0]='-%s'%calc_list[0]
res=reduce(lambdax,y:float(x)-float(y),calc_list)
print(">>>>>>>>>>>>>>减号[%s]运算结果:"%expresstion,res)
returnres
'''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'''
defdel_duplicates(expresstion):
expresstion=expresstion.replace("++","+")
expresstion=expresstion.replace("--","-")
expresstion=expresstion.replace("+-","-")
expresstion=expresstion.replace("--","+")
expresstion=expresstion.replace('- -',"+")
e
returnexpresstion
'''＊／运算函数'''
defmutiply_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
forindex,iinenumerate(calc_list):
ifres:
ifoperators[index-1]=='*':
res*=float(i)
elifoperators[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)
returnres
'''处理运算符号顺序混乱情况'''
defspecial_features(plus_and_minus_operators,multiply_and_dividend):
forindex,iinenumerate(multiply_and_dividend):
i=i.strip()
ifi.endswith("*")ori.endswith("/"):
multiply_and_dividend[index]=multiply_and_dividend[index]+plus_and_minus_operators[index]+multiply_and_dividend[index+1]
delmultiply_and_dividend[index+1]
delplus_and_minus_operators[index]
returnplus_and_minus_operators,multiply_and_dividend
defminus_special(operator_list,calc_list):
forindex,iinenumerate(calc_list):
ifi=='':
calc_list[index+1]=i+calc_list[index+1].strip()
'''运算除了（）的公式＋－＊／'''
deffigure_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)
iflen(multiply_and_dividend[0].strip())==0:
multiply_and_dividend[1]=plus_and_minus_operators[0]+multiply_and_dividend[1]
delmultiply_and_dividend[0]
delplus_and_minus_operators[0]
plus_and_minus_operators,multiply_and_dividend=special_features(plus_and_minus_operators,multiply_and_dividend)
forindex,iinenumerate(multiply_and_dividend):
ifre.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
forindex,iteminenumerate(multiply_and_dividend):
iffinal_res:
ifplus_and_minus_operators[index-1]=='+':
final_res+=float(item)
elifplus_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)
returnfinal_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"""
defcalculate():
expresstion=expresstions.get() #获取输入框值
flage=True
calculate_res=None #初始化计算结果为None
whileflage:
m=re.search("\([^()]*\)",expresstion) #先找最里层的（）
# pattern = re.compile(r"\([^()]*\)")
# m = pattern.match(expresstion)
ifm:
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
