【中缀转后缀表达式】实现加减乘除计算器
tkinter 实现加减乘除简单计算器，尝试模拟win10 UI
实现计算的核心算法为 中缀表达式 变成后缀表达式 如a+b*c转成abc*+
利用栈实现（数据结构与算法部分）
===========实现计算的核心代码============
def True_cal(str1):
stack = []
final_res = []
marks = ['+', '-', '*', '/']
numbers =
temp_11 = 0
count = 0
for i in str1:
count += 1
if i in numbers:
temp_11 = temp_11 * 10 + int(i)
if i in marks or count == len(str1):
final_res.append(str(temp_11))
temp_11 = 0
if len(stack) != 0:
if i == '*' or i == '/':
while stack[-1] in ['*', '/']:
final_res.append(stack[-1])
stack.pop()
if len(stack) == 0:
break
stack.append(i)
if i == '+' or i == '-':
while stack[-1] in marks:
final_res.append(stack[-1])
stack.pop()
if len(stack) == 0:
break
stack.append(i)
else:
if i in marks:
stack.append(i)
if i == '(' or i == '（':
stack.append(i)
if i == ')' or i == '）':
while stack[-1] != '(':
final_res.append(stack[-1])
stack.pop()
if len(stack) == 0:
break
stack.pop()
for i in range(len(stack)):
final_res.append(stack.pop())
stack = []
f_res = 0
for i in final_res:
if i not in marks:
stack.append(i)
else:
num_houmian = stack.pop()
num_qianmian = stack.pop()
res = str(num_qianmian + i + num_houmian)
stack.append(str(eval(res)))
f_res = stack[-1]
return f_res
===========完整代码===========
from tkinter import *
from tkinter import messagebox, font
from tkinter import Tk, ttk
import tkinter as tk
''
def main():
root = Tk()
root.title('简单的四则计算器')
#root.iconbitmap('i1.ico')
# 窗体居中
Width = 600
Height = 370
canvas = Canvas(width=Width, height=Height, highlightthickness=0, borderwidth=0)
canvas.create_rectangle(0, 0, Width, Height, outline='yellow', fill="pink")
canvas.place(x=0, y=0)
screenwidth = root.winfo_screenwidth()
screenheight = root.winfo_screenheight()
alignstr = '%dx%d+%d+%d' % (Width, Height, (screenwidth - Width) / 2, (screenheight - Height) / 2)
root.geometry(alignstr)
root.focus_set()
root.resizable(width=False, height=False)
# 输入框
input_label = tk.Entry(canvas, font=font.Font(size=20, weight='bold'), width=20)# ,height=1, width=15
input_label.place(x=10, y=45)
input_label.focus_set()
sb = tk.Scrollbar(root)
sb.pack(side="right", fill="y")
# 结果保存
lb = Listbox(canvas, height=14, width=25,font=('微软雅黑',12), yscrollcommand=sb.set)
lb.place(x=350, y=40)
sb.config(command=lb.yview)
def helpme():
# 说明
win2=Toplevel(root)
win2.title('说明文档')
width = 300
height = 250
screenwidth = root.winfo_screenwidth()
screenheight = root.winfo_screenheight()
alignstr2 = '%dx%d+%d+%d' % (width, height, (screenwidth - width) / 2, (screenheight - height) / 2)
win2.geometry(alignstr2)
win2.resizable(width=False,height=False)
win2.focus_set()
Help=Label(win2,text='可以从键盘输入，可以鼠标点击选择\n\n只支持加减乘除四则运算。\n\n允许使用括号运算符\n\nC 清除显示内容和输入内容\n\nCE 只清除输入内容',font=('微软雅黑',10))
Help.place(x=40,y=20)
def about():
#关于
win2 = Toplevel(root)
win2.title('关于')
width = 200
height = 200
screenwidth = root.winfo_screenwidth()
screenheight = root.winfo_screenheight()
alignstr2 = '%dx%d+%d+%d' % (width, height, (screenwidth - width) / 2, (screenheight - height) / 2)
win2.geometry(alignstr2)
win2.resizable(width=False, height=False)
win2.focus_set()
Help = Label(win2, text='#lthero\n\n2021年某月某日\n\n喜欢可打赏', font=('微软雅黑',10))
Help.place(x=50, y=50)
# 头部菜单
menu = Menu(root, tearoff=False)
Cmenu = Menu(menu, tearoff=False)# 新建菜单，删除顶部虚线
Cmenu.add_command(label='说明', command=helpme)# 将内容添加至菜单
Cmenu.add_separator()
Cmenu.add_command(label='关于',command=about)
menu.add_cascade(label='菜单(点我点我)',menu=Cmenu)# 实例化菜单
root.config(menu=menu)# 实例化菜单
# 退出
def esc():
root.quit()
ex = ttk.Button(canvas, text='毁灭吧赶紧的', command=esc)
ex.place(x=100, y=300)
# 公式展示
gongshi_temp=''
temp = StringVar()
temp_res = Label(root, textvariable=temp, font=font.Font(size=16, weight='bold'))
temp_res.place(x=6, y=8)
def True_cal(str1):
stack = []
final_res = []
marks = ['+', '-', '*', '/']
numbers =
temp_11 = 0
count = 0
for i in str1:
count += 1
if i in numbers:
temp_11 = temp_11 * 10 + int(i)
if i in marks or count == len(str1):
final_res.append(str(temp_11))
temp_11 = 0
if len(stack) != 0:
if i == '*' or i == '/':
while stack[-1] in ['*', '/']:
final_res.append(stack[-1])
stack.pop()
if len(stack) == 0:
break
stack.append(i)
if i == '+' or i == '-':
while stack[-1] in marks:
final_res.append(stack[-1])
stack.pop()
if len(stack) == 0:
break
stack.append(i)
else:
if i in marks:
stack.append(i)
if i == '(' or i == '（':
stack.append(i)
if i == ')' or i == '）':
while stack[-1] != '(':
final_res.append(stack[-1])
stack.pop()
if len(stack) == 0:
break
stack.pop()
for i in range(len(stack)):
final_res.append(stack.pop())
stack = []
f_res = 0
for i in final_res:
if i not in marks:
stack.append(i)
else:
num_houmian = stack.pop()
num_qianmian = stack.pop()
res = str(num_qianmian + i + num_houmian)
stack.append(str(eval(res)))
f_res = stack[-1]
return f_res
first_part = ['']
second_part = ['0']
second_part_cheng=['1']
all_part=['']
def cal():
try:
text_ = temp.get()
str1=text_+input_label.get()
#print(str1)
temp.set(str1)
res = True_cal(str1)
input_label.insert(INSERT, res)
# 清空输入，输出结果
input_label.delete(0, END)
input_label.insert(END, res)
# 保存到记录
lb.insert(END, str1 + '=')
lb.insert(END, res)
input_label.focus_set()
temp.set('')
except(ZeroDivisionError, SyntaxError):
messagebox.showerror('!!!', '输入不规范！！！')
input_label.focus_set()
# 清除历史记录
def clear_history():
lb.delete(0, END)
the_button = ttk.Button(root, text='历史记录点我清除,内容可直接复制', command=clear_history).place(x=370, y=5)
flag=
# 全部按键
def start():
# 重复内容
def input_0():
if flag==0:
input_label.delete(0,END)
flag=1
if input_label.get()!='':
input_label.insert(INSERT, '0')
input_label.focus_set()
def input_1():
if flag == 0:
input_label.delete(0, END)
flag = 1
input_label.insert(INSERT, '1')
def input_2():
if flag == 0:
input_label.delete(0, END)
flag = 1
input_label.insert(INSERT, '2')
def input_3():
if flag == 0:
input_label.delete(0, END)
flag = 1
input_label.insert(INSERT, '3')
def input_4():
if flag == 0:
input_label.delete(0, END)
flag = 1
input_label.insert(INSERT, '4')
def input_5():
if flag == 0:
input_label.delete(0, END)
flag = 1
input_label.insert(INSERT, '5')
def input_6():
if flag == 0:
input_label.delete(0, END)
flag = 1
input_label.insert(INSERT, '6')
def input_7():
if flag == 0:
input_label.delete(0, END)
flag = 1
input_label.insert(INSERT, '7')
def input_8():
if flag == 0:
input_label.delete(0, END)
flag = 1
input_label.insert(INSERT, '8')
def input_9():
if flag == 0:
input_label.delete(0, END)
flag = 1
input_label.insert(INSERT, '9')
def input_Point():
input_label.insert(INSERT, '.')
def fun_1():
flag = 0
first_part = second_part
second_part = input_label.get()
input_label.delete(0, END)
str3 = temp.get() + second_part
get_res = True_cal(str3)
text_ = temp.get()
temp.set(text_ + second_part)
input_label.insert(END, get_res)
second_part = get_res
input_label.focus_set()
def fun_2():
flag = 0
first_part = second_part_cheng
second_part_cheng = input_label.get()
input_label.delete(0, END)
str3 = temp.get() + second_part_cheng
get_res = True_cal(str3)
text_ = temp.get()
temp.set(text_ + second_part_cheng)
input_label.insert(END, get_res)
second_part_cheng = get_res
input_label.focus_set()
def input_plus():
input_label.insert(INSERT, '+')
fun_1()
def input_minus(*args):
input_label.insert(INSERT, '-')
fun_1()
def input_mul():
input_label.insert(INSERT, '*')
fun_2()
def input_div():
input_label.insert(INSERT, '/')
fun_2()
def input_equal(*args):
cal()
flag = 0
def input_open():
text_=temp.get()
temp.set(text_+'(')
def input_close():
input_label.insert(INSERT, ')')
def input_clear():
input_label.delete(0, END)
def input_back():
cop = str(input_label.get())
input_label.delete(0, END)
input_label.insert(INSERT, cop)
def input_all_clear():
input_label.delete(0, END)
first_part=''
second_part='0'
temp.set('')
def input_pai():
if flag==1:
input_label.delete(0,END)
flag=0
input_label.insert(END,'3.14159')
def input_e():
if flag==1:
input_label.delete(0,END)
flag=0
flag=0
input_label.insert(END,'2.71828')
def ttt():
messagebox.showinfo('!!!!',' 今天是个好日子\n\n'
'today is a good day!')
col_0 = 30
row_0 = 100
row_1 = 130
col_1 = 85
row_2 = 160
col_2 = 140
row_3 = 190
col_3 = 195
col_4 = 250
row_4 = 220
B0 = ttk.Button(root, text='0', command=input_0,width=6)
B0.place(x=col_2, y=row_4)
B1 = ttk.Button(root, text='1', command=input_1,width=6)
B1.place(x=col_1, y=row_3)
B2 = ttk.Button(root, text='2', command=input_2,width=6)
B2.place(x=col_2, y=row_3)
B3 = ttk.Button(root, text='3', command=input_3,width=6)
B3.place(x=col_3, y=row_3)
B4 = ttk.Button(root, text='4', command=input_4,width=6)
B4.place(x=col_1, y=row_2)
B5 = ttk.Button(root, text='5', command=input_5,width=6)
B5.place(x=col_2, y=row_2)
B6 = ttk.Button(root, text='6', command=input_6,width=6)
B6.place(x=col_3, y=row_2)
B7 = ttk.Button(root, text='7', command=input_7,width=6)
B7.place(x=col_1, y=row_1)
B8 = ttk.Button(root, text='8', command=input_8,width=6)
B8.place(x=col_2, y=row_1)
B9 = ttk.Button(root, text='9', command=input_9,width=6)
B9.place(x=col_3, y=row_1)
BPoint = ttk.Button(root, text='.', command=input_Point,width=6)
BPoint.place(x=col_3, y=row_4)
Bplus = ttk.Button(root, text='+', command=input_plus,width=6)
Bplus.place(x=col_4, y=row_3)
Bminus = ttk.Button(root, text='-', command=input_minus,width=6)
Bminus.place(x=col_4, y=row_2)
root.bind('<KeyPress-KP_Subtract>', input_minus)
Bmul = ttk.Button(root, text='*', command=input_mul,width=6)
Bmul.place(x=col_4, y=row_1)
Bdiv = ttk.Button(root, text='/', command=input_div,width=6)
Bdiv.place(x=col_4, y=row_0)
Bequal = ttk.Button(root, text='=', command=input_equal, width=6)
Bequal.place(x=col_4, y=row_4)
root.bind('<Return>',input_equal)
Bclose = ttk.Button(root, text=')', command=input_close, width=6)
Bclose.place(x=col_1, y=row_4)
Bclear = ttk.Button(root, text='CE', command=input_clear, width=6)
Bclear.place(x=col_1, y=row_0)
Bback = ttk.Button(root, text='<-', command=input_back, width=6)
Bback.place(x=col_3, y=row_0)
Ball_clear = ttk.Button(root, text='C', command=input_all_clear, width=6)
Ball_clear.place(x=col_2, y=row_0)
Bopen = ttk.Button(root,text='(', command=input_open, width=6)
Bopen.place(x=col_0, y=row_4)
Bt1 = ttk.Button(root, text='π', command=input_pai, width=6)
Bt1 .place(x=col_0, y=row_0)
Bt2 = ttk.Button(root, text='e', command=input_e, width=6)
Bt2.place(x=col_0, y=row_1)
Bt3 = ttk.Button(root, text='n!', command=ttt, width=6)
Bt3.place(x=col_0, y=row_2)
Bt4 = ttk.Button(root, text='', command=ttt, width=6)
Bt4.place(x=col_0, y=row_3)
start()
root.mainloop()
if __name__ == '__main__':
main()
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