Python实现计算器功能
有使用任何模块，仅仅使用基础语句，实现计算器部分功能，有界面，可以实现基础运算、连续多次运算、以及不使用“=”的连续运算（可以显示每步计算的结果），例如5+5+5+5+5，5+3*2-4等。但是，除法在连续运算时，没法运算小数位，因为设置的是int，会直接取整。具体代码如下：
#! /usr/bin/env python#coding=utf-8'''除法在连续运算时，没法运算小数位，因为设置的是int，会直接取整'''from Tkinter import *root = Tk(className = "计算器")root.geometry("500x580")class App:def __init__(self, master):frame1 = Frame(master,borderwidth = 10)frame1.pack()frame2 = Frame(master,borderwidth = 10)frame2.pack()frame3 = Frame(master,borderwidth = 10)frame3.pack()Button(frame2, text = "1",font = ("Courier 20 bold roman"),command=lambda: self.callback(1) ).grid(row=0,column=0)Button(frame2, text = "2",font = ("Courier 20 bold roman"),command=lambda: self.callback(2) ).grid(row=0,column=1)Button(frame2, text = "3",font = ("Courier 20 bold roman"),command=lambda: self.callback(3) ).grid(row=0,column=2)Button(frame2, text = "4",font = ("Courier 20 bold roman"),command=lambda: self.callback(4) ).grid(row=1,column=0)Button(frame2, text = "5",font = ("Courier 20 bold roman"),command=lambda: self.callback(5) ).grid(row=1,column=1)Button(frame2, text = "6",font = ("Courier 20 bold roman"),command=lambda: self.callback(6) ).grid(row=1,column=2)Button(frame2, text = "7",font = ("Courier 20 bold roman"),command=lambda: self.callback(7) ).grid(row=2,column=0)Button(frame2, text = "8",font = ("Courier 20 bold roman"),command=lambda: self.callback(8) ).grid(row=2,column=1)Button(frame2, text = "9",font = ("Courier 20 bold roman"),command=lambda: self.callback(9) ).grid(row=2,column=2)Button(frame2, text = "0",font = ("Courier 20 bold roman"),command=lambda: self.callback(0) ).grid(row=3,column=0)Button(frame2, text = "+",font = ("Courier 20 bold roman"),command=lambda: self.callback1("+") ).grid(row=3,column=1)Button(frame2, text = "-",font = ("Courier 20 bold roman"),command=lambda: self.callback1("-") ).grid(row=3,column=2)Button(frame2, text ="*",font = ("Courier 20 bold roman"),command=lambda: self.callback1("*") ).grid(row=4,column=1)Button(frame2, text ="/",font = ("Courier 20 bold roman"),command=lambda: self.callback1("/") ).grid(row=4,column=2)Button(frame2, text="=",font = ("Courier 20 bold roman"),command=self.result).grid(row=4,column=0)Button(frame3, text="clear",font = ("Courier 20 bold roman"),command=lambda: self.clear() ).grid()label_1 = Label(frame1,text="输入数字")label_1.pack()self.a = IntVar()self.a.set(0)e1 = Entry(frame1,font = ("Courier 20 bold roman"),textvariable = self.a)e1.pack(padx=20,pady = 5)#label_2 = Label(frame1,text="第二次输入数字")#label_2.pack()#self.b = IntVar()#self.b.set(0)#e2 = Entry(frame1,font = ("Courier 20 bold roman"),textvariable=self.b)#e2.pack(padx=20,pady = 5)label_3 = Label(frame1,text="运算符号")label_3.pack()self.c = IntVar()self.c.set("")e3 = Entry(frame1,font = ("Courier 20 bold roman"), textvariable = self.c)e3.pack(padx=20,pady = 5)label_4 = Label(frame1,text="运算结果")label_4.pack()self.d = IntVar()self.d.set(0)e4 = Entry(frame1,font = ("Courier 20 bold roman"), textvariable = self.d)e4.pack(padx=20,pady = 5)#算式的左数self.left = 0#算式的右数self.right = 0#在标签中显示值的self.i = 0#实现多位数的self.j = 0#连续多次运算时，保存左数的self.k = 0#连续多次运算#self.l = 0#运算符self.accept_sign = ""def callback1(self,t):if t == "+":self.c.set(t)self.result()self.accept_sign = "+"elif t == "-":self.c.set(t)self.result()self.accept_sign = "-"elif t == "*":self.c.set(t)self.result()self.accept_sign = "*"else:self.c.set(t)self.result()self.accept_sign = "/"if self.k == 0:self.left = self.a.get()else:self.left = self.kself.j = 0#self.l += 1def callback(self,t):if self.j == 0:self.i = tself.a.set(self.i)if self.j == 1:self.i = self.i * 10 + tself.a.set(self.i)if self.j == 2:self.i = self.i * 10 + tself.a.set(self.i)if self.j == 3:self.i = self.i * 10 + tself.a.set(self.i)if self.j == 4:self.i = self.i * 10 + tself.a.set(self.i)if self.j == 5:self.i = self.i * 10 + tself.a.set(self.i)if self.j == 6:self.i = self.i * 10 + tself.a.set(self.i)if self.j == 7:self.i = self.i * 10 + tself.a.set(self.i)if self.j == 8:self.i = self.i * 10 + tself.a.set(self.i)self.j += 1def result(self):self.right = self.a.get()if self.accept_sign == "+":self.d.set(self.left + self.right)if self.accept_sign == "-":self.d.set(self.left - self.right)if self.accept_sign == "*":self.d.set(self.left * self.right)if self.accept_sign == "/":self.d.set(float(self.left) / self.right)else:passself.k = self.d.get()self.j = 0#self.l = 0def clear(self):self.accept_sign = ""self.a.set(0)self.c.set("")self.d.set(0)self.j = 0self.k = 0self.left = 0self.right = 0#self.l = 0App(root)root.mainloop() 转载请注明蓝盾在线下载http://www.huan-mei.com
