初学者实现计算器功能，初学者实现计算器,没有使用任何模块，仅仅使

初学者实现计算器功能，初学者实现计算器,没有使用任何模块，仅仅使

没有使用任何模块，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。适合初学者一起学习python基础。

#! /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.k        self.j = 0        #self.l += 1    def callback(self,t):        if self.j == 0:            self.i = t            self.a.set(self.i)        if self.j == 1:            self.i = self.i * 10 + t            self.a.set(self.i)        if self.j == 2:            self.i = self.i * 10 + t            self.a.set(self.i)        if self.j == 3:            self.i = self.i * 10 + t            self.a.set(self.i)        if self.j == 4:            self.i = self.i * 10 + t            self.a.set(self.i)        if self.j == 5:            self.i = self.i * 10 + t            self.a.set(self.i)        if self.j == 6:            self.i = self.i * 10 + t            self.a.set(self.i)        if self.j == 7:            self.i = self.i * 10 + t            self.a.set(self.i)        if self.j == 8:            self.i = self.i * 10 + t            self.a.set(self.i)        self.j += 1    def 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:            pass        self.k = self.d.get()        self.j = 0        #self.l = 0    def clear(self):        self.accept_sign = ""        self.a.set(0)        self.c.set("")        self.d.set(0)        self.j = 0        self.k = 0        self.left = 0        self.right = 0        #self.l = 0App(root)root.mainloop()#该片段来自于http://byrx.net