tkinter计算字符串的值 分类： python 小练习 python 2013-06-30 17:11 299人阅读 评论(0) 收藏

from Tkinter import *

class App:

    def __init__(self,root):

        frame = Frame(root)
        frame.pack()
        self.frame = frame

        w = Label(frame,text = "calculator")
        w.pack()

        self.newinput()

        button1 = Button(frame,text='1',fg="red",command = lambda : self.buttoncb(1))
        button1.pack()

        button2 = Button(frame,text='2',fg="red",command = lambda : self.buttoncb(2))
        button2.pack()

        button3 = Button(frame,text='+',fg="red",command = lambda : self.buttoncb("+"))
        button3.pack()

        button4 = Button(frame,text='=',fg="red",command = lambda : self.cal())
        button4.pack()

        button = Button(frame,text='Quit',fg="red",command = root.quit)
        button.pack()

     def newinput(self):

        v = StringVar()
        e = Entry(self.frame,textvariable = v)
        self.v = v
        e.pack()

    def buttoncb(self,i):
        val = self.v.get()
        self.v.set(val+str(i))

    def cal(self):
        v = self.v.get()

        self.v.set(eval(v))


root = Tk()
a = App(root)
root.mainloop()

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