2017.08.16 利用python构建简易图片浏览器

import tkinter as tk,os
class Application(tk.Frame):
    def __init__(self,master=None):
        self.files=os.listdir(r'D:\Picture')
        self.index=0
        self.img=tk.PhotoImage(file=r'D:\Picture'+'\\'+self.files[self.index])
        tk.Frame.__init__(self,master)
        self.pack()
        self.createWidgets()
    def createWidgets(self):
        self.lblImage=tk.Label(self,width=300,height=300)
        self.lblImage['image']=self.img
        self.lblImage.pack()
        self.f=tk.Frame()
        self.f.pack()
        self.btnPrev=tk.Button(self.f,text='上一张',command=self.prev)
        self.btnPrev.pack(side=tk.LEFT)
        self.btnNext=tk.Button(self.f,text='下一张',command=self.next)
        self.btnNext.pack(side=tk.LEFT)
    def prev(self):
        self.showfile(-1)
    def next(self):
        self.showfile(1)
    def showfile(self,n):
        self.index+=n
        if self.index<0:
            self.index=len(self.files)-1
        if self.index>(len(self.files)-1):
            self.index=0
        self.img=tk.PhotoImage(file=r'D:\Picture'+'\\'+self.files[self.index])
        self.lblImage['image']=self.img
        
        
root=tk.Tk()
root.title('简易图片浏览器')
app=Application(master=root)
app.mainloop()