Update RSS feed every 2 minutes

Question

I've searched pretty everywhere so that's why I'm asking here. My program shows a parsed RSS feed (news), that looks like this in the end:

feedShow = feed['entries'][0]['title'] 

Now, this feedShow element is the text displayed later by a Label. The 0 in the code line determines which news title to display. I'd like to change that every 2 minutes to +1. How do I do that? I'd have known in a more basic situation but that's in the middle of the code. As my clock, I use

import time
from datetime import date
from datetime import datetime 

Answer 1

How about something like this. Code will update the self.headlineIndex every X seconds (currently set to 1 second). The headline is grabbed using headline = feed['entries'][self.headlineIndex]['title']. Notice the self.headlineIndex inside the square braces rather than a number like zero.

    try:
    import tkinter as tk
except:
    import Tkinter as tk

"""Some dummy data in the same format as OP"""
feed = {'entries': [{'title':"US Pres. incompetent"},
                    {'title':"Sport happened"},
                    {'title':"Politican Corrupt"}]
        }

class App(tk.Frame):
    def __init__(self,master=None,**kw):
        tk.Frame.__init__(self,master=master,**kw)
        self.txtHeadline = tk.StringVar()
        self.headline = tk.Label(self,textvariable=self.txtHeadline)
        self.headline.grid()

        self.headlineIndex = 0

        self.updateHeadline()

    def updateHeadline(self):
        try:
            headline = feed['entries'][self.headlineIndex]['title']
        except IndexError:
            """This will happen if we go beyond the end of the list of entries"""
            self.headlineIndex = 0
            headline = feed['entries'][self.headlineIndex]['title']

        self.txtHeadline.set(headline)
        self.headlineIndex += 1
        self.after(1000,self.updateHeadline)


if __name__ == '__main__':
    root = tk.Tk()
    App(root).grid()
    root.mainloop()