Reddit API News Program

import praw
import tkinter as tk
from tkinter import *
refreshN = 0

def refresh():
    global refreshN
    text=[]
    refreshN += 1
    r = praw.Reddit(user_agent="windows:RedditNews_test:v1")
    headlines = r.get_subreddit('askreddit').get_new(limit=10)
    text = [str(x) for x in headlines]
    canvas.create_rectangle(0,0,500,300,fill='#f2f2f2',outline='#f2f2f2')
    for a in range(0,10):
        canvas.create_text(15,a*30+15,text=str(a+1)+("."))
        canvas.create_text(250,a*30+15,text=text[a])
    print("Refreshed #"+str(refreshN))

root = tk.Tk()
root.title("Reddit News")
canvas = Canvas(root,width=500,height=330)
canvas.grid()
canvas.focus_set()

btnRefresh = Button(root,command = refresh, text='Refresh')
canvas.create_window(200, 300, width=100,height=28,anchor=NW, window=btnRefresh)

refresh()

root.mainloop()