from Tkinter import*
from tkFileDialog import askopenfilename

def start():
      url = 'http://www.google.com/'
      f = open('test.txt', 'w+')
      site = urllib.urlopen(url).read()
      f.write(site)

def open_file():
    askopenfilename(filetypes=[("Text", ".txt")])

root = Tk()
root ['bd'] = 5
root.title(u'Парсер')
main_frame = Frame(root)
url_label = Label(root, text = u'Введите урл странички').pack()
entry_area = Entry(root, width = 23).pack()
button = Button(root, width = 20, text = u'Файл для записи', command = open_file).pack()
button_start = Button(root, width = 20, text = u'Старт', command = start).pack()
root.mainloop()

# -*- coding: utf-8 -*-
from Tkinter import*
from tkFileDialog import askopenfilename
import urllib

def start():
	url = entry_area.get()
	f = open(file_name, 'w+')
	site = urllib.urlopen(url).read()
	f.write(site)
	f.close()

def open_file():
	global file_name
	file_name = askopenfilename(filetypes=[("Text", ".txt")])

root = Tk()
#root ['bd'] = 5
root.title(u'Парсер')
#main_frame = Frame(root)
Label(root, text = u'Введите урл странички').pack()
entry_area = Entry(root, width = 23)
entry_area.pack()
entry_area.insert(0, 'http://www.google.com/')# по умолчанию
Button(root, width = 20, text = u'Файл для записи', command = open_file).pack()
Button(root, width = 20, text = u'Старт', command = start).pack()
file_name = 'test.txt'# по умолчанию
root.mainloop()