getLinks

from tkinter import *
from tkinter.simpledialog import askstring
import tkinter.filedialog, urllib.request, urllib.error, sys, re

def getUrl():
    urltoopen = askstring('Address', 'Enter A Site')
    urltoopen.strip()
    if not urltoopen.lower().startswith("http://"):
        urltoopen = "http://" + urltoopen
    return urltoopen

def readPage(urltoopen):
    try:
        html = urllib.request.urlopen(urltoopen).read().decode('utf-8')
        body = re.findall(r'<body.*?>(.*?)</body>', html, re.DOTALL)
    except urllib.error.URLError as e:
        print("Error accessing URL",e.reason)
        sys.exit(0)
    return body

def getLinks(body):
    newList = []
    final = set()
    links = re.findall(r'<a.*?(.*?)</a>',body[0], re.DOTALL)
    href = re.findall(r'href="(.*?)"',"".join(links), re.DOTALL)
    for httpLinks in href:
        newList.append(re.findall(r'http.*',httpLinks, re.DOTALL))
    for a in newList:
        if a != list():
            final.add(a[0])
    return final

def writetofile(saveToFile, links):
    for a in links:
        saveToFile.write(a)
        saveToFile.write('\n')

def run():
    root = Tk()
    root.withdraw()
    site = getUrl()
    body = readPage(site)
    links = getLinks(body)
    saveToFile = tkinter.filedialog.asksaveasfile()
    writetofile(saveToFile, links)
    saveToFile.close()

if __name__ == "__main__":
    run()