fetch.py: improve readability of extract_urls

fetch.py

@@ -107,7 +107,11 @@ def extract_urls(content, urls = None, urignore=None):
 	soup = soupify(content)
 	for a in soup.body.find_all('a'):
 		if not 'rel' in a.attrs or not 'noreferrer' in a.attrs['rel'] or a.attrs['href'] in urls: continue
-		badurl = [ i for i in urignore if re.findall(i,a.attrs['href'], re.IGNORECASE) ]
-		if not len(badurl): urls.append(a.attrs['href'])
+		bad = False
+		for i in urignore:
+			if re.findall(i,a.attrs['href'], re.IGNORECASE):
+				bad = True
+				break
+		if not bad: urls.append(a.attrs['href'])
 	return urls