... a simple POSIX /bin/sh script may be more simple solution then 15000 bytes python script ...

#! /bin/sh

rm -f hosts.[0-9]*

cat << __EOF | while read LIST; do COUNT=$(( ${COUNT} + 1 )); echo "curl -g \"${LIST}\" | sed -e s/$'\r'//g 1> hosts.${COUNT}"; done | parallel
http://adaway.org/hosts.txt
http://netcologne.dl.sourceforge.net/project/adzhosts/FORADAWAY.txt
http://pgl.yoyo.org/adservers/serverlist.php?hostformat=hosts&mimetype=plaintext
http://someonewhocares.org/hosts/hosts
http://winhelp2002.mvps.org/hosts.txt
http://www.malwaredomainlist.com/hostslist/hosts.txt
https://raw.githubusercontent.com/StevenBlack/hosts/master/data/StevenBlack/hosts
__EOF

cat hosts.[0-9]* \
  | grep -v '^#' \
  | grep -v '^$' \
  | awk '{print $2}' \
  | sort -u -f \
  | while read I
    do
      echo 0.0.0.0 ${I}
    done | sed 1d 1> hosts

This one fetches all hosts sources in parallel and then merges them into a single 0.0.0.0 hosts file.

Regards, vermaden

[Rergis]

Suckless Philosophy in action! man i love this script!

[StevenBlack]

Closing.