Is it possible to write a firewall in python?

Question

Is it possible to write a firewall in python? Say it would block all traffic?

Answer 1

Python-iptables provides python bindings to iptables under Linux. Interoperability with iptables is achieved via using the iptables C libraries (libiptc, libxtables, and the iptables extensions), not calling the iptables binary and parsing its output.

http://ldx.github.io/python-iptables/index.html