Remove leading zeros in IP address using Python

Question

Remove unnecessary zeros in IP address:

100.020.003.400  ->  100.20.3.400
001.200.000.004  ->  1.200.0.4
000.002.300.000  ->  0.2.300.0   (optional silly test)

My attempt does not work well in all cases:

import re
ip = re.sub('[.]0+', '.', ip_with_zeroes)

There are similar question but for other languages:

• Perl
• SQL

Please provide solutions for both Python v2 and v3.

Answer 1

Use the netaddr library and then it has the ZEROFILL flag:

import netaddr

ip = "055.023.156.008"

no_zero_ip = netaddr.IPAddress(ip, flags=netaddr.ZEROFILL).ipv4()

# IPAddress('55.23.156.8')

You probably want to change the no_zero_ip result to a string or something else if you don't want the IPAddress type