Simple tool to prevent me needing to remember bit to range conversions. accepts single param of cidr in 10.0.0.0/32 format

cidr.py

#!/usr/bin/env python3

import sys
import ipaddress

CYAN = '\033[96m'
END  = '\033[0m'
BOLD = '\033[1m'

if len(sys.argv) < 2:
    raise ValueError('No CIDR was provided on the command line.')
elif len(sys.argv) > 2:
    raise ValueError('Only one CIDR supported')

network = ipaddress.IPv4Network(sys.argv[1])

def head(str_heading):
    return emph(str_heading) + " " + END

def text(str_text):
    return BOLD + emph(str_text)

def emph(str_emph):
    return CYAN + str(str_emph) + END

cidr = head("Cidr: ") + text(network.network_address) + emph("/") + text(network.prefixlen)
private = head("Private:") +  text(network.is_private)
range = head("Range:") + text(network[0]) + emph("-") + text(network[-1])
lines = [
    cidr + " " + private, 
    range
]
for line in lines:
    print(line)