Convert from ipv4 a.b.c.d to ipv6 abcd:abcd

to_ipv6.py

###############################################################################
# to_ipv6.py                                                                    
#                                                                               
# Author: electronut.in                                                         
#                                                                               
# Description:                                                                  
#                                                                               
# Convert from ipv4 to ipv6                                                      
# eg:                                                                           
#                                                                               
# python to_ipv6.py 185.199.108.153                                             
#                                                                               
# b9c7:6c99                                                                     
#                                                                               
###############################################################################

import sys

def to_ipv6(a):
    b = "".join([format(int(x), '02x') for x in a.split(".")])
    return b[0:4] + ":" + b[4:]

# main() function                                                               
def main():
  # use sys.argv if needed                                                      
  if len(sys.argv) != 2:
      print("usage: python to_ipv6.py a.b.c.d")
  else:
      print(to_ipv6(sys.argv[1]))

# call main                                                                     
if __name__ == '__main__':
  main()