python3 printHeaders.py

#!/usr/bin/python3

import os

d = os.environ
k = d.keys()
#k.sort()

print ("Content-type: text/html\n\n")

print ("<HTML><HEAD><TITLE>printHeaders.cgi</TITLE></Head><BODY>")
print ("<h1>Environment Variables</H1>")
for item in k:
    print ("<p><B>%s</B>: %s </p>" % (item, d[item]))
print ("</BODY></HTML>")