Missing documentation

[JeremieIntel]

I'm trying to run Hyperscan in python but there is absolutely no documentation on how to run it.
I'm missing an "hello world" example on how to use it.
What i have is:

pattern ="He"
match_found = []
db = hyperscan.Database()
       db.compile(
           expressions=[pattern.encode('utf-8')],
           flags=hyperscan.HS_FLAG_CASELESS
       )
 def on_match(id, from_, to, flags, context):
           context.append(True)
           return True
if db.scan("hello world!".encode(utf-8), on_match, context=match_found)
  print"match found")

but it doesn't work because db.scan() returns None