iterate lines with regex

[MRAB]

Robert Kern wrote:
[snip]
> 
> for line in readThis:
>     key_match = key.search(line)
>     if key_match is not None:
>         this_key = key_match.group(1)
>         # ... do something with this_key
>     map_match = map.search(line)
>     if map_match is not None:
>         this_map = map_match.group(1)
>         # ... do something with this_map
>     parcel_match = parcel.search(line)
>     if parcel_match is not None:
>         this_parcel = parcel_match.group(1)
>         # ... do something with this_parcel
> 
re.search and re.match will return a MatchObject if successful or None
if unsuccessful. A MatchObject is always true, so you can simplify to:

     ...
     if key_match:
         this_key = key_match.group(1)
         # ... do something with this_key
     ...