Don't you just love writing this sort of thing :)

[Lawrence D'Oliveiro]

for \
        Entry \
    in \
        sorted \
          (
            f for f in os.listdir(PatchesDir) if PatchDatePat.search(f) != None
          ) \
:
    Patch = (open, 
gzip.GzipFile)[Entry.endswith(".gz")](os.path.join(PatchesDir, Entry), "r")
    ... read from Patch ...
    Patch.close()
#end for

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