sequence

Sequence module from awesome cgkit library http://cgkit.sourceforge.net/doc2/sequence.html

Quick example

import sequence
sequences = sequence.glob('pattern or path to directory or partial name')

for seq in sequences:
    ff = str(seq[0]) #Firts frame
    lf = str(seq[-1]) #Last frame
    name, range = seq.sequenceName() #Sequence name and Range object
    path, filename = os.path.split(name) 
    root, ext = os.path.splitext(filename) #get extension and name
    count = len(range) # Frame count - sequence length 
    frames = list(range)
    fframe = str(frames[0]) #Firts frame digit, 1
    lframe = str(frames[-1]) #Last frame digit, 89

And better examples is here http://cgkit.sourceforge.net/doc2/filesequencetools.html