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This might do it:

import glob
import zlib
import sys

for filename in sys.argv:
    with open(filename, 'r') as compressed:
        with open(filename + '-decompressed', 'w') as expanded:
            data = zlib.decompress(compressed.read())
            expanded.write(data)

Then run it like this:

$ python expander.py data/*

This might do it:

import glob
import zlib
import sys

for filename in sys.argv:
    with open(filename, 'rb') as compressed:
        with open(filename + '-decompressed', 'wb') as expanded:
            data = zlib.decompress(compressed.read())
            expanded.write(data)

Then run it like this:

$ python expander.py data/*

This might do it:

import glob
import zlib
import sys

for filename in sys.argv:
    with open(filename, 'r') as compressed:
        with open(filename + '-decompressed', 'w') as expanded:
            data = zlib.decompress(compressed.read())
            expanded.write(data)

Then run it like so:

$ python expander.py data/*

This might do it:

import glob
import zlib
import sys

for filename in sys.argv:
    with open(filename, 'r') as compressed:
        with open(filename + '-decompressed', 'w') as expanded:
            data = zlib.decompress(compressed.read())
            expanded.write(data)

Then run it like this:

$ python expander.py data/*

This might do it:

import glob
import zlib
import sys

for filename in sys.argv:
    with open(filename, 'r') as compressed:
        with open(filename + "-decompressed', 'w') as expanded:
        data = zlib.decompress(compressed.read())
        expanded.write(data)

$ python expander.py data/*

This might do it:

import glob
import zlib
import sys

for filename in sys.argv:
    with open(filename, 'r') as compressed:
        with open(filename + '-decompressed', 'w') as expanded:
            data = zlib.decompress(compressed.read())
            expanded.write(data)

Then run it like so:

$ python expander.py data/*