MAINT: remove unused system tool gunzip

Author: bsipocz

astroquery/utils/system_tools.py

@@ -1,33 +1,6 @@
 # Licensed under a 3-clause BSD style license - see LICENSE.rst
 
-import gzip
 import os
-import shutil
-
-
-def gunzip(filename):
-    """ Decompress a file with gzip.
-
-    Parameters
-    ----------
-    filename : str
-        Fully qualified path of the file to decompress.
-
-    Returns
-    -------
-    filename : str
-        Name of the decompressed file (or input filename if gzip is not
-        available).
-    """
-
-    # ".fz" denotes RICE rather than gzip compression
-    if not filename.endswith('.fz'):
-        with gzip.open(filename, 'rb') as f_in:
-            with open(filename.rsplit(".", 1)[0], 'wb') as f_out:
-                shutil.copyfileobj(f_in, f_out)
-        return filename.rsplit(".", 1)[0]
-    else:
-        return filename
 
 
 # If there is an update issue of astropy#2793 that got merged, this should