Fix deprecations

Author: dstansby

numcodecs/blosc.pyx

@@ -100,7 +100,10 @@ def _init():
     """Initialize the Blosc library environment."""
     blosc_init()
 
-init = deprecated("init is deprecated, with no replacement")(_init)
+
+@deprecated("init is deprecated, with no replacement")
+def init():
+    return _init()
 
 
 def _destroy():
@@ -119,7 +122,10 @@ def _compname_to_compcode(cname):
         cname = cname.encode('ascii')
     return blosc_compname_to_compcode(cname)
 
-compname_to_compcode = deprecated("compname_to_compcode is deprecated, with no replacement")(_compname_to_compcode)
+
+@deprecated("compname_to_compcode is deprecated, with no replacement")
+def compname_to_compcode(cname):
+    return _compname_to_compcode(cname)
 
 
 def list_compressors():
@@ -168,7 +174,9 @@ def _cbuffer_sizes(source):
 
     return nbytes, cbytes, blocksize
 
-cbuffer_sizes = deprecated(_cbuffer_sizes)
+@deprecated("cbuffer_sizes is deprecated with no replacement")
+def cbuffer_sizes(source):
+    return _cbuffer_sizes(source)
 
 def cbuffer_complib(source):
     """Return the name of the compression library used to compress `source`."""
@@ -226,13 +234,21 @@ def _cbuffer_metainfo(source):
 
     return typesize, shuffle, memcpyed
 
-cbuffer_metainfo = deprecated("cbuffer_metainfo is deprecated, with no replacement")(_cbuffer_metainfo)
+
+@deprecated("cbuffer_metainfo is deprecated, with no replacement")
+def cbuffer_metainfo(source):
+    return _cbuffer_metainfo(source)
+
 
 def _err_bad_cname(cname):
     raise ValueError('bad compressor or compressor not supported: %r; expected one of '
                      '%s' % (cname, list_compressors()))
 
-err_bad_cname = deprecated("err_bad_cname is deprecated, with no replacement")(_err_bad_cname)
+
+@deprecated("err_bad_cname is deprecated, with no replacement")
+def err_bad_cname(cname):
+    return _err_bad_cname(cname)
+
 
 def compress(source, char* cname, int clevel, int shuffle=SHUFFLE,
              int blocksize=AUTOBLOCKS):
@@ -489,7 +505,9 @@ def _decompress_partial(source, start, nitems, dest=None):
 
     return dest
 
-decompress_partial = deprecated("decompress_partial is deprecated, with no replacement")(_decompress_partial)
+@deprecated("decompress_partial is deprecated, with no replacement")
+def decompress_partial(source, start, nitems, dest=None):
+    return _decompress_partial(source, start, nitems, dest=None)
 
 # set the value of this variable to True or False to override the
 # default adaptive behaviour