commit 8f7fba15146bb87bc1313fa5d5375669d5fefe16
Author: Bradley M. Froehle <brad.froehle@gmail.com>
Date:   Fri Apr 12 12:23:06 2013 -0700

    Remove unnecessary import.  (Fixes Python 3.3 reference problem.)
    
    The import sys line is unnecessary because we have already imported
    it at the global scope earlier in the file. This prevents a very
    strange reference leak which I do not quite understand. The leak
    manifests itself in Python 3.3 as a failing test (test_attrs_data.py:
    TestTypes.test_complex).
    
    The bug was tracked down by turning on `gc.set_debug(gc.DEBUG_LEAK)`
    and noticing an entry in `gc.garbage`::
    
       ImportError("No module named 'h5py.sys'",)
    
    Certainly this should not have caused an import error, so it is
    potentially a bug in Cython. More investigation will be required.
    
    Closes #275.

diff --git a/h5py/h5t.pyx b/h5py/h5t.pyx
index b798995..ef89ceb 100644
--- a/h5py/h5t.pyx
+++ b/h5py/h5t.pyx
@@ -997,8 +997,6 @@ cdef class TypeCompoundID(TypeCompositeID):
         field_types = []
         nfields = self.get_nmembers()
 
-        import sys
-
         # First step: read field names and their Numpy dtypes into 
         # two separate arrays.
         for i from 0 <= i < nfields: