Using better approach for skipping test if Cython no pres.

IPython/extensions/tests/test_cythonmagic.py

@@ -1,45 +1,45
 # -*- coding: utf-8 -*-
 """Tests for the Cython magics extension."""
 
 import os
 import nose.tools as nt
 
 
 code = """def f(x):
     return 2*x
 """
 
 try:
     import Cython
 except:
-    pass
-else:
+    __test__ = False
+
     def setup():
         ip = get_ipython()
         ip.extension_manager.load_extension('cythonmagic')
 
     def test_cython_inline():
         ip = get_ipython()
         ip.ex('a=10; b=20')
         result = ip.run_cell_magic('cython_inline','','return a+b')
         nt.assert_equals(result, 30)
 
     def test_cython_pyximport():
         module_name = '_test_cython_pyximport'
         ip = get_ipython()
         ip.run_cell_magic('cython_pyximport', module_name, code)
         ip.ex('g = f(10)')
         nt.assert_equals(ip.user_ns['g'], 20.0)
         try:
             os.remove(module_name+'.pyx')
         except OSError:
             pass
 
     def test_cython():
         ip = get_ipython()
         ip.run_cell_magic('cython', '', code)
         ip.ex('g = f(10)')
         nt.assert_equals(ip.user_ns['g'], 20.0)