Use hasattr instead of try/except

--HG--
branch : issue463

_pytest/python.py

@@ -142,13 +142,10 @@ def pytest_cmdline_main(config):
 
 
 def pytest_generate_tests(metafunc):
-    try:
     # this misspelling is common - raise a specific error to alert the user
-        markers = metafunc.function.parameterize
+    if hasattr(metafunc.function, 'parameterize'):
         msg = "{} has mark 'parameterize', spelling should be 'parametrize'"
         raise ValueError(msg.format(metafunc.function.__name__))
-    except AttributeError:
-        pass
     try:
         markers = metafunc.function.parametrize
     except AttributeError: