Remove jython code, remove all jython / pypy symbols

Removed all dialect code related to support for Jython and zxJDBC. Jython
has not been supported by SQLAlchemy for many years and it is not expected
that the current zxJDBC code is at all functional; for the moment it just
takes up space and adds confusion by showing up in documentation. At the
moment, it appears that Jython has achieved Python 2.7 support in its
releases but not Python 3.   If Jython were to be supported again, the form
it should take is against the Python 3 version of Jython, and the various
zxJDBC stubs for various backends should be implemented as a third party
dialect.

Additionally modernized logic that distinguishes between "cpython"
and "pypy" to instead look at platform.python_distribution() which
reliably tells us if we are cPython or not; all booleans which
previously checked for pypy and sometimes jython are now converted
to be "not cpython", this impacts the test suite for tests that are
cPython centric.

Fixes: #5094
Change-Id: I226cb55827f997daf6b4f4a755c18e7f4eb8d9ad

1 files changed, 4 insertions, 18 deletions

diff --git a/lib/sqlalchemy/testing/util.py b/lib/sqlalchemy/testing/util.py
index de20bb794..c52dc4a19 100644
--- a/lib/sqlalchemy/testing/util.py
+++ b/lib/sqlalchemy/testing/util.py
@@ -9,36 +9,22 @@ import decimal
 import gc
 import random
 import sys
-import time
 import types
 
 from . import mock
 from ..util import decorator
 from ..util import defaultdict
+from ..util import has_refcount_gc
 from ..util import inspect_getfullargspec
-from ..util import jython
 from ..util import py2k
-from ..util import pypy
 
-if jython:
+if not has_refcount_gc:
 
-    def jython_gc_collect(*args):
-        """aggressive gc.collect for tests."""
-        gc.collect()
-        time.sleep(0.1)
-        gc.collect()
-        gc.collect()
-        return 0
-
-    # "lazy" gc, for VM's that don't GC on refcount == 0
-    gc_collect = lazy_gc = jython_gc_collect
-elif pypy:
-
-    def pypy_gc_collect(*args):
+    def non_refcount_gc_collect(*args):
         gc.collect()
         gc.collect()
 
-    gc_collect = lazy_gc = pypy_gc_collect
+    gc_collect = lazy_gc = non_refcount_gc_collect
 else:
     # assume CPython - straight gc.collect, lazy_gc() is a pass
     gc_collect = gc.collect