Hello everyone,
I want to build a web interface to a database that I am populating with
python and sqlalchemy.
I am running windows 8, not windows 8.1 and python 3.4. I have used the
pytho.org installer for python.
after installing tg.devtools, generating the quickstart project and
installing it as specified in the tutorial and running "gearbox serve
--reload --debug" I get an exception when i try to load the root URL /.
The exception page starts with:
builtins.Exception
Exception: Unhandled node type <class '_ast.NameConstant'>
and then it has a massive traceback. It may not be a problem with
turbogears but i don't know where else to start.
it appears to throw the exception in "genshi"
I know I probably haven't supplied information, but I am hoping someone has
run into this. Here is the full exception traceback:
builtins.Exception
Exception: Unhandled node type <class '_ast.NameConstant'>
Traceback *(most recent call last)*
- File "D:\Python34\lib\site-packages\tg\wsgiapp.py", line *122*, in
__call__
response = self.wrapped_dispatch(controller, environ, context)
- File "D:\Python34\lib\site-packages\tg\appwrappers\errorpage.py", line
*56*, in __call__
resp = self.next_handler(controller, environ, context)
- File
"D:\Python34\lib\site-packages\tg\appwrappers\transaction_manager.py",
line *107*, in __call__
reraise(*exc_info)
- File "D:\Python34\lib\site-packages\tg\_compat.py", line *81*, in
reraise
raise value
- File
"D:\Python34\lib\site-packages\tg\appwrappers\transaction_manager.py",
line *83*, in __call__
response = self.next_handler(controller, environ, context)
- File "D:\Python34\lib\site-packages\tg\appwrappers\caching.py", line
*54*, in __call__
return self.next_handler(controller, environ, context)
- File "D:\Python34\lib\site-packages\tg\appwrappers\session.py", line
*71*, in __call__
response = self.next_handler(controller, environ, context)
- File "D:\Python34\lib\site-packages\tg\appwrappers\identity.py", line
*47*, in __call__
return self.next_handler(controller, environ, context)
- File "D:\Python34\lib\site-packages\tg\appwrappers\i18n.py", line *71*,
in __call__
return self.next_handler(controller, environ, context)
- File "D:\Python34\lib\site-packages\tg\wsgiapp.py", line *295*, in
dispatch
return controller(environ, context)
- File "d:\current2\python\tg\dict\dict\lib\base.py", line *27*, in
__call__
return TGController.__call__(self, environ, context)
- File "D:\Python34\lib\site-packages\tg\controllers\dispatcher.py",
line *128*, in __call__
response = self._perform_call(context)
- File "D:\Python34\lib\site-packages\tg\controllers\dispatcher.py",
line *109*, in _perform_call
r = self._call(func, params, remainder=remainder, context=context)
- File
"D:\Python34\lib\site-packages\tg\controllers\decoratedcontroller.py",
line *127*, in _call
response = self._render_response(context, controller, output)
- File
"D:\Python34\lib\site-packages\tg\controllers\decoratedcontroller.py",
line *237*, in _render_response
template_name=template_name, **render_params)
- File "D:\Python34\lib\site-packages\tg\render.py", line *212*, in
render
kwargs['result'] = render_function(template_name, tg_vars, **kwargs)
- File "D:\Python34\lib\site-packages\tg\renderers\genshi.py", line *212*,
in __call__
ns_options=('doctype', 'method'), **kwargs)
- File "D:\Python34\lib\site-packages\tg\render.py", line *278*, in
cached_template
return render_func()
- File "D:\Python34\lib\site-packages\tg\renderers\genshi.py", line *208*,
in render_template
encoding=None)
- File "D:\Python34\lib\site-packages\genshi\core.py", line *184*, in
render
return encode(generator, method=method, encoding=encoding, out=out)
- File "D:\Python34\lib\site-packages\genshi\output.py", line *57*, in
encode
return _encode(''.join(list(iterator)))
- File "D:\Python34\lib\site-packages\genshi\output.py", line *350*, in
__call__
for kind, data, pos in stream:
- File "D:\Python34\lib\site-packages\genshi\output.py", line *829*, in
__call__
for kind, data, pos in stream:
- File "D:\Python34\lib\site-packages\genshi\output.py", line *669*, in
__call__
for kind, data, pos in stream:
- File "D:\Python34\lib\site-packages\genshi\output.py", line *774*, in
__call__
for kind, data, pos in chain(stream, [(None, None, None)]):
- File "D:\Python34\lib\site-packages\genshi\output.py", line *594*, in
__call__
for ev in stream:
- File "D:\Python34\lib\site-packages\genshi\core.py", line *289*, in
_ensure
for event in stream:
- File "D:\Python34\lib\site-packages\genshi\template\base.py", line
*630*, in _include
for event in tmpl.generate(ctxt, **vars):
- File "D:\Python34\lib\site-packages\genshi\template\base.py", line
*544*, in generate
stream = self.stream
- File "D:\Python34\lib\site-packages\genshi\template\base.py", line
*454*, in stream
self._stream = list(self._prepare(self._stream))
- File "D:\Python34\lib\site-packages\genshi\template\base.py", line
*490*, in _prepare
yield kind, (directives, list(substream)), pos
- File "D:\Python34\lib\site-packages\genshi\template\base.py", line
*490*, in _prepare
yield kind, (directives, list(substream)), pos
- File "D:\Python34\lib\site-packages\genshi\template\base.py", line
*485*, in _prepare
namespaces, pos)
- File "D:\Python34\lib\site-packages\genshi\template\directives.py",
line *397*, in attach
namespaces, pos)
- File "D:\Python34\lib\site-packages\genshi\template\directives.py",
line *82*, in attach
return cls(value, template, namespaces, *pos[1:]), stream
- File "D:\Python34\lib\site-packages\genshi\template\directives.py",
line *60*, in __init__
self.expr = self._parse_expr(value, template, lineno, offset)
- File "D:\Python34\lib\site-packages\genshi\template\directives.py",
line *109*, in _parse_expr
lookup=template.lookup) or None
- File "D:\Python34\lib\site-packages\genshi\template\eval.py", line *93*,
in __init__
filename=filename, lineno=lineno, xform=xform)
- File "D:\Python34\lib\site-packages\genshi\template\eval.py", line
*463*, in _compile
new_source = ASTCodeGenerator(tree).code
- File "D:\Python34\lib\site-packages\genshi\template\astutil.py", line
*43*, in __init__
self.visit(tree)
- File "D:\Python34\lib\site-packages\genshi\template\astutil.py", line
*91*, in visit
ret = visitor(node)
- File "D:\Python34\lib\site-packages\genshi\template\astutil.py", line
*104*, in visit_Expression
return self.visit(node.body)
- File "D:\Python34\lib\site-packages\genshi\template\astutil.py", line
*90*, in visit
raise Exception('Unhandled node type %r' % type(node))
Exception: Unhandled node type <class '_ast.NameConstant'>
The debugger caught an exception in your WSGI application. You can now look
at the traceback which led to the error.
To switch between the interactive traceback and the plaintext one, you can
click on the "Traceback" headline. From the text traceback you can also
create a paste of it. For code execution mouse-over the frame you want to
debug and click on the console icon on the right side.
You can execute arbitrary Python code in the stack frames and there are
some extra helpers available for introspection:
- dump() shows all variables in the frame
- dump(obj) dumps all that's known about the object
- ctx the context of the failed request
*Backlash*, using the Werkzeug Debugger.
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