Template variable reference fails

This is the case where a TAL variable reference using near-tip roundup and python3.5 fails.


I think I have discovered why this happens. In cgi/PageTemplates/PythonExpr.py there is a slight difference between determining variable references in Python 2.7 and Python 3.5. In Python 2.7, assuming function f, evaluating f.func_code.co_names is used to determine variable references. In Python 3.5 the corresponding expression is f.__code__.co_names. On the surface this looks correct. If the function f looks like this:


def f(): return [x for x in context.assignedto_multi if x.realname not in user_realnames]

Note that the variables referenced are context and user_realnames.

The f.func_code.co_names in Python 2.7 evalutates to this:

>>> f.func_code.co_names
('context', 'assignedto_multi', 'realname', 'user_realnames')

The extra names assignedto_multi and realnames aren't really variable but that is OK. The variables context and user_realnames are present. Now, for Python 3.5 the f.__code__.co_names expression evaluates to this:

>>> f.__code__.co_names
('context', 'assignedto_multi')

Note that the required variable user_realnames is not present! This is why I get the following templating error when function f is evaluated:

<class 'NameError'>: name 'user_realnames' is not defined

I looked at all of the other attributes of f.__code__ for Python 3.5 None of them looked like replacements for co_names. The same was the case for the attributes of f.

So, this is a roundup bug due a difference between Python 3.5 and 2.7. Other than filing a bug report I don't know how to proceeded. Any ideas?

Tom Ekberg
Senior Computer Specialist, Lab Medicine
4th Floor, Pat Steel Building
Department of Laboratory Medicine
Work: (206) 520-4856
Email: [email protected]

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