On Fri, Feb 14, 2003 at 11:13:25AM +0000, Michael Hudson wrote:
> I know Guido's squashed the idea, but how would you issue a warning on
> use of a module level global?
You could arrange to have a subclass of module that warns in
__getattribute__:
>>> os1 = reload(mwd).ModuleWithDeprecations('os', os, ['sep'])
<module '?' (built-in)> {}
>>> os1.path
<module 'posixpath' from '/usr/lib/python2.2/posixpath.pyc'>
>>> os1.sep
__main__:1: DeprecationWarning: os.sep is deprecated
'/'
>>> os1.__deprecated__
{'sep': '/'}
>>> 'sep' in dir(os1)
0
If ModuleWithDeprecations was coded in C, the performance impact (which
would only occur on AttributeErrors) would probably be small, and no
more than one test+branch for modules with nothing __deprecated__.
import types
import warnings
class ModuleWithDeprecations(types.ModuleType):
def __init__(self, name, module, deprecated):
types.ModuleType.__init__(self, name)
print self, self.__dict__
self.__dict__.update(module.__dict__)
self.__deprecated__ = {}
for item in deprecated:
self.__deprecated__[item] = self.__dict__[item]
del self.__dict__[item]
def __getattribute__(self, attr):
try:
return types.ModuleType.__getattribute__(self, attr)
except AttributeError:
if attr in self.__deprecated__:
warnings.warn("%s.%s is deprecated" % (self.__name__, attr),
DeprecationWarning, 2)
return self.__deprecated__[attr]
else:
raise
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