On Jun 16, 4:43 am, John Nagle <na...@animats.com> wrote:
> Is it possible to override "__setattr__" of a module? I
> want to capture changes to global variables for debug purposes.
>
> None of the following seem to have any effect.
>
> modu.__setattr__ = myfn
>
> setattr(modu, "__setattr__", myfn)
>
> delattr(modu, "__setattr__")
>
> John Nagle
There is a dirty trick which involves fiddling with sys.modules.
For instance:
$ cat x.py
import sys
class FakeModule(object):
def __init__(self, dic):
vars(self).update(dic)
def __setattr__(self, name, value):
print "setting %s=%s" % (name, value)
object.__setattr__(self, name, value)
a = 1
def f():
print 'called f'
sys.modules[__name__] = FakeModule(globals())
Here is an ipython session:
In [1]: import x
In [2]: x.a
Out[2]: 1
In [3]: x.f
Out[3]: <function f at 0x93f5614>
In [4]: x.f()
called f
In [5]: x.a=2
setting a=2
In [6]: x.a
Out[6]: 2
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