Scipy breaks object deletion when imported from a method

[stephaned]

Hi,

With the following code:

class App:
    def __init__(self):
        import scipy
        ##scipy.pkgload.parent_frame = None

    def __del__(self):
        print "app deleted"

app = App()
print "Deleting app"
del app
print "Leaving Python"

Here is the output:

Deleting app
Leaving Python
app deleted     <-- WRONG

The app object is not deleted by "del app" but when Python leaves.

This is because "app" has a refcount of 2.

Going further, I found that "scipy.pkgload.parent_frame = None" solves the issue.

I also tried to transform "scipy.pkgload.parent_frame" to a "weakref.proxy", but got "cannot create weak reference to 'frame' object".

Cheers. Stephane