“connect” function

>>> import pyjack
>>>
>>> def fakeimport(orgopen, *args, **kwargs):
...     print 'Trying to import %s' % args[0]
...     return 'MODULE_%s' % args[0]
...
>>> pyjack.connect(__import__, proxyfn=fakeimport)
<..._PyjackFuncBuiltin object at 0x...>
>>>
>>> import time
Trying to import time
>>> print time
MODULE_time
>>>
>>> __import__.restore()
>>>
>>> import time
>>> print time
<module 'time' (built-in)>

“replace_all_refs” function

Setup an ‘item’ reference and put it in a few places:

>>> item = (100, 'one hundred')
>>> data = {item: True, 'itemdata': item}
>>>
>>> class Foobar(object):
...     the_item = item
...
>>> def outer(datum):
...     def inner():
...         return ("Here is the datum:", datum,)
...
...     return inner
...
>>> inner = outer(item)
>>>
>>> print item
(100, 'one hundred')
>>> print data
{'itemdata': (100, 'one hundred'), (100, 'one hundred'): True}
>>> print Foobar.the_item
(100, 'one hundred')
>>> print inner()
('Here is the datum:', (100, 'one hundred'))

Then replace them:

>>> new = (101, 'one hundred and one')
>>> org_item = pyjack.replace_all_refs(item, new)
>>>
>>> print item
(101, 'one hundred and one')
>>> print data
{'itemdata': (101, 'one hundred and one'), (101, 'one hundred and one'): True}
>>> print Foobar.the_item
(101, 'one hundred and one')
>>> print inner()
('Here is the datum:', (101, 'one hundred and one'))

But you still have one final reference to the org data:

>>> print org_item
(100, 'one hundred')

So the process is reversible:

>>> new = pyjack.replace_all_refs(new, org_item)
>>>
>>> print item
(100, 'one hundred')
>>> print data
{'itemdata': (100, 'one hundred'), (100, 'one hundred'): True}
>>> print Foobar.the_item
(100, 'one hundred')
>>> print inner()
('Here is the datum:', (100, 'one hundred'))

Other References

For full documentation and several examples please visit:

• http://packages.python.org/pyjack/

The git repo is here:

• https://github.com/cart0113/pyjack