'Real' global (write var to different namespace)

Frank Sonnenburg sonnenbu at informatik.uni-bonn.de
Wed Sep 18 10:09:02 EDT 2002

"Maarten van Hulsentop" <maarten at tccn.info> schrieb im Newsbeitrag
news:29242dfa.0209180310.94c915d at posting.google.com...
> Hi y'all
> I'm sorry if it's a FAQ but i honestly can't find to solution to my
> problem; i've created a 'store' (a class) to store vars using the
> (really cool) pickle classes. Now i can store a var doing:
> "mystore['varname'] = myvar" and read it again by "myvar =
> mystore['varname']". My question is if it's possible to create a
> function like 'mystore.RestoreVars()' that sets ALL the stored vars in
> the _calling_ namespace at once.
> Hope it's clear enough, i'm still a python newbie so excuse me if i
> used the wrong terms or if i didn't explain it enough.
> Thanks
> Maarten van Hulsentop

Maybe you will use this class prototype:


class store:
  "Storage class for arbitrary data"

  def writeto(self, obj):
    "Make contents of storage instance visible in obj"



You have to pass the calling namespace explicitly, maybe you will see this
as a disadvantage, but it fits to python philosophy: explicit is better than



1 - Instantiating of storage

>>> st = store()
>>> st.storage_var = 42

2 - Make visible in main scope

>>> import sys
>>> st.writeto(sys.modules['__main__'])
>>> dir()
['__builtins__', '__doc__', '__name__', 'st', 'storage_var', 'store', 'sys']
>>> storage_var

3 - Make visible in some object

>>> class c:
...     pass
>>> o = c()
>>> st.writeto(o)
>>> dir(o)
>>> o.storage_var

4 - Usage in instance method

>>> class cc:
...     def f(self):
...             st.writeto(self)
>>> oo = cc()
>>> oo.f()
>>> oo.storage_var


Hope it is nearly what you desired -- Frank

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