exec with partial globals

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From	Helmut Jarausch <jarausch@igpm.rwth-aachen.de>
Newsgroups	comp.lang.python
Subject	exec with partial globals
Date	30 Oct 2012 12:00:03 GMT
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Hi,

I'd like to give the user the ability to enter code which may only rebind
a given set of names but not all ones.
This does NOT work
A=1
B=2
Code=compile('A=7','','exec')
exec(Code,{'A':0})
print("I've got A={}".format(A)) # prints 1


How can 'filter' the gobal namespace such that modifying 'A' is allowed
but any attempt to modify 'B' should give an exception.


Many thanks for a hint,
Helmut.

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Thread

exec with partial globals Helmut Jarausch <jarausch@igpm.rwth-aachen.de> - 2012-10-30 12:00 +0000
  Re: exec with partial globals Chris Angelico <rosuav@gmail.com> - 2012-10-30 23:28 +1100
  Re: exec with partial globals Dave Angel <d@davea.name> - 2012-10-30 08:33 -0400
    Re: exec with partial globals Helmut Jarausch <jarausch@igpm.rwth-aachen.de> - 2012-10-30 12:57 +0000
      Re: exec with partial globals Chris Angelico <rosuav@gmail.com> - 2012-10-31 00:18 +1100
      Re: exec with partial globals Dave Angel <d@davea.name> - 2012-10-30 09:39 -0400

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