Hi python-list,

I'm embedding Python in an application and I have encountered two crashes while 
calling built-in functions that expect a top-level frame. See the following bug 
reports: http://bugs.python.org/issue21563 and 
http://bugs.python.org/issue21418. The problem is that the workflow for 
embedding the Python interpreter does not involve creation of a frame. 
RubyPython, a language interface to call Python from Ruby, has the same 
problem, http://rubypython.rubyforge.org/#known-problems. Since there is not a 
top-level frame object, some built-in functions do not work properly. In most 
cases, this problem is easily worked-around because globals and locals can be 
passed as optional arguments. The crashes, however, are more unfortunate. 

As an example, I can crash RubyPython by calling the built-in function execfile 
with a single argument.

irb(main):001:0> require('rubypython')
warning: undefining `object_id' may cause serious problems
=> true
irb(main):002:0> RubyPython.start
=> true
irb(main):003:0> binmod = RubyPython.import('__builtin__')
=> <module '__builtin__' (built-in)>
irb(main):004:0> binmod.execfile('foo.py')

The fourth line crashed the ruby interpreter. This is an example where an 
application might want to give full access to the functions in a Python module. 
It would be nice to find a way to prevent the crash without restricting the API.

I am curious if anyone has suggestions for creating a top-level frame?

Thank you,


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