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To: python-list@python.org
From: Robert Snoeberger <robert.snoeberger@icloud.com>
Subject: how to create a frame object when embedding python?
Date: Fri, 23 May 2014 20:52:33 +0000 (GMT)
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Hi python-list,=0A=0AI'm embedding Python in an application and I have enc=
ountered two crashes while calling built-in functions that expect a top-le=
vel frame. See the following bug reports:=A0http://bugs.python.org/issue21=
563=A0and http://bugs.python.org/issue21418.=A0The problem is that the wor=
kflow for embedding the Python interpreter does not involve creation of a =
frame.=A0RubyPython, a language interface to call Python from Ruby, has th=
e same problem,=A0http://rubypython.rubyforge.org/#known-problems. Since t=
here 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 glob=
als and locals can be passed as optional arguments. The crashes, however, =
are more unfortunate.=A0=0A=0AAs an example, I can crash RubyPython by cal=
ling the built-in function execfile with a single argument.=0A=0Airb(main)=
:001:0> require('rubypython')=0AC:/Ruby200-x64/lib/ruby/gems/2.0.0/gems/bl=
ankslate-3.1.2/lib/blankslate.rb:51: warning: undefining `object_id' may c=
ause serious problems=0A=3D> true=0Airb(main):002:0> RubyPython.start=0A=3D=
> true=0Airb(main):003:0> binmod =3D RubyPython.import('__builtin__')=0A=3D=
> <module '__builtin__' (built-in)>=0Airb(main):004:0> binmod.execfile('fo=
o.py')=0A=0AThe fourth line crashed the ruby interpreter. This is an examp=
le 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 with=
out restricting the API.=0A=0AI am curious if anyone has suggestions for c=
reating a top-level frame?=0A=0AThank you,=0ARob =A0=0A=0A=0A=0A=

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<html><body><div>Hi python-list,</div><div><br></div><div>I'm embedding Python in an a=
pplication and I have encountered two crashes while calling built-in funct=
ions that expect a top-level frame. See the following bug reports:&nbsp;<a=
 href=3D"http://bugs.python.org/issue21563.The">http://bugs.python.org/iss=
ue21563</a>&nbsp;and <a href=3D"http://bugs.python.org/issue21418">http://=
bugs.python.org/issue21418</a><span style=3D"line-height: 1.5;">.</span><s=
pan style=3D"line-height: 1.5;">&nbsp;The problem is that the workflow for=
 embedding the Python interpreter does not involve creation of a frame.&nb=
sp;</span><span style=3D"line-height: 1.5;">RubyPython, a language interfa=
ce to call Python from Ruby, has the same problem,&nbsp;</span><a href=3D"=
http://rubypython.rubyforge.org/#known-problems" style=3D"line-height: 1.5=
;">http://rubypython.rubyforge.org/#known-problems</a><span style=3D"line-=
height: 1.5;">. Since there is not a top-level frame object, some built-in=
 functions do not work properly. In most cases, this problem is easily wor=
ked-around because globals and locals can be passed as optional arguments.=
 The crashes, however, are more unfortunate.&nbsp;</span></div><div><span =
style=3D"line-height: 1.5;"><br></span></div><div>As an example, I can cra=
sh RubyPython by calling the built-in function execfile with a single argu=
ment.</div><div><span style=3D"line-height: 1.5;"><br></span></div><div><d=
iv>irb(main):001:0&gt; require('rubypython')</div><div>C:/Ruby200-x64/lib/=
ruby/gems/2.0.0/gems/blankslate-3.1.2/lib/blankslate.rb:51: w<span style=3D=
"line-height: 1.5;">arning: undefining `object_id' may cause serious probl=
ems</span></div><div>=3D&gt; true</div><div>irb(main):002:0&gt; RubyPython=
.start</div><div>=3D&gt; true</div><div>irb(main):003:0&gt; binmod =3D Rub=
yPython.import('__builtin__')</div><div>=3D&gt; &lt;module '__builtin__' (=
built-in)&gt;</div><div style=3D"">irb(main):004:0&gt; binmod.execfile('fo=
o.py')</div></div><div><span style=3D"line-height: 1.5;"><br></span></div>=
<div>The fourth line crashed the ruby interpreter. This is an example wher=
e an application might want to give full access to the functions in a Pyth=
on module. It would be nice to find a way to prevent the crash without res=
tricting the API.</div><div><span style=3D"line-height: 1.5;"><br></span><=
/div><div><span style=3D"line-height: 1.5;">I am curious if anyone has sug=
gestions for creating a top-level frame?</span></div><div><span style=3D"l=
ine-height: 1.5;"><br></span></div><div><span style=3D"line-height: 1.5;">=
Thank you,</span></div><div><span style=3D"line-height: 1.5;">Rob &nbsp;</=
span></div><div><br></div><div><br></div><div><br></div></body></html>=

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