object types for rpy2py_basic in rpy_classic

[lgautier]

Original report by Anonymous.

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The object type LANGSXP needs to be added to the objects that the rpy2py_basic function can handle in rpy_classic

[lgautier]

Original comment by Laurent Gautier (Bitbucket: lgautier, GitHub: lgautier).

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The question is how.
How does rpy convert a LANGSXP into a pure python object ?

[lgautier]

Original comment by Anonymous.

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It doesn't convert, it just leaves it as an R object. However, when rpy_classic runs across a LANGSXP it raises a Value Error:

File "/Library/Frameworks/Python.framework/Versions/2.6/lib/python2.6/site-packages/rpy2/rpy_classic.py", line 160, in rpy2py_basic
raise ValueError("Invalid type %i (%s) for 'obj'." %(obj.typeof, ri.str_typeint(obj.typeof)))
ValueError: Invalid type 6 (LANGSXP) for 'obj'.

I think the problem is that LANGSXP objects have a length attribute, and so they aren't being passed to the res = Robj(obj) command, but instead are being passed to the conversion commands which don't know what to do with it.

[lgautier]

Original comment by Anonymous.

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I tried the following modification of the rpy2py_basic function that seems to work (bold indicates my additions):
`
#!python

def rpy2py_basic(obj):
if hasattr(obj, 'len'):
if obj.typeof in [ri.INTSXP, ri.REALSXP, ri.CPLXSXP,
ri.LGLSXP, ri.STRSXP]:
res = [x for x in obj]
elif obj.typeof in [ri.VECSXP]:
res = [rpy2py(x) for x in obj]
elif obj.typeof in [ri.LANGSXP]:
res = Robj(obj)
else:
raise ValueError("Invalid type %i (%s) for 'obj'." %(obj.typeof, ri.str_typeint(obj.typeof)))
else:
res = Robj(obj)
return res

[lgautier]

Original comment by Laurent Gautier (Bitbucket: lgautier, GitHub: lgautier).

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Bump!

[lgautier]

Original comment by Laurent Gautier (Bitbucket: lgautier, GitHub: lgautier).

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The fix is now in the branch rpy2-2.1dev

[lgautier]

Original comment by Laurent Gautier (Bitbucket: lgautier, GitHub: lgautier).

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Removing version: 2.1.0 (automated comment)