rdkit: Error drawing molecule with MolDraw2DSVG

Hi all,

I’ve been following along on this blog post in a IPython notebook. However, when I get to step 4 in the blog post (using identical code), I get the following error:

---------------------------------------------------------------------------
ArgumentError                             Traceback (most recent call last)
<ipython-input-13-0f637ca1e274> in <module>()
----> 1 SVG(moltosvg(m))

<ipython-input-12-f15ebd7dae1f> in moltosvg(mol, molSize, kekulize)
      9             mc = Chem.Mol(mol.ToBinary())
     10     if not mc.GetNumConformers():
---> 11         rdDepictor.Compute2DCoords(mc)
     12     drawer = rdMolDraw2D.MolDraw2DSVG(molSize[0],molSize[1])
     13     drawer.DrawMolecule(mc)

ArgumentError: Python argument types in
    rdkit.Chem.rdDepictor.Compute2DCoords(Mol)
did not match C++ signature:
    Compute2DCoords(RDKit::ROMol {lvalue} mol, bool canonOrient=True, bool clearConfs=True, boost::python::dict {lvalue} coordMap={}, unsigned int nFlipsPerSample=0, unsigned int nSample=0, int sampleSeed=0, bool permuteDeg4Nodes=False, double bondLength=-1.0)

If I try to use a non-SMILES pathway, using a molecule from the ZINC database like this one (you can download the mol2 file from there), I get the following error:

---------------------------------------------------------------------------
ArgumentError                             Traceback (most recent call last)
<ipython-input-16-0f637ca1e274> in <module>()
----> 1 SVG(moltosvg(m))

<ipython-input-15-ba161ab9d915> in moltosvg(mol, molSize, kekulize)
     12         rdDepictor.Compute2DCoords(mc)
     13     drawer = rdMolDraw2D.MolDraw2DSVG(molSize[0],molSize[1])
---> 14     drawer.DrawMolecule(mc)
     15     drawer.FinishDrawing()
     16     svg = drawer.GetDrawingText()

ArgumentError: Python argument types in
    MolDraw2D.DrawMolecule(MolDraw2DSVG, Mol)
did not match C++ signature:
    DrawMolecule(RDKit::MolDraw2D {lvalue} self, RDKit::ROMol mol, boost::python::api::object highlightAtoms, boost::python::api::object highlightBonds, boost::python::api::object highlightAtomColors=None, boost::python::api::object highlightBondColors=None, boost::python::api::object highlightAtomRadii=None, int confId=-1)
    DrawMolecule(RDKit::MolDraw2D {lvalue} self, RDKit::ROMol mol, boost::python::api::object highlightAtoms=None, boost::python::api::object highlightAtomColors=None, boost::python::api::object highlightAtomRadii=None, int confId=-1)

I am lost because I don’t know C/C++ or python bindings very well. Any hints as to what’s going wrong or what I’m doing wrong?

(Side note: I don’t know what this means, but I was looking through the source code I noticed that it appears (to my naive eyes) that there is a duplicated piece of code here.)

Other helpful info:

Platform: OS X 10.10.5
IPython Version: 4.0.1
Python version: 3.4.3
RDkit version: rdkit 2015.09.1 py34_1 (downloaded from conda)