Exception: tostring() has been removed. Please call tobytes() instead.

[Amrithasuresh]

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I was working on this notebook tutorial.

I tried this step 'm = Chem.MolFromSmiles('COc1ccc2c(c1)[nH]c(n2)S@@Cc1ncc(c(c1C)OC)C')' 'm'

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Exception Traceback (most recent call last) /usr/local/lib/python2.7/dist-packages/IPython/core/formatters.pyc in call(self, obj) 309 method = get_real_method(obj, self.print_method) 310 if method is not None: --> 311 return method() 312 return None 313 else:

/usr/lib/python2.7/dist-packages/rdkit/Chem/Draw/IPythonConsole.pyc in _toPNG(mol) 92 try: 93 img = Draw.MolToImage(mc,size=molSize,kekulize=kekulizeStructures, ---> 94 highlightAtoms=highlightAtoms) 95 except ValueError: # <- can happen on a kekulization failure 96 mc = copy.deepcopy(mol)

/usr/lib/python2.7/dist-packages/rdkit/Chem/Draw/init.pyc in MolToImage(mol, size, kekulize, wedgeBonds, fitImage, options, canvas, **kwargs) 92 raise ValueError('Null molecule provided') 93 if canvas is None: ---> 94 img,canvas=_createCanvas(size) 95 else: 96 img=None

/usr/lib/python2.7/dist-packages/rdkit/Chem/Draw/init.pyc in _createCanvas(size) 48 from PIL import Image 49 img = Image.new("RGBA",size,(0,0,0,0)) ---> 50 canvas = Canvas(img) 51 else: 52 from rdkit.Chem.Draw.spingCanvas import Canvas

/usr/lib/python2.7/dist-packages/rdkit/Chem/Draw/cairoCanvas.pyc in init(self, image, size, ctx, imageType, fileName) 65 if image is not None: 66 try: ---> 67 imgd = image.tostring("raw","BGRA") 68 except SystemError: 69 r,g,b,a = image.split()

/usr/lib/python2.7/dist-packages/PIL/Image.pyc in tostring(self, *args, **kw) 693 def tostring(self, *args, **kw): 694 raise Exception("tostring() has been removed. " + --> 695 "Please call tobytes() instead.") 696 697 def tobitmap(self, name="image"):

Exception: tostring() has been removed. Please call tobytes() instead.

As per this message. It seems I have to switch to older version of Pillow. I did that "pip install Pillow==2.1.0". Is that right?.

It does solve the issue. Just reporting it may help someone.