Hi Steve,

sorry, my bad. Use "wt+".

p.


On 02/09/2018 15:26, Sharky El Sharko wrote:

Hi Paolo,

I'm afraid I get the same error with 'wb+'.

S


On 02/09/18 15:24, Paolo Tosco wrote:
Hi Steve,

Try replacing “w+” with “wb+” to open the file as a binary stream.

Cheers,
p.

On 2 Sep 2018, at 16:13, Sharky El Sharko <sharky.el.sha...@gmail.com <mailto:sharky.el.sha...@gmail.com>> wrote:

Hi,

Please can someone tell me why I am getting an error writing a gzipped sdf, and how to fix it.  I am running python 3.6.5 with the latest RDKit (2018.03.3), and the following code:

#!/usr/bin/env python

import gzip
from rdkit import Chem

outfZ = gzip.open('out02.sdf.gz', 'w+')
writer = Chem.SDWriter(outfZ)
m1 = Chem.MolFromSmiles('Cc1ccccc1')
m2 = Chem.MolFromSmiles('Nc1ccccc1')
list_of_mols = [m1, m2]
for mol in list_of_mols:
    writer.write(mol)
writer.close()
outfZ.close()


gives the following error:

Traceback (most recent call last):
  File "./exampleGzip02.py", line 12, in <module>
    writer.write(mol)
  File "/xxx/yyy/miniconda2/envs/my-rdkit-env/lib/python3.6/gzip.py", line 260, in write
    data = memoryview(data)
TypeError: memoryview: a bytes-like object is required, not 'str'


I tried a few ways to wrestle the mol into a binary format, but without success.  Can anyone enlighten me, please.


Thanks very much.


Kind regards,


Steve

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