Dear all,

I've noticed a problem with anaconda python on the Mac. This may also be a
problem on linux, but I haven't tested that yet.

Due to some changes in the way the anaconda team is doing python builds,
the most recent conda python builds seem to no longer work with the RDKit.
The symptom is an error message like "Fatal Python error:
PyThreadState_Get: no current thread" when you try to import the rdkit.

I've observed this for the newest 3.5 (3.5.4-hf91e954_15) and 3.6
(3.6.2-hd0bf7f1_15) builds. A workaround is to downgrade to 3.5.3 (conda
install python=3.5.3) or 3.6.1 (conda install python=3.6.1).

I haven't yet figured out how to handle this "correctly" - and based on
some preliminary email conversation with Riccardo it looks non-trivial - so
please be sure you're using the earlier python versions with the RDKit

Apologies for this,
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