R. David Murray added the comment:

If a warning is causing iPython to hang, there is something seriously wrong 
with iPython.  A warning is just a message written to stderr, it doesn't affect 
the execution of the program.

The json module does not natively support datetime, so whatever is happening, 
it is being triggered by non-stdlib code (probably a json subclass in the vcs 
package you are working with).  I suggest you pursue this with the community 
that originated the vcs package.

----------
nosy: +r.david.murray
resolution:  -> third party
stage:  -> resolved
status: open -> closed
type:  -> behavior

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Python tracker <rep...@bugs.python.org>
<http://bugs.python.org/issue30063>
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