Ned Deily added the comment:

FWIW, works for me using the python.org 3.4 64-bin installer.  What is the 
output of:

python3 -c 'import sys;print(sys.version)'

As Claudiu suggests, check for a concurrent.py shadowing the standard library 
version.

Also, why are you setting PYTHONPATH to include 
/Library/Frameworks/Python.framework/Versions/{3.4,2.7}/lib/python3.4/site-packages/?
  Those are the standard locations for site-packages are included automatically 
in sys.path by the respective interpreters.  Setting PYTHONPATH should not 
normally be needed.

----------
nosy: +ned.deily

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