$ pex pyyaml
Python 2.7.10 (default, Dec 16 2015, 14:09:45)
[GCC 4.2.1 Compatible Apple LLVM 7.0.2 (clang-700.1.81)] on darwin
Type "help", "copyright", "credits" or "license" for more information.
(InteractiveConsole)
>>> import yaml
>>> yaml.__file__
'/private/var/folders/3t/xkwqrkld4xxgklk2s4n41jb80000gn/T/tmpfv6oUY/.deps/PyYAML-3.11-cp27-cp27m-macosx_10_4_x86_64.whl/yaml/__init__.py’