ImportError: ...lib/python2.7/site-packages/numpy/core/multiarray.so: undefined symbol: PyUnicodeUCS4_AsUnicodeEscapeString

The above error means that you've got a Python interpreter compiled against UCS2 trying to run code that was compiled against UCS4. The solution I found was to recompile your lib (here NumPy) using a Python binary compiled with a --enable-unicode=ucs2