Hi,

It turns out that I haven’t been able to use PyArrow 4.0.0 either in Conda 
environments or python venvs. PyArrow does install using pip. However this is 
what I get if I ever want to use it:

>>> import pyarrow as pa
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
  File 
"/Users/karlkatzen/anaconda3/lib/python3.8/site-packages/pyarrow/__init__.py", 
line 63, in <module>
    import pyarrow.lib as _lib
ImportError: 
dlopen(/Users/karlkatzen/anaconda3/lib/python3.8/site-packages/pyarrow/lib.cpython-38-darwin.so,
 2): Symbol not found: __ZN5arrow10StopSource5tokenEv
  Referenced from: 
/Users/karlkatzen/anaconda3/lib/python3.8/site-packages/pyarrow/lib.cpython-38-darwin.so
  Expected in: /usr/local/lib/libarrow.400.dylib
 in 
/Users/karlkatzen/anaconda3/lib/python3.8/site-packages/pyarrow/lib.cpython-38-darwin.so
>>> pa
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
NameError: name 'pa' is not defined

On the other hand a Conda installation is not even possible. Does anyone know 
what’s going on?

Ying 

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