I get this error that I do not understand. Does anyone know what is happening and how to get around it

...

...

import atpy t = atpy.Table() name = ["aa","bb","cc"] t.add_column("name",name) k = [1,2,3] t.add_column("num",k) t <Table name='None' rows=3 fields=2> name = ["aaa","bbb","ccc"] p = atpy.Table() p.add_column("name",name) p.add_column("num",k) t.append(p) Traceback (most recent call last): File "<stdin>", line 1, in <module> File "/Library/Frameworks/Python.framework/Versions/2.7/lib/python2.7/site-packages/atpy/basetable.py", line 301, in append raise Exception("Columns do not match") Exception: Columns do not match nn = t.name.astype("|S3") t.remove_columns("name") t.add_column("name",nn) t.append(p) Traceback (most recent call last): File "<stdin>", line 1, in <module> File "/Library/Frameworks/Python.framework/Versions/2.7/lib/python2.7/site-packages/atpy/basetable.py", line 302, in append self.data = np.hstack((self.data, table.data)) File "/Library/Frameworks/Python.framework/Versions/2.7/lib/python2.7/site-packages/numpy/core/shape_base.py", line 258, in hstack return _nx.concatenate(map(atleast_1d,tup),1) TypeError: expected a readable buffer object

Cheers Tommy