StringIO example does not work

Question

I try to understand how works numpy.getfromtxt method and io.StringIO. On the officical website(https://docs.scipy.org/doc/numpy-1.13.0/reference/generated/num

Answer 1

Consider upgrading numpy because for the current version of numpy, your code just works as written. See the mention in 1.14.0 release note highlights and the section Encoding argument for text IO functions for the relevant changes in np.genfromtxt.

For older numpy, you use a string object for the input but the docs you linked say:

Note that generators must return byte strings in Python 3k. 

So do what the docs say and give it a byte string:

import io
s = io.BytesIO(b"1,1.3,abcde")