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up vote 1 down vote favorite

I have a string of data data = "1,Hey,234,4456,789" that I want to convert into a numpy array. Whenever I try the code numpy.fromstring(data,dtype=str,sep=","), I get the error "ValueError: zero-valued itemsize". What is the correct way to use this function so that it works as intended? The output I am trying to get is np.array(['1','Hey','234','4456','789']). Thanks!

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up vote 1 down vote accepted

Just turn the string into a list of strings (with split) and give that to array.

In [21]: np.array("1,Hey,234,4456,789".split(','))
Out[21]: 
array(['1', 'Hey', '234', '4456', '789'], 
      dtype='|S4')
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I did that and it worked! Thanks – Lahav Dec 5 '15 at 5:02
up vote 1 down vote

numpy.fromstring() is useful for reading numbers, but for tokenizing strings you can do this:

numpy.core.defchararray.split(data, sep=",")
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