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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2 Answers
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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numpy.fromstring() is useful for reading numbers, but for tokenizing strings you can do this:
numpy.core.defchararray.split(data, sep=",") 
1 Comment
devinbost
This produces a numpy array with a list inside of it.