Convert string to numpy array of strings

Question

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!

hpaulj · Accepted Answer · 2015-12-05 05:01:12Z

4

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')

answered Dec 5, 2015 at 5:01

hpaulj

233k14 gold badges260 silver badges392 bronze badges

Sign up to request clarification or add additional context in comments.

Comments

John Zwinck · Accepted Answer · 2015-12-05 03:09:22Z

2

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

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

answered Dec 5, 2015 at 3:09

John Zwinck

252k44 gold badges346 silver badges459 bronze badges

1 Comment

devinbost Over a year ago

This produces a numpy array with a list inside of it.

Collectives™ on Stack Overflow

Convert string to numpy array of strings

2 Answers 2

Comments

1 Comment

Your Answer

Hot Network Questions

Collectives™ on Stack Overflow

2 Answers 2

Comments

1 Comment

Your Answer

Sign up or log in

Post as a guest

Related