How to split string in numpy.ndarray?

Question

I have a lot of text in a numpy.ndarray that looks like this:

['This is example sentence 1.|This is example sentence 2.'
 'This is example sentence 3.'
 'This is example sentence 4.'
 'This is example sentence 5.'
 'This is example sentence 6.|This is example sentence 7.|This is example sentence 8.|This is example sentence 9.|This is example sentence 10.']

The array can have a large and varying number of elements and individual elements can have many sentences separated with "|".

How do I convert the example above into this:

 ['This is example sentence 1.'
 'This is example sentence 2.'
 'This is example sentence 3.'
 'This is example sentence 4.'
 'This is example sentence 5.'
 'This is example sentence 6.'
 'This is example sentence 7.'
 'This is example sentence 8.'
 'This is example sentence 9.'
 'This is example sentence 10.']

Basically, I'm trying to create a 1-dimensional array that will split elements with "|" into their own separate elements. I've tried many versions of split and can't get them to work for one reason or another.

Thanks!

Corralien · Accepted Answer · 2023-01-07 23:36:51Z

1

You can try np.char.split:

# np.concatenate or np.hstack
>>> np.concatenate(np.char.split(arr.astype(str), sep='|'))

array(['This is example sentence 1.', 'This is example sentence 2.',
       'This is example sentence 3.', 'This is example sentence 4.',
       'This is example sentence 5.', 'This is example sentence 6.',
       'This is example sentence 7.', 'This is example sentence 8.',
       'This is example sentence 9.', 'This is example sentence 10.'],
      dtype='<U28')

edited Jan 7, 2023 at 23:36

answered Jan 7, 2023 at 23:07

Corralien

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9 Comments

Rycliff Over a year ago

Thanks. I did this: np.concatenate(np.char.split(arr, sep='|')) and got error: "string operation on non-string array"

Rycliff Over a year ago

print(arr.dtype) = "object"

Corralien Over a year ago

How is your array created? You probably have mixed types (and what is the output of arr.shape?) I think your data are not clean.

Corralien Over a year ago

Another try: np.concatenate(np.char.split(arr.astype(str), sep='|'))

Rycliff Over a year ago

Thank you Corralien!!!! Your solution works perfectly!!!

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