numpy not sorting simple numpy array with duplicate items

Question

simple numpy array with repeats won't sort ? need AA AA AA AA AAPL AAPL AAPL etc.

this is the code

print('pre sort',my_symbols)
np.sort(my_symbols)
print('post sort',my_symbols)

which gives the output

pre sort ['AA' 'AAPL' 'AIG' 'AMZN' 'APOL' 'BA' 'BAC' 'BBY' 'BIDU' 'BMY' 'BTU' C' 'CAT' 'YUM' 'AA' 'AAPL' 'AIG' 'AMZN' 'APOL' 'BA' 'BAC' 'BBY' 'BIDU' 'BMY'  'BTU' 'C' 'CAT' 'YUM' 'AA' 'AAPL' 'AIG' 'AMZN' 'APOL' 'BA' 'BAC' 'BBY' 'BIDU' 'BMY' 'BTU' 'C' 'CAT' 'YUM' 'AA' 'AAPL' 'AIG' 'AMZN' 'APOL' 'BA' BAC' 'BBY' 'BIDU' 'BMY' 'BTU' 'C' 'CAT' 'YUM']



post sort ['AA' 'AAPL' 'AIG' 'AMZN' 'APOL' 'BA' 'BAC' 'BBY' 'BIDU' 'BMY' 'BTU' 'C' 'CAT' 'YUM' 'AA' 'AAPL' 'AIG' 'AMZN' 'APOL' 'BA' 'BAC' 'BBY' 'BIDU' 'BMY' 'BTU' 'C' 'CAT' 'YUM' 'AA' 'AAPL' 'AIG' 'AMZN' 'APOL' 'BA' 'BAC' 'BBY' 'BIDU' 'BMY' 'BTU' 'C' 'CAT' 'YUM' 'AA' 'AAPL' 'AIG' 'AMZN' 'APOL' 'BA' 'BAC' 'BBY' 'BIDU' 'BMY' 'BTU' 'C' 'CAT' 'YUM']

what am I doing wrong please

B. M. · Accepted Answer · 2016-04-26 20:01:46Z

3

The np.sort function is not in place, it returns an array. To sort in place you must use the array.sort method : my_symbols.sort().

answered Apr 26, 2016 at 20:01

B. M.

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