dtypes. Difference between S1 and S2 in Python

Question

I have two arrays of strings:

In [51]: r[\'Z\']
Out[51]: 
array([\'0\', \'0\', \'0\', ..., \'0\', \'0\', \'0\'], 
      dtype=\'|S1\')

In [52]: r[\'Y\']             


        

Answer 1

See the dtypes documentation.

The |S1 and |S2 strings are data type descriptors; the first means the array holds strings of length 1, the second of length 2. The | pipe symbol is the byteorder flag; in this case there is no byte order flag needed, so it's set to |, meaning not applicable.