array(obj, itemsize=None, copy=True, unicode=None, order=None)
This class is provided for numarray backward-compatibility. New code (not concerned with numarray compatibility) should use arrays of type :None:None:`string_` or :None:None:`unicode_` and use the free functions in :None:mod:`numpy.char <numpy.core.defchararray>` for fast vectorized string operations instead.
Versus a regular NumPy array of type :None:None:`str` or :None:None:`unicode`, this class adds the following functionality:
values automatically have whitespace removed from the end when indexed
comparison operators automatically remove whitespace from the end when comparing values
vectorized string operations are provided as methods (e.g.
:None:None:`str.endswith`) and infix operators (e.g.+, *, %)
:None:None:`itemsize` is the number of characters per scalar in the resulting array. If :None:None:`itemsize` is None, and :None:None:`obj` is an object array or a Python list, the :None:None:`itemsize` will be automatically determined. If :None:None:`itemsize` is provided and :None:None:`obj` is of type str or unicode, then the :None:None:`obj` string will be chunked into :None:None:`itemsize` pieces.
If true (default), then the object is copied. Otherwise, a copy will only be made if __array__ returns a copy, if obj is a nested sequence, or if a copy is needed to satisfy any of the other requirements (:None:None:`itemsize`, unicode, :None:None:`order`, etc.).
When true, the resulting chararray
can contain Unicode characters, when false only 8-bit characters. If unicode is None and :None:None:`obj` is one of the following:
a
chararray,an ndarray of type
:None:None:`str`or:None:None:`unicode`a Python str or unicode object,
then the unicode setting of the output array will be automatically determined.
Specify the order of the array. If order is 'C' (default), then the array will be in C-contiguous order (last-index varies the fastest). If order is 'F', then the returned array will be in Fortran-contiguous order (first-index varies the fastest). If order is 'A', then the returned array may be in any order (either C-, Fortran-contiguous, or even discontiguous).
Create a chararray
.
The following pages refer to to this document either explicitly or contain code examples using this.
numpy.chararray
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