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This is documentation for an old release of NumPy (version 1.19). Read this page in the documentation of the latest stable release (version 2.2).

numpy.char.index

numpy.char.index(a, sub, start=0, end=None)

Like find, but raises ValueError when the substring is not found.

Calls str.index element-wise.

Parameters
aarray_like of str or unicode
substr or unicode
start, endint, optional
Returns
outndarray

Output array of ints. Returns -1 if sub is not found.

See also

find, str.find