NumPy's undocumented type code

[Konrad Hinsen]

Nadav Horesh <nadavh at envision.co.il> writes:

> Recently I encountered an unfamiliar NumPy array type code -- <tt><font size=+1>"O"</font></tt>.

That's the "general object" array, its elements are arbitrary Python
objects. It can be a very convenient for some applications, but,
unlike with the other array types, the execution speed for arithmetic
operations etc. is no better than equivalent operations with lists.
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