<s>
PyQuante	B-Application
is	O
an	O
open-source	O
(	O
BSD	B-Operating_System
)	O
suite	O
of	O
programs	O
for	O
developing	O
quantum	O
chemistry	O
methods	O
using	O
Gaussian	O
type	O
orbital	O
(	O
GTO	O
)	O
basis	O
sets	O
.	O
</s>
<s>
The	O
program	O
is	O
written	O
in	O
the	O
Python	B-Language
programming	I-Language
language	I-Language
,	O
but	O
has	O
"	O
rate-determining	O
"	O
modules	O
written	O
in	O
C	B-Language
for	O
speed	O
,	O
and	O
also	O
uses	O
and	O
requires	O
the	O
NumPy	B-Application
linear	O
algebra	O
extensions	O
to	O
Python	B-Language
.	O
</s>
<s>
PyQuante	B-Application
1.6.3	O
is	O
the	O
latest	O
stable	O
version	O
of	O
the	O
program	O
.	O
</s>
<s>
Two	O
electron	O
integrals	O
computed	O
using	O
Huzinaga	O
,	O
Rys	O
,	O
or	O
Head-Gordon/Pople	O
techniques	O
;	O
C	B-Language
and	O
Python	B-Language
interfaces	O
to	O
these	O
programs	O
;	O
</s>
