<s>
Python-based	O
Simulations	O
of	O
Chemistry	O
Framework	O
(	O
PySCF	B-Application
)	O
is	O
an	O
ab	O
initio	O
computational	O
chemistry	O
program	O
natively	O
implemented	O
in	O
Python	B-Language
program	I-Language
language	O
.	O
</s>
<s>
Although	O
most	O
functions	O
are	O
written	O
in	O
Python	B-Language
,	O
the	O
computation	O
critical	O
modules	O
are	O
intensively	O
optimized	O
in	O
C	B-Language
.	O
As	O
a	O
result	O
,	O
the	O
package	O
works	O
as	O
efficient	O
as	O
other	O
C/Fortran	O
-based	O
quantum	O
chemistry	O
program	O
.	O
</s>
<s>
PySCF	B-Application
is	O
developed	O
by	O
Qiming	O
Sun	O
.	O
</s>
