<s>
PLY	B-Language
is	O
a	O
parsing	B-Language
tool	O
written	O
purely	O
in	O
Python	B-Language
.	O
</s>
<s>
It	O
is	O
,	O
in	O
essence	O
,	O
a	O
re-implementation	O
of	O
Lex	B-General_Concept
and	O
Yacc	B-Application
originally	O
in	O
C-language	B-Language
.	O
</s>
<s>
PLY	B-Language
uses	O
the	O
same	O
LALR	B-Application
parsing	I-Application
technique	O
as	O
Lex	B-General_Concept
and	O
Yacc	B-Application
.	O
</s>
<s>
Implemented	O
in	O
Python	B-Language
,	O
it	O
has	O
almost	O
all	O
the	O
features	O
provided	O
by	O
Lex	B-General_Concept
and	O
Yacc	B-Application
.	O
</s>
<s>
It	O
supports	O
Python	B-Language
3	O
.	O
</s>
<s>
PLY	B-Language
has	O
the	O
following	O
two	O
Python	B-Language
modules	O
which	O
are	O
part	O
of	O
the	O
ply	B-Language
package	O
.	O
</s>
