<s>
IronPython	B-Application
is	O
an	O
implementation	O
of	O
the	O
Python	B-Language
programming	I-Language
language	I-Language
targeting	O
the	O
.NET	B-Application
Framework	I-Application
and	O
Mono	B-Application
.	O
</s>
<s>
IronPython	B-Application
2.0	O
was	O
released	O
on	O
December	O
10	O
,	O
2008	O
.	O
</s>
<s>
Microsoft	O
abandoned	O
IronPython	B-Application
(	O
and	O
its	O
sister	O
project	O
IronRuby	B-Language
)	O
in	O
late	O
2010	O
,	O
after	O
which	O
Hugunin	O
left	O
to	O
work	O
at	O
Google	O
.	O
</s>
<s>
The	O
project	O
is	O
currently	O
maintained	O
by	O
a	O
group	O
of	O
volunteers	O
at	O
GitHub	B-Application
.	O
</s>
<s>
It	O
is	O
free	O
and	O
open-source	O
software	O
,	O
and	O
can	O
be	O
implemented	O
with	O
Python	B-Language
Tools	O
for	O
Visual	B-Application
Studio	I-Application
,	O
which	O
is	O
a	O
free	O
and	O
open-source	O
extension	O
for	O
Microsoft	O
's	O
Visual	B-Application
Studio	I-Application
IDE	O
.	O
</s>
<s>
IronPython	B-Application
is	O
written	O
entirely	O
in	O
C#	B-Application
,	O
although	O
some	O
of	O
its	O
code	O
is	O
automatically	O
generated	O
by	O
a	O
code	O
generator	O
written	O
in	O
Python	B-Language
.	O
</s>
<s>
IronPython	B-Application
is	O
implemented	O
on	O
top	O
of	O
the	O
Dynamic	B-Application
Language	I-Application
Runtime	I-Application
(	O
DLR	O
)	O
,	O
a	O
library	O
running	O
on	O
top	O
of	O
the	O
Common	O
Language	O
Infrastructure	O
that	O
provides	O
dynamic	O
typing	O
and	O
dynamic	O
method	O
dispatch	O
,	O
among	O
other	O
things	O
,	O
for	O
dynamic	O
languages	O
.	O
</s>
<s>
The	O
DLR	O
is	O
part	O
of	O
the	O
.NET	B-Application
Framework	I-Application
4.0	O
and	O
is	O
also	O
a	O
part	O
of	O
Mono	B-Application
since	O
version	O
2.4	O
from	O
2009	O
.	O
</s>
<s>
Release	O
2.0	O
,	O
released	O
on	O
December	O
10	O
,	O
2008	O
,	O
and	O
updated	O
as	O
2.0.3	O
on	O
October	O
23	O
,	O
2009	O
,	O
targets	O
CPython	B-Language
2.5	O
.	O
</s>
<s>
IronPython	B-Application
2.0.3	O
is	O
only	O
compatible	O
up	O
to	O
.NET	B-Application
Framework	I-Application
3.5	O
.	O
</s>
<s>
Release	O
2.6	O
,	O
released	O
on	O
December	O
11	O
,	O
2009	O
,	O
and	O
updated	O
on	O
April	O
12	O
,	O
2010	O
,	O
targets	O
CPython	B-Language
2.6	O
.	O
</s>
<s>
IronPython	B-Application
2.6.1	O
versions	O
is	O
binary	O
compatible	O
only	O
with	O
.NET	B-Application
Framework	I-Application
4.0	O
.	O
</s>
<s>
IronPython	B-Application
2.6.1	O
must	O
be	O
compiled	O
from	O
sources	O
to	O
run	O
on	O
.NET	B-Application
Framework	I-Application
3.5	O
.	O
</s>
<s>
IronPython	B-Application
2.6.2	O
,	O
released	O
on	O
October	O
21	O
,	O
2010	O
,	O
is	O
binary	O
compatible	O
with	O
both	O
.NET	B-Application
Framework	I-Application
4.0	O
and	O
.NET	B-Application
Framework	I-Application
3.5	O
.	O
</s>
<s>
Release	O
2.7	O
was	O
released	O
on	O
March	O
12	O
,	O
2011	O
and	O
it	O
targets	O
CPython	B-Language
2.7	O
.	O
</s>
<s>
Release	O
2.7.1	O
was	O
released	O
on	O
October	O
21	O
,	O
2011	O
and	O
it	O
targets	O
CPython	B-Language
2.7	O
.	O
</s>
<s>
It	O
enables	O
support	O
for	O
ZIP	B-General_Concept
file	I-General_Concept
format	I-General_Concept
libraries	O
,	O
SQLite	B-Language
,	O
and	O
compiled	O
executables	O
.	O
</s>
<s>
Release	O
2.7.8	O
was	O
released	O
on	O
February	O
16	O
,	O
2018	O
and	O
consists	O
of	O
bug	O
fixes	O
,	O
reorganized	O
code	O
,	O
and	O
an	O
updated	O
test	O
infrastructure	O
(	O
including	O
significant	O
testing	O
on	O
Linux	B-Application
under	O
Mono	B-Application
)	O
.	O
</s>
<s>
It	O
is	O
also	O
the	O
first	O
release	O
to	O
support	O
.NET	B-Application
Core	I-Application
.	O
</s>
<s>
It	O
is	O
intended	O
to	O
be	O
the	O
last	O
release	O
before	O
IronPython	B-Application
3	O
.	O
</s>
<s>
Release	O
2.7.10	O
was	O
released	O
on	O
April	O
27	O
,	O
2020	O
and	O
adds	O
.NET	B-Application
Core	I-Application
3.1	I-Application
support	O
.	O
</s>
<s>
Release	O
2.7.11	O
was	O
released	O
on	O
November	O
17	O
,	O
2020	O
and	O
resolves	O
issues	O
when	O
running	O
on	O
.NET	B-Application
5	I-Application
.	O
</s>
<s>
There	O
are	O
some	O
differences	O
between	O
the	O
Python	B-Language
reference	O
implementation	O
CPython	B-Language
and	O
IronPython	B-Application
.	O
</s>
<s>
Some	O
projects	O
built	O
on	O
top	O
of	O
IronPython	B-Application
are	O
known	O
not	O
to	O
work	O
under	O
CPython	B-Language
.	O
</s>
<s>
,	O
unless	O
they	O
are	O
implemented	O
in	O
a	O
.NET	B-Application
interop	O
.	O
</s>
<s>
For	O
example	O
,	O
NumPy	B-Application
was	O
wrapped	O
by	O
Microsoft	O
in	O
2011	O
,	O
allowing	O
code	O
and	O
libraries	O
dependent	O
on	O
it	O
to	O
be	O
run	O
directly	O
from	O
.NET	B-Application
Framework	I-Application
.	O
</s>
<s>
IronPython	B-Application
is	O
supported	O
on	O
Silverlight	B-Application
(	O
which	O
is	O
deprecated	O
by	O
Microsoft	O
and	O
already	O
has	O
lost	O
support	O
in	O
most	O
web	O
browsers	O
)	O
.	O
</s>
<s>
It	O
can	O
be	O
used	O
as	O
a	O
scripting	O
engine	O
in	O
the	O
browser	O
just	O
like	O
the	O
JavaScript	B-Language
engine	O
.	O
</s>
<s>
IronPython	B-Application
scripts	O
are	O
passed	O
like	O
simple	O
client-side	O
JavaScript	B-Language
scripts	O
in	O
xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx1-tags	O
.	O
</s>
<s>
It	O
is	O
then	O
also	O
possible	O
to	O
modify	O
embedded	O
XAML	B-Device
markup	O
.	O
</s>
<s>
The	O
same	O
works	O
for	O
IronRuby	B-Language
.	O
</s>
<s>
Until	O
version	O
0.6	O
,	O
IronPython	B-Application
was	O
released	O
under	O
the	O
terms	O
of	O
Common	O
Public	O
License	O
.	O
</s>
<s>
Following	O
recruitment	O
of	O
the	O
project	O
lead	O
in	O
August	O
2004	O
,	O
IronPython	B-Application
was	O
made	O
available	O
as	O
part	O
of	O
Microsoft	O
's	O
Shared	B-License
Source	I-License
initiative	I-License
.	O
</s>
<s>
With	O
the	O
2.0	O
alpha	O
release	O
,	O
the	O
license	O
was	O
changed	O
to	O
the	O
Microsoft	B-License
Public	I-License
License	I-License
,	O
which	O
the	O
OSI	O
has	O
approved	O
.	O
</s>
<s>
The	O
latest	O
versions	O
are	O
released	O
under	O
the	O
terms	O
of	O
the	O
Apache	B-Application
License	I-Application
2.0	I-Application
.	O
</s>
<s>
One	O
of	O
IronPython	B-Application
's	O
key	O
advantages	O
is	O
in	O
its	O
function	O
as	O
an	O
extensibility	O
layer	O
to	O
application	O
frameworks	O
written	O
in	O
a	O
.NET	B-Application
language	O
.	O
</s>
<s>
It	O
is	O
relatively	O
simple	O
to	O
integrate	O
an	O
IronPython	B-Application
interpreter	O
into	O
an	O
existing	O
.NET	B-Application
application	O
framework	O
.	O
</s>
<s>
Once	O
in	O
place	O
,	O
downstream	O
developers	O
can	O
use	O
scripts	O
written	O
in	O
IronPython	B-Application
that	O
interact	O
with	O
.NET	B-Application
objects	O
in	O
the	O
framework	O
,	O
thereby	O
extending	O
the	O
functionality	O
in	O
the	O
framework	O
's	O
interface	O
,	O
without	O
having	O
to	O
change	O
any	O
of	O
the	O
framework	O
's	O
code	O
base	O
.	O
</s>
<s>
IronPython	B-Application
makes	O
extensive	O
use	O
of	O
reflection	B-Language
.	O
</s>
<s>
When	O
passed	O
in	O
a	O
reference	O
to	O
a	O
.NET	B-Application
object	O
,	O
it	O
will	O
automatically	O
import	O
the	O
types	O
and	O
methods	O
available	O
to	O
that	O
object	O
.	O
</s>
<s>
This	O
results	O
in	O
a	O
highly	O
intuitive	O
experience	O
when	O
working	O
with	O
.NET	B-Application
objects	O
from	O
within	O
an	O
IronPython	B-Application
script	O
.	O
</s>
<s>
The	O
following	O
IronPython	B-Application
script	O
manipulates	O
.NET	B-Application
Framework	I-Application
objects	O
.	O
</s>
<s>
In	O
this	O
case	O
,	O
assume	O
that	O
the	O
.NET	B-Application
Framework	I-Application
implements	O
a	O
class	O
,	O
BookDictionary	O
,	O
in	O
a	O
module	O
called	O
BookService	O
,	O
and	O
publishes	O
an	O
interface	O
into	O
which	O
IronPython	B-Application
scripts	O
can	O
be	O
sent	O
and	O
executed	O
.	O
</s>
<s>
The	O
following	O
script	O
uses	O
the	O
.NET	B-Application
Framework	I-Application
to	O
create	O
a	O
simple	O
Hello	O
World	O
message	O
.	O
</s>
<s>
The	O
performance	O
characteristics	O
of	O
IronPython	B-Application
compared	O
to	O
CPython	B-Language
,	O
the	O
reference	O
implementation	O
of	O
Python	B-Language
,	O
depends	O
on	O
the	O
exact	O
benchmark	O
used	O
.	O
</s>
<s>
IronPython	B-Application
performs	O
worse	O
than	O
CPython	B-Language
on	O
most	O
benchmarks	O
taken	O
with	O
the	O
PyStone	O
script	O
but	O
better	O
on	O
other	O
benchmarks	O
.	O
</s>
<s>
IronPython	B-Application
may	O
perform	O
better	O
in	O
Python	B-Language
programs	I-Language
that	O
use	O
threads	O
or	O
multiple	O
cores	O
,	O
as	O
it	O
has	O
a	O
JIT	O
compiler	O
,	O
and	O
also	O
because	O
it	O
does	O
n't	O
have	O
the	O
Global	B-Operating_System
Interpreter	I-Operating_System
Lock	I-Operating_System
.	O
</s>
