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Subject: Brython 2.0 (Python in the browser)
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Xref: csiph.com comp.lang.python.announce:1222

Hi,

Brython (Browser Python) is an implementation of Python 3 in the browser. I=
ts goal is to be able to write client-side programs in Python instead of Ja=
vascript, with code inside tags <script type=3D"text/python>...</script>. A=
s opposed to solutions such as Pyjamas or Py2JS, the translation from Pytho=
n to Javascript is done in the browser, it doesn't require a precompilation=
 by a Python program

Launched late 2012, Brython is attracting a growing community of Python dev=
elopers. Version 2.0 supports most of the CPython syntax and improves the i=
nteraction with Javascript libraries. The complete changelog is detailed be=
low

The main entry point is the Brython site at http://www.brython.info, with a=
n online editor and demos
Development is hosted by Bitbucket : https://bitbucket.org/olemis/brython/s=
rc
Join us on the Google group : https://groups.google.com/forum/?fromgroups=
=3D#!forum/brython

- Pierre


Changes in Brython version 2.0-20140209-164925
=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=
=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D

Backwards-incompatible change
=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=
=3D=3D=3D=3D
For the sake of namespace isolation, by default, the name of functions and =
classes defined in Brython are no more available in Javascript global names=
pace. As a consequence, functions can't be called as event callbacks from H=
TML tags. For instance, if a function echo() is defined in a Brython script=
, the following inline code :

    <button onclick=3D"echo()">

will result in a Javascript error such as "name echo is not defined" when t=
he button is clicked

The solution is to define the event callback inside Brython code. The butto=
n must have an id :

    <button id=3D"echo">

and the Brython code must include the line

    doc["echo"].bind("click",echo)

Alternatively, to force the name "echo" into the global Javascript namespac=
e, add it as an attribute of the window object :

    from browser import window
    window.echo =3D echo

Features
=3D=3D=3D=3D=3D=3D=3D=3D
- namespace isolation : in previous versions, the names defined in Brython =
core scripts were included in the global Javascript namespace, raising risk=
s of conflict with names defined in Javascript programs or libraries. In th=
is version, the only names included in the global Javascript namespace are =
__BRYTHON__ (used internally) and brython(), the function called on page lo=
ad
- implement sys.implementation with values adapted for Brython
- allow syntax del (x, y, z)
- use Dan McDougall's pyminifier to reduce size of py_VFS.js
- make_dist generates a script brython_dist.js that can be used as a standa=
lone distribution on a centralised server.

Demos
=3D=3D=3D=3D=3D
- add drop files demo (by Glenn Linderman) and French Python course (using =
module slideshow) to the gallery

Imports
=3D=3D=3D=3D=3D=3D=3D
- improved version of py_VFS.js by Billy Earney. py_VFS compiles the standa=
rd library to make imports faster. Now packs Python source with JSON instea=
d of base64

Built-in modules
=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D
- browser : add attributes "window" and "document" as alias of respectively=
 "win" and "doc"
- add a module browser/slideshow for PowerPoint-like slideshows in Brython,=
 using a custom file format

Bug fixes
=3D=3D=3D=3D=3D=3D=3D=3D=3D
- issue #174 : string format character % has wrong precedence
- issue #175 : Functions should return None by default
- issue #183 : re.findall() broken
- issue #198 : operator precedence not defined for << and >>
- issue #206 : add <noscript> in case Javascript is disabled
- issue #208 : bug with try / else
- issue #209 : bug in ternary operator
- function definions must be evaluated only once, upon function definition
- bug with del a[:]
- bug with dir() called without arguments
- bug in map()
- bug with "func(x=3D1,)" ; "return +x" ; "func(10*-x)"
- bug in divmod and round
- bug in local_storage method keys()
- add attribute __doc__ to class and instance methods

Documentation
=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D
- updated with the changes introduced in this version
- add documentation for the built-in module javascript
- translation in Spanish updated by Kiko Correoso