Author Archives: J. D. Bartlett

Happy Birthday Sqizit!

Posted on Tuesday 3 April 2012 by J. D. Bartlett

Today is exactly 2 years since my first blog post on sqizit.bartletts.id.au. To celebrate, here’s some highlights and history from Sqizit. Highlights 4 posts on music, including sheet music of my piano composition For Mandie. Pretty swirls in Python. Some … Continue reading →

Posted in short | Tagged birthday, highlights, history, sqizit | 9 Comments

Something Fishy with Python ASTs

Posted on Monday 19 March 2012 by J. D. Bartlett

$ python
Python 2.7.1+ (r271:86832, Apr 11 2011, 18:05:24) 
[GCC 4.5.2] on linux2
Type "help", "copyright", "credits" or "license" for more information.
>>> import ast
>>> m = ast.parse('from __future__ import division')
>>> m
<_ast.Module object at 0xb764418c>
>>> compile(m, '<string>', 'exec')
 at 0xb7636e78, file "<string>", line 1>

$ python

Python 2.7.1+ (r271:86832, Apr 11 2011, 18:05:24)

[GCC 4.5.2] on linux2

Type "help", "copyright", "credits" or "license" for more information.

>>> import ast

>>> m = ast.parse('from __future__ import division')

>>> m

<_ast.Module object at 0xb764418c>

>>> compile(m, '<string>', 'exec')

at 0xb7636e78, file "<string>", line 1>

Ok, so far so good. Now comes the interesting bit.

>>> import pickle
>>> m2 = pickle.loads(pickle.dumps(m))
>>> m2
<_ast.Module object at 0xb7651c0c>
>>> compile(m2, '<string>', 'exec')
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
  File "<string>", line 1
SyntaxError: from __future__ imports must occur at the beginning of the file

>>> import pickle

>>> m2 = pickle.loads(pickle.dumps(m))

>>> m2

<_ast.Module object at 0xb7651c0c>

>>> compile(m2, '<string>', 'exec')

Traceback (most recent call last):

File "<stdin>", line 1, in <module>

File "<string>", line 1

SyntaxError: from __future__ imports must occur at the beginning of the file

When you parse an AST with a __future__ import, it looks as if it stores some hidden flags that suppress this error. These flags, if they exist, are … Continue reading →

Posted in short | Tagged mystery, parsing, python | 12 Comments

Twisted + Pygame the Easy Way

Posted on Monday 20 February 2012 by J. D. Bartlett

I’ve put together a Python package called fibre. It provides helpers to make it easy to write asynchronous applications. It uses Twisted under the hood. I’ve also made a package called fibre.ui. It adds user interface support using pygame. One … Continue reading →

Posted in midlength | Tagged framework, programming, pygame, python, twisted | Comments Off

Subclass ’em Functions

Posted on Monday 13 February 2012 by J. D. Bartlett

Quick Summary I’ve got a simple Python helper class, in the talljosh package, that lets you write things that behave as functions but can be extended by subclassing. But Why? Consider the following Python function, found in json/encoder.py in the … Continue reading →

Posted in midlength | Tagged programming, python, tips, tools | 1 Comment

Again: Broadcom Wireless BCM43224, Ubuntu

Posted on Monday 6 February 2012 by J. D. Bartlett

Update 2013-02-27: This solution on Ask Ubuntu is much better, because it includes properly packaged things that should update when you upgrade Ubuntu. Update 2012-10-24: The patch is no longer available on Broadcom’s website, but it can be found here. … Continue reading →

Posted in short | Tagged broadcom, tips, troubleshooting, ubuntu, wireless | 4 Comments

Author Archives: J. D. Bartlett

Happy Birthday Sqizit!

Something Fishy with Python ASTs

Twisted + Pygame the Easy Way

Subclass ’em Functions

Again: Broadcom Wireless BCM43224, Ubuntu

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