Posts tagged Python

Hacked on dotviewer that was developed for PyPy but is now a standalone tool. My changes are in a Bazaar branch created with bzr-svn. Get it here: bzr get https://mg.pov.lt/dotviewer-mg/ Try it out cd dotviewer-mg ./dotviewer.py sample2.dot See the changes bzr vis Overview: Supports more .dot features. Nicer node highlighting. Easier panning for one-mouse-button users (Shift+drag). Better edge navigation close to the borders of the graph.

Highlights from EuroPython 2008: Nice badges! Large, readable font, nice design, pretty logo, no clutter. Wifi worked great most of the time. Reportlab paragraph hyphenation is in a sorry state (nothing in the core, several extensions that sort of support it but are incomplete or hard to integrate); I should take a closer look at Dinu Gherman's work. I should take a closer look at Vudo. Phatch is cool.

This is a continuation of Python object graphs. import gc import inspect import types import weakref import os I've already mentioned gc and inspect. types and weakref help me distinguish certain kinds of objects. os is needed to spawn dot to generate an image from the textual graph description. def show_backrefs(objs, max_depth=3, extra_ignore=(), filter=None, too_many=10): This function starts from a given object (or a list of objects) and follows the reference chains backwards, up to a given maximal depth.

My post on hunting memory leaks in Python received a lot of feedback via email. And both^H^H^H^H most of them asked for the source code. Aside: if someone could recommend a good spam-proof comments plugin for PyBlosxom, I'd be very grateful. I see six plugins on the main site and it's unclear which combination is the one I need. So, here's the mysterious checks module I used in the post.

At work the functional test suite of our application used up quite a lot of RAM (over 500 megs). For a long time it was cheaper to buy the developers an extra gig of RAM than to spend time hunting down a possible memory leak, but finally curiosity overcame me and I started investigating. Warning: long post ahead. With pictures. Running a subset of the tests in a loop quickly proved that the memory leak is real: