Q: Why do I get an "ORA-01400: Cannot insert NULL into column name" when inserting a blank string?
A: This is a known Oracle issue. When inserting or updating a value for a varchar2, if you try to insert an empty string (""), Oracle interprets the value as NULL. If there is a NOT NULL restriction on the column in which you are inserting the value, the database throws the ORA-01400 error.
Moppelkotze
Divmod.Org :: Home :: Projects :: Quotient - Python messaging server based on Twisted
Emmanuel Renieris's Software Page - Python interface to agraph from GraphViz
gnutellavision: intro - Radial layout of graphs
MacNQC - Lego Compiler for OS X and Classic OS
mfGraph Library Homepage - Windows Python module for reading GraphViz Dot files
Parser-SIG - SIG on Parser Generation for Python - Liste von Parser Generatoren für Python
pyparsing -- a class library for text processing in Python - Interessante Klassenbibliothek für Parser in Python
Scalable Vector Graphics (SVG) 1.1 Specification - Vector graphics on the web - Specification
WAVE 3.0 - Web Accessibility Versatile Evaluator - Useful accessibility tester
Because I'm currently dealing with GPL-FUD in a discussion again, here's the appropriate link to an explanation of why GPL is not a viral license with contractual character, but simply one thing: a license for the use of source code.
Incorrect use of GPL source does not automatically make the new project GPL as well. The reverse path is indeed correct: if you want to use GPL software as an integral component, then your project must also be under GPL. But that effect works in exactly only this direction. Incorrect use of GPL source at worst only leads to one thing: the withdrawal of the license to use that source. So the project simply has to do exactly what it should have done anyway: write the corresponding part itself.
Equally absurd is the claim that you give up your rights to your source code when you contribute it to a GPL project. Of course you retain all rights to your own source code. My experience with arguments of this direction: I'm not contributing to the project because it's under GPL and therefore I can't freely use my own source code anymore are just lazy excuses for what is actually the case: I'm not contributing to the project because I can't freely use your source code for my other projects because my projects shouldn't be GPL. And that's something entirely different - nobody takes away your rights to your own source code (unless you explicitly give them up - in the context of official GNU projects it's customary to transfer rights to the FSF). But you don't automatically gain rights to other source code just because you contributed something yourself. And another thing: people who threaten that their great innovative ideas won't go into a project because it's under GPL usually don't have anything really innovative to deliver anyway. Actually, the number of innovative contributions to projects is minimal anyway - and strangely enough, the people who really deliver innovative parts have the least problems with the license...
Python: module inspect - Introspection for Python modules
PyTable RDBMS Middleware - Simplified work with database drivers in Python
RFC: Subscriptions harmonizer - Synchronization of blog rolls via XMLRPC
Welcome Page - Hierarchical database for Python and large data quantities
Writing PlugIns - How to analyze Cocoa applications and modify them after the fact
I like Trackback too. Even better would be if more people would include their trackback addresses in their RSS feeds using the trackback:ping tag, that would help avoid manual steps (and especially make this dreadful trackback autodiscovery unnecessary). The original article can be found at Der Schockwellenreiter here.
Version Control with Subversion - Book about Subversion - the successor to CVS
Omniorb Python Bindings - Documentation of the Python bindings for OmniORB
Fascinating. A story about how Apple discovered Hungarian notation (variable names with prepended characters for the variable type) by Charles Simonyi. Literally discovered — in the source code of the memory manager for Mac OS
Well, the reaction to the discovery speaks volumes: the source code was first purged of this defacement, then commented and documented, and then manually reimplemented in Assembler. Good old days...
asynchttp - Asynconronous HTTP Client - HTTP client that integrates with asynchat and thus does not block in Medusa
Device drivers in Haskell? Cool
I found the original article at Lambda the Ultimate.
ModelingObject-Relational Bridge for python - Framework for object-relational mapping of Python classes to SQL databases
3.3 weakref -- Weak references - How to create weak references with Python
my-zope - LocalFS-1-1-0.tgz - LocalFS for Zope 2.7 - the one on Source Forge is too old
Python Dispatch Package - Complex signal dispatcher for Python
XML-RPC Client/Server Protocol Reference - LiveJournal XML RPC API
While his languages are no longer relevant to my current work, they accompanied my education, professional activities, and private programming projects for many years. So, my hearty congratulations to Switzerland!
At heise online news you can find the original article.
del.icio.us API documentation - An API to access data from del.icio.us (social bookmarking service) and send new bookmarks
The Common Lisp Cookbook - Creation of an open book with Common Lisp code snippets
You've probably heard of Corba Bindings for Common Lisp. But here there's a whole Corba Implementation in Common Lisp.
PycURL Home Page - Python Wrapper for libcurl
shwebyhshandler.py - Handler for Medusa that supports gzip transfer encoding
RFC 1864 (rfc1864) - The Content-MD5 Header Field - Securing content against loss using MD5
Wow. A Python implementation in Scheme. Ok, the standard library is still missing (and that's really what makes Python so interesting), but anyway, it would then be the fourth Python environment (one for Java, one for .NET and of course the original CPython environment).
I found the original article at Lambda the Ultimate.
RFC 2445 - vCalendar - Definition of the vCalendar format
If you want to set up a SOAP web service in Python and don't want to use a monster server like twisted, but instead prefer a small, lean web server based on Medusa (though with dynamic multithreading!), you can check out my linked project. Nothing groundbreaking, but quite useful as an all-rounder. UPDATE: the stable version is now 0.2.0 and includes XML-RPC support in addition to SOAP. Version 0.3.0 is now in CVS, which adds support for implementing REST APIs.
DevChannel | The Affero GPL: Closing the Distribution Loophole - License specifically for web services - Network operation is equated with distribution
Now CMUCL also runs under OS X - and thus another Common Lisp is available.
At lemonodor you can find the original article.
PEP 324 -- popen5 - New POSIX process module - Python extension for easy integration of external processes
GraphPath Language - Query language for analyzing graphs
A Retrospective on PAIP - Peter Norvig reflects on where Lisp stands today
André Simon - Startseite - Tool for the shell to colorize by syntax
Continuations Made Simple and Illustrated - Continuations in Python
PEP 327 -- Decimal Data Type - Decimal numbers in Python - Proposal for a Python extension
Python for Lisp Programmers - Python from the perspective of a Lisp programmer
pyXLWriter - Generate Excel files with Python
SourceForge.net: Project Info - bytecodehacks - The Bytecodehacks for Python.