April, 2010


12
Apr 10

Python and mod_wsgi on Mac OS X Snow Leopard (oy vey)

I’ve been dabbling with Python Turbogears in the last week. Turbogears is a great framework so far. My biggest like is the loose coupling, allowing you to choose the best component for the job. I’ll write a more detailed blog about the other RAD web development frameworks out there sometime this week, but my biggest dislike of say Rails, Django, and some others, is how they tie you into using their integrated components. You can of course hackishly disable their use/dependency, but not without losing many other features of the framework. In my experience, these type of frameworks are great at getting something up quickly, but they suck when it comes to long term scalability and growth, as you basically end up rewriting the framework to integrate other 3rd party or your own components to the point that it marginalizes the benefits of the framework.

I found out that building Python on a Mac (OS X Snow Leopard) is nearly impossible. You can definitely compile it, but I needed it compiled to work with mod_wsgi, and various modules. I also needed to compile mod_wsgi against a particular version of apache, which required me to compile python as a universal binary to support i386 and x86_64 architectures. That’s where it started to get painful. Snow Leopard is distributed with Python 2.6.1 and supports a 3-way architecture (ppc7400, i386, and x86_64), but the latest python release is 2.6.5, so I tried to compile it. I used a myriad of options…

./configure --prefix=/usr/local/python-2.6.5 \
--enable-framework=/usr/local/python-2.6.5/frameworks \
MACOSX_DEPLOYMENT_TARGET=10.6 \
--enable-universalsdk=/Developer/SDKs/MacOSX10.6.sdk \
--with-universal-archs=3-way

I also tried to use intel for –with-universal-archs. Both CCFLAGS and LDFLAGS were being set correctly in the Makefile. I even tried setting them explicitly, with no luck: Python’s executable was compiling in all architectures except 64-bit. I wasn’t able to find any references to any such issue anywhere in the user forums and/or on the web. Every reference I saw in compiling python in 64-bit, I tried, with no luck. Evidentally, the Python distributed with Snow Leopard was compiled using some special compile procedures by Apple due to the fact that some packages lack 64-bit compatibility. I couldn’t find any reference to this procedure, nor did I really want to engage is such activity. Come on Python folks, WTF??? Can you either provide compilation instructions, or distribute MacPython as a universal binary including x86_64?

I ended up resorting (unhappily) to using Snow Leopard’s distributed Python and Mac’s web-sharing apache. I compiled mod_wsgi with:

./configure --with-apxs=/usr/sbin/apxs \
--with-python=/System/Library/Frameworks/Python.framework/Versions/2.6/bin/python

and voila, we have a working mod_wsgi install. I really dislike the fact that I wasted days trying to get it to work with Python 2.6.5 and custom apache install, but at least I have something that works now and hopefully won’t slow me down any more.

I’m loving python, as I have sporadically for quite a while, but I’m really missing the JVM with its problem-free installs, jar/war archives, and things just working.


2
Apr 10

Agile dilemma

The time has come to truly retire the word agile. I like the word. I love the idea of agility. But I’m starting to dislike how it’s starting to constrain software development and how it’s endlessly used in software literature these days for the lack of anything else to talk about I guess.

What was supposed to be as phrased in the agile manifesto:

Individuals and interactions over processes and tools

has become infested with these non-developer type parasites who at any sign of anything having a chance of making mainstream, inject their bureaucratic venom into it forcing a self preservation act by most smart developers. That act is to run for the hills.

So what happens next? Well, its a never ending lifecycle. Agile will reincarnate as something very similar to where its origins once lie, but in smaller development circles, until it’s crippled again. This cycle will repeat indefinitely. This cycle is not only apparent in software development lifecycle methodologies, but also in programming languages, frameworks, etc…

Software development is as much art as it is science and engineering. I think when some hear engineering, they think bridge engineering or what today has almost become a ubiquitous term for anyone doing anything. In engineering a bridge, one can reproduce rather predictable set of results. In developing software, one can’t. Engineering is as American Engineers’ Council for Professional Development put it: The creative application of scientific principles to design… Creative is the keyword here. Not constrained by process the kills creativity. We as professionals should be able to discerns these things and stop applying absolutes to the creative process. Just because we have successfully applied processes in the manufacturing discipline, doesn’t mean that same processes or processes at all, can be applied to software engineering. Sorry folks, no software factories for you.

Useful precise estimation is a delusion, and the sooner we realize it, the faster we can get back to developing quality software. Process is disadvantageous. All designed to give the businesses a warm fuzzy feeling of certainty around something that’s not certain. So why are there some that can give good estimates? There are only two reasons. One is that they are lucky. No really, they are lucky at predicting the unpredictable. This happens, trust me. Just ask someone who has a financial advisor and trusts them to set up their financial investment portfolio. Do you trust your financial advisor? If you do, please read Fooled by Randomness and The Black Swan. Also, there is actually one other reason for good estimation. Sorry developers for exposing this to your managers. This reason is overestimation. Yes, you heard it right. You overestimate, then you finish your task early, but instead of looking good by marking it as done early, which will in turn screw up estimation reports at the end of the sprint by showing that you chronically overestimate, you choose not to and though find something else to do to kill time or start on another task in case that one turns out to be underestimated. At the end of the project, you have accumulated so much time, that your friends have to ignore you on facebook and un-follow you on twitter.

One might say it doesn’t matter, as long as the overall estimates are close. Well, whatever makes you sleep better at night. Just know, software estimation is not science, it’s gambling.

Ah, one other thing, mostly related to XP. My favorite topic, Pair Programming. Sorry folks, this one’s not really for me. There are many issues with it. First, it’s disruptive in the way I think and to my personal creative process (I’m sure it’s not just me either). When I think, I don’t want anyone interrupting my train of thought just because they have an idea. Great, but if your idea doesn’t pan out, my idea just got lost in the shuffle, thanks for the context switch partner. In any other field that requires critical thinking, people work alone a lot (maybe not all the time). Just ask all the researchers. They come up with their best ideas/research and when ready, share those with colleagues or other researchers. They don’t gather up in a room and participate in committee based research. That would never work. One might say it’s because they are egotists. That might be true, but that’s not necessarily a bad quality being that it drives them to outperform someone else. At the end of the day, most innovations come from these weird acting egotists.

In pair programming, we have to be on the same schedule. When my brain doesn’t click, I like to go for a walk or pace around the room to get me into the creative process again. A lot of my ideas come not when I’m sitting at the desk writing code. Now, do I have to coordinate that schedule with my pairing partner? Should we hold hands and skip together? What about if I want to use the bathroom or grab a cup of tea? Should I be conscious as to ensure our bathroom/tea schedules are in synch? Are you kidding me? What is this, grade school all over again or a software factory (laughably some actually like that term).

Well here it goes. I’m a software artist/developer. I write code because I love to, not only because someone’s paying me big bucks to do it. I get aroused by solution revelations and enjoy compliments when I solve hard problems before others, or that others couldn’t, or in a more elegant/concise way than others. Software development is a creative process. It brings with it the ability to create a masterpiece. It’s also a process that requires critical thinking, reflection, and most of all “quite”. Private offices are great, but sometimes not realistic depending on the company’s financial situation. The office doesn’t have to be private, as long as what ever your arrangement is, it’s quite enough and not distracting for you to do your work without having to context switch every 10 minutes to hear some rant going on around you and/or answer questions. There are time for questions, but not when you’re in the zone.

I’d like to see Michelangelo or da Vinci create masterpieces under the constraints of a process. Better yet, I’d love to see those two pair paint.

We all don’t think or work the same. We’re humans. The key to good software is to hire great smart developers that can hold their own. Keep the teams small. The rest will be worked out as a team not as a process. It’s about common sense and good people, not processes.