June 29, 2015

How to know what Endpoints any Werkzeug webapp Exposes

The code above lists your flask endpoints along with their handlers in json.

How to use heroku under NetBSD

I woke up at a loss, as the notes build was broken, I'd updated my checkouts and pushed the broken code, and the heroku toolbelt wasn't behaving. This was on all my systems, except for an old checkout I had on NetBSD. However, the heroku gem wouldn't install on it. But it was missing from jsplugin, so I added it in. And presto, it started to work!

June 14, 2015

How to Authenticate Users

The code below is a simple authentication system written in python (of course) and bottlepy. It also includes a few, simple unit-tests:

For now, it only supports one site, I'll probably add multiple site support in the near future.

May 27, 2015

How to Remix My Shared Links

I share a lot of links -- by email, I tweet their aggregate statistics, I provide them in json, RSS, and compressed csv. Tonight, I added the option of getting them as well-formed, simple xml for Ibrahim. The entire method is 15 lines and embedded below:

May 21, 2015

How to Resolve Zipcodes to Timezones

A friend emailed me in the middle of the night asking me if I knew of any simple method to resolve postal codes to timezones in the United States. Enter python and flask:

There may very well be a clever way to refactor the if statement, but this does work, so I can't be bothered.

May 17, 2015

How to Monitor Network Availability

My adventures with the Internet continue. I decided to get scientific about it though. So I've written a script (in python naturally) to log when the network is down. It does so, by invoking fping in an infinite loop and checking its return code for success, in which case the subprocess module will raise an exception. This exception is caught, the time is logged and the user needs to hit a key to continue. Eventually, I'll probably design a pretty plot, to get some insight as to when the network flakes.

May 11, 2015

How to Download and Save Flickr Images

A follow up from yesterday's post on locating the direct URL to any flickr photo. I've now added save capability to the current directory. As a final step, I think I'd like to set the desktop background to the downloaded photo automatically. That's for another day, though. With the new feature, the code is below:

How to Download Flickr Images

The code above will allow you to download images from flickr, even when the photographer has disabled the downloading of their images. Just send it the URL to the any of the image sizes as the "--url=" parameter. As usual, I'm open to suggestions regarding style and readability.

April 28, 2015

How to Track my Link Sharing

If one wants to know how many links I share in a given day, check my twitter feed around 4 in the morning GMT (that's 8pm Pacific time and noon in Hong Kong/Singapore). Source code for this lives below:

April 23, 2015

How to Implement One-Time Passwords Serverside

Kindly avail yourself of the following python code, which comprises the backend of a simple, one-time password system:
You'll need to install web.py and requests to use it.

April 17, 2015

How to get Out of a Recession

Those who know me know me to be a rather big supporter of the left-wing British MP George Galloway, because of his foreign policy work in the Middle East. This is a personal bias I have.

My economic views, however, are less personal and more scientifically justified. When any economic downturn hits, there are those in governments that say we need to collectively tighten our belts till we grow again and because we the people are the government, the government is included in this list This is what I would term the austerity lot. There are others, however, who feel that government must be the spender of last resort, thus expanding and making up for the slack in the rest of the economy -- the Keynesians. Which strategy does better?

To get an answer, we must define the terms -- what does better mean? Better in the sense of a shallower dip in aggregate economic growth as measured by GDP. Our three candidate countries -- posterboys for austerity, Germany, posterboys for ramping up government spending, China, and a third country that did something in between, the United States. The results are below, followed by the code used to generate the plot:

April 1, 2015

How to see my Shared Links

So, earlier this morning, I rewrote the links list. Future directions include using the document titles instead of the URLs and making the page prettier. The source code for the web application is below:

How to tell When the Next Caltrain is Leaving

Until I decide otherwise, I'm in south bay and am without a car. So, I'm reliant on Caltrain, whose website leaves much to be desired in the area of easy to access information. How do I know this? Well, if I get annoyed with the user experience, then you can be sure a majority of users are frustrated. However, the good people at caltrans do provide GTFS-compliant feeds, which are trivial to parse. Without further ado:

And a run of it: