Tag Archives: python

How to Run Flask Applications with Nginx Using Gunicorn

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We have recently bought a VPS for İTÜ24, the online newsletter of Istanbul Technical University. The server is running on Ubuntu Server 12.04 operating system. Due to limited memory resources and performance concerns, we preferred to setup nginx as web server.

Our server will serve several web pages and applications developed in various programming languages, such as PHP, Python, Ruby (on Rails). Currently, we have one Python application, which is using Flask framework.

How we run Flask application with nginx, step by step…
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WikiLeaks Cablegate Count v2

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Since the official WikiLeaks page has changed, the previous script needs to be updated. Here it is:

import urllib, piksemel, re

wleaks = int(re.search(r"(d+) / [0-9,]+", piksemel.parseString(urllib.urlopen("http://www.wikileaks.ch/cablegate.html").read()).getTag("body").getTag("div").getTag("div").getTag("a").nextTag().getTag("p").toString()).groups()[0])

Please remember to install piksemel module.

Show forecast using Yahoo! Weather

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Note: This snippet uses piksemel module to parse XML files. If you don’t have it, read this article to install it.

First of all, you need the WOEID (Where on Earth Identification) of the city. In order to learn it, go to http://weather.yahoo.com and search for the city. You’ll find the WOEID at the end of the url of the page.

# for Istanbul, TR
woeid = 2344116

Use this id in Yahoo! Weather API url, for w parameter.

weatherUri = "http://weather.yahooapis.com/forecastrss?w=%d" % woeid

If you want the results to be in metric units, add u=c parameter into your query.

weatherUri = "http://weather.yahooapis.com/forecastrss?w=%d&u=c" % woeid

Using urllib, fetch the XML file:

import urllib

xml = urllib.urlopen(weatherUri).read()

We can parse this XML easily using piksemel:

import piksemel

temp = piksemel.parseString(xml).getTag('channel').getTag('item').getTag('yweather:condition').getAttribute('temp')

You can also view XML file and look for other resources such as: humidity, visibility, wind, etc.

yatp: yet another transfer protocol

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In the beginning of March, I started to a new project with my room-mate Diego.

The main problem is sharing. We shouldn’t be sending e-mails to our friends to share a link, a document file, a presentation or some pictures. We shouldn’t try to memorize a TinyURL to tell a friend. Instant messengers? Eww! We hate those, who doesn’t?

Instant messengers are often useful. However there are many alternatives. Most of them requires you to be online to receive messages, and your online status will be public to your contacts. Most of them uses more then 30 MB of your computer memory. You cannot use them in a network which has no internet connection. Lots of disadvantages.

There’s also no easy way to share files. Websites providing file sharing services make you to much, enter a CAPTCHA image, then wait again. You cannot share a file even if you’re in the same network. OS differences, lack of configuration, bugs, security holes…

We are planning to create a new service based on HTTP to simplify sharing things between friends, especially whose computers are in the same network. We called it yatp, yet another transfer protocol, even it’s not a protocol. We did some brainstorming and created a website. More details will be announced later. And do not forget to visit: yatp.net

Sharing will be fun.