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PI PROJECTS: Weather App

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What is it?

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This project combines a Python Parser and Weather information pulled down from Yahoo Weather page.  A Parser is the process of analysing a string of symbols.

Python Weather App - Looping

Weather App writing to Text File

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Install the Parser Module

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In the LX Terminal :

Update your Pi     
Sudo apt-get update

Upgrade your Pi    
Sudo apt-get upgrade

Search for the python Parser in the repositories, 
Sudo apt-cache search feed parser

Install the Parser
sudo apt-get install python-feedparser

How To:

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First go to the Yahoo Weather Website and enter the location where you want to draw the weather data from, eg London.

Yahoo Weather

In the address bar there will be a 5 digit number that denotes the ID of the location, for example London is http://uk.weather.yahoo.com/united-kingdom/england/london-44418/, ID number 44418, you will need the ID number for your own location. 

The basic code function is 
rss_link ='http://weather.yahooapis.com/forecastrss?w=44418u=c'
where the temperature is return in either 'c' Celsius or 'f' Fahrenheit then add the code 
d = feedparser.parse(rss_link)

Next use the Parser to pull down the required data, this is stored in categories which are listed at the Yahoo developer site. For example, 
atmosphere = d.feed.yweather_atmosphere 

This pulls down  the related related data from the atmosphere category  from this the humidity value can be selected and stored, 
humidity = atmosphere['humidity']

Then use the print function to display the data
print "Humidity for "+city, humidity

Program examples for London Weather:
Program 1 -Original program with looping feature
Program 2 - Weather data is written to a text file called weather_summary

Further development details can be found at Yahoo Developer