windfinder.py

from json import loads as json_loads
import requests
import time

class Windfinder(object):
    def __init__(self):
        self.cache = {}
        self.threshold = 3 * 60

    def get_uncached(self, location):
        url = "https://www.windfinder.com/forecast/{}".format(location)
        response = requests.get(url)
        linegen = (x for x in response.content.split("\n"))
        for line in linegen:
            if "spotheader:" in line:
                break
        parsed = {}
        for line in linegen:
            if '</script>' in line:
                break
            line = line.strip(' ,{}')
            key, _, val = line.partition(':')
            key = key.strip()
            val = val.strip()
            if key and val:
                try:
                    val = json_loads(val)
                except:
                    pass
                parsed[key] = val
        return parsed

    def get_data(self, location):
        last_fetch_and_data = self.cache.get(location, (0, None))
        last_fetch, data = last_fetch_and_data
        if self.threshold < time.time() - last_fetch:
            data = self.get_uncached(location)
            self.cache[location] = time.time(), data
        return data

    def get_windspeed(self, location):
        return int(round(1.15 * self.get_data(location)['ws']))

def main():
    helper = Windfinder()
    for _ in xrange(50):
        print helper.get_windspeed('charles_river_basin')

if "__main__" == __name__:
    main()