zester Easier Python client libraries
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Python library Python api clients

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zester is a Python library that makes it easier to develop Python clients for websites without APIs.No lxml, no XPath, just javascript.Let's make a client library for Hacker News by saving the following code in a file named hnclient.py:from zester import MultipleClient, Attributeclass HNClient(MultipleClient): url = "http://news.ycombinator.com/" title = Attribute(selector="$('.title a')", modifier="$(el).html()") link = Attribute(selector="$('.title a')"), modifier="$(el).attr('href')") points = Attribute(selector="$('.subtext span')", modifier="$(el).html().replace(' points', '')")Now, let's use the client we just made. Open a python shell:>>> from hnclient import HNClient>>> client = HNClient()>>> stories = client.process()>>> storiesHNClientResponse(points=u'200', link=u'http://daltoncaldwell.com/what-twitter-could-have-been', title=u'What Twitter could have been')>>> print stories.titleWhat Twitter could have been>>> print stories.linkhttp://daltoncaldwell.com/what-twitter-could-have-been>>> print stories.points56We subclassed MultipleClient there because we were planning on returning multiple results. If we wanted to make a client for something like Weather.gov that returned a single result, we could do something like this:from zester import SingleClient, Attributeclass WeatherClient(SingleClient): url = "http://forecast.weather.gov/MapClick.php?lat={lat}&lon={lng}" temperature = Attribute(selector="$('.myforecast-current-lrg').html()") humidity = Attribute(selector="$('.current-conditions-detail li').contents()") heat_index = Attribute(selector="$('.current-conditions-detail li').contents()") def __init__(self, lat, lng, *args, **kwargs): super(WeatherClient, self).__init__(*args, **kwargs) self.url = self.url.format(lat=lat, lng=lng)This also demonstrates how you can allow arguments to be taken:>>> from weather_client import WeatherClient>>> client = WeatherClient(lat=40.7143528, lng=-74.0059731)>>> curr_weather = client.process()>>> curr_weatherWeatherClientResponse(heat_index=u'82\xb0F (28\xb0C)', temperature=u'80\xb0F', humidity=u'58%')>>> print curr_weather.temperature80°F>>> print curr_weather.humidity58%>>> print curr_weather.heat_index82°F (28°C)InstallationZester is dependant upon Ghost.py. You must install it before installing Zester. Ghost.py will also require the installation of either PyQt or PySide.After Ghost.py is installed, to install zester: pip install zesterProduct's homepage

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