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CHAPTER 1 INTRODUCTION TO CLIENT/SERVER NETWORKING
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Careful Python programmers do not suffer from this situation any longer. Many of us install only one Python package system-wide: virtualenv. Once virtualenv is installed, you have the power to create any number of small, self-contained virtual Python environments where packages can be installed, un-installed, and experimented with without contaminating your system-wide Python. When a particular project or experiment is over, you simply remove its virtual environment directory, and your system is clean. In this case, we want to create a virtual environment in which to test the googlemaps package. If you have never installed virtualenv on your system before, visit this URL to download and install it: http://pypi.python.org/pypi/virtualenv Once you have virtualenv installed, you can create a new environment like this (on Windows, the directory containing the Python binary in the virtual environment will be named Scripts instead): $ virtualenv --no-site-packages gmapenv $ cd gmapenv $ ls bin/ include/ lib/ $ . bin/activate $ python -c 'import googlemaps' Traceback (most recent call last): File "<string>", line 1, in <module> ImportError: No module named googlemaps As you can see, the googlemaps package is not yet available! To install it, use the pip command that is inside your virtualenv and that is now on your path thanks to the activate command that you ran: $ pip install googlemaps Downloading/unpacking googlemaps Downloading googlemaps-1.0.2.tar.gz (60Kb): 60Kb downloaded Running setup.py egg_info for package googlemaps Installing collected packages: googlemaps Running setup.py install for googlemaps Successfully installed googlemaps Cleaning up... The python binary inside the virtualenv will now have the googlemaps package available: $ python -c 'import googlemaps' Now that you have the googlemaps package installed, you should be able to run the simple program named search1.py. Listing 1 1. Fetching a Longitude and Latitude #!/usr/bin/env python # Foundations of Python Network Programming - 1 - search1.py from googlemaps import GoogleMaps address = '207 N. Defiance St, Archbold, OH' print GoogleMaps().address_to_latlng(address) Running it at the command line, you should see a result like this: $ python search1.py (41.5228242, -84.3063479)
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CHAPTER 1 INTRODUCTION TO CLIENT/SERVER NETWORKING
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And there, right on your computer screen, is the answer to our question about the address s latitude and longitude! The answer has been pulled directly from Google web service. Our first example program is a rousing success. Are you annoyed to have opened a book on Python network programming, only to have found yourself immediately directed to download and install an obscure package that turned what might have been an interesting network program into a boring three-line Python script Be at peace! Ninety percent of the time, you will find that this is exactly how programming problems are solved: by finding other programmers in the Python community that have already tackled the problem you are facing, and building intelligently and briefly upon their solutions. But, we are not yet done exploring our example. You have seen that a complex network service can often be accessed quite trivially. But what is behind the pretty googlemaps interface How does the service actually work We will now explore, in detail, how the sophisticated Google Maps service is actually just the top layer of a network stack that involves at least a half-dozen different levels.
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Our first program listing used a third-party Python library, downloaded from the Python Package Index, to solve our problem. What if that library did not exist What if we had to build a client for Google s Maps API on our own For the answer, take a look at search2.py. Listing 1 2. Fetching a JSON Document from the Google Maps URL #!/usr/bin/env python # Foundations of Python Network Programming - 1 - search2.py import urllib, urllib2 try: import json except ImportError: # for Python 2.5 import simplejson as json params = {'q': '207 N. Defiance St, Archbold, OH', 'output': 'json', 'oe': 'utf8'} url = 'http://maps.google.com/maps/geo ' + urllib.urlencode(params) rawreply = urllib2.urlopen(url).read() reply = json.loads(rawreply) print reply['Placemark'][0]['Point']['coordinates'][:-1] Running this Python program returns an answer quite similar to that of our first script: $ python search2.py [-84.3063479, 41.5228242] Well, okay, the output is not exactly the same we can see, for example, that the JSON protocol does not distinguish between a tuple and a list, and also that Google sends back the longitude and latitude in the opposite order from the one that the googlemaps module liked to expose. But, it is clear that this script has accomplished much the same thing as the first one. In search2.py, we have stepped one rung down the ladder, and instead of using any third-party packages at all, we are calling routines from Python s built-in Standard Library. This code, it happens, will work only on Python 2.6 or above unless you use pip to install the third-party simplejson package. The first thing that you will notice about this code is that the semantics offered by the higher-level googlemaps module are absent. Unless you look very closely at this code, you might not even see that it s
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