urlgrabber examples

Here, we present a number of examples on how to use urlgrabber. I (Michael) feel strongly that software should work in its most basic form right out of the box with little knowledge or expertise. Then, if you need to do more exotic things, you should be able to do that, too, although perhaps with a little reading. With that in mind, lets consider how you might use urlgrabber at first, and then you might take advantage of some of its features as needed.

Basic use

In its simplest form, urlgrabber can be a replacement for urllib2's open, or even python's file if you're just reading.
from urlgrabber import urlopen
fo = urlopen(url)
data = fo.read()
fo.close()
Here, the url can be http, https, ftp, or file. It's also pretty smart so if you just give it something like /tmp/foo or C:\bar, it will figure it out. For even more fun, you can also do:
from urlgrabber import urlopen
local_filename = urlgrab(url)  # grab a local copy of the file
data = urlread(url)            # just read the data into a string
Now, like urllib2, what's really happening here is that you're using a module-level object (called a grabber) that kindof serves as a default. That's just fine, but you might want to get your own private version for a couple of reasons. Therefore, you're probably better off making your own. This also gives you lots of flexibility for later, as you'll see.
from urlgrabber.grabber import URLGrabber
g = URLGrabber()
data = g.urlread(url)
This is nice because you can specify options when you create the grabber. For example, lets turn on simple reget mode so that if we have part of a file, we only need to fetch the rest.
from urlgrabber.grabber import URLGrabber
g = URLGrabber(reget='simple')
local_filename = g.urlgrab(url)
The available options are listed in the module documentation, and can usually be specified as a default at the grabber-level or as options to the method.
from urlgrabber.grabber import URLGrabber
g = URLGrabber(reget='simple')
local_filename = g.urlgrab(url, filename=None, reget=None)

Advanced use

More to come...