Dave Dash2012-04-07T22:42:44-07:00http://davedash.com/Dave Dashdd+atom1@davedash.comPython Generators2009-04-08T00:00:00-07:00http://davedash.com/2009/04/08/python-generators<p>Someone had mentioned "generators" in python to me, so I decided to figure out what it was... and I figured it out. I think a simple example would help explain it:</p>
<div><textarea name="code" class="python">
>>> def fib():
... i1 = 0
... i2 = 1
... while True:
... yield i2
... i3 = i2 + i1
... i1 = i2
... i2 = i3
...
>>> a = fib()
>>> a
<generator object at 0x319468>
>>> a.next()
1
>>> a.next()
1
>>> a.next()
2
>>> a.next()
3
>>> a.next()
5
</textarea></div>
<p>Basically you can iterate over this "generator" which is a special function that "yield"s more than one value if you keep pinging it.</p>
<p>Adding this to the toolkit in my brain. I'm thinking one potential use is taking a resultset from a datastore (e.g. mysql) and converting it into an object.</p>