You can't iterate over a layer's features more than once without calling layer.ResetReading

[33d]

I just found this out the hard way. Maybe this can be noted in the "Iterate over features" section? (Great guide by the way, it's really helpful for getting started.)

[ranchodeluxe]

@33d,
Thanks for the comment. Go ahead and put a note in the feature iteration section and put in a pull request.

You might want to also add it to this section since it's relevant:
http://pcjericks.github.io/py-gdalogr-cookbook/gotchas.html