python - Fiona: get each feature extent (bounds)

I was looking in Fiona to get for each feature its extent but I didn't find how.

I have try to far to do something like below

import fiona


with fiona.open('countries/ne_10m_admin_0_countries.shp', 'r') as source:
    for f in source:
        geom = f['geometry']
        print geom

I was expecting to get a method for this at the f variable level. After some documentation reading, I've seen that f is a pure python record. So at the end, how with Fiona can I get the extent (or bounding box) of each feature geometry?

PS: I already know the pure GDAL/OGR python solution so I expect a Fiona solution please

Answer

I'd do it like this:

def explode(coords):
    """Explode a GeoJSON geometry's coordinates object and yield coordinate tuples.
    As long as the input is conforming, the type of the geometry doesn't matter."""
    for e in coords:
        if isinstance(e, (float, int, long)):
            yield coords
            break
        else:
            for f in explode(e):
                yield f


def bbox(f):
    x, y = zip(*list(explode(f['geometry']['coordinates'])))
    return min(x), min(y), max(x), max(y)