[FWTools] Get extent from rasters

[Susana Iraiis Delgado Rodriguez]

Hello list!

I´m working in a python module to read rasters and get information out of
them. I'm using GDAL and some of the osgeo libraries. I already have the
ratsers' projection, but I also need its extent (x_min, y_min, x_max,
y_max).
I have been searching in google and don't have any results. My code is:

from osgeo import gdal
from osgeo.gdalconst import *

gdal.AllRegister()
dataset = gdal.Open(filepath, GA_ReadOnly)
if dataset:
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