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import metview as mv

# read GRIB data containi gcontaining pressure levels and several dates/steps
f = mv.read("my.grib")

# define the set of levels
levels = [1000, 925, 850, 700, 500]

# compute the mean on each level and add it to the resulting fieldset (=res)
res = mv.Fieldset()
for lev in levels:
	g = mv.read(data=f, levelist=lev, levtype="pl")
	res.append(mv.mean(g))