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Metview's Python interface also provides a more object-oriented way of using the wrapper classes such as Fieldset. The following two snippets of code are equivalent:

FunctionObject method

# find the locations where t is > 310K

t = mv.retrieve(param = 't', grid = [1,1])
hot = t > 310
locs = find(hot, 1)

# find the locations where t is > 310K

t = mv.retrieve(param = 't', grid = [1,1])
hot = t > 310
locs = hot.find(1)