def Logical_drives():
    return { "Free Space": [ ([t[0].text for t in type], zip([e[0].text for e in free] ,[f[0].text for f in total]) )
                                                for free, total, type in [
                                                    ([child.findall('Free_bytes') for child in x.findall('Drive')],
                                                    [child.findall('Total_bytes') for child in x.findall('Drive')],
                                                    [child.findall('Drive_type') for child in x.findall('Drive')])
                                                                ]
                                                ]}

unmarshaler = {
    "Logical_drives": Logical_drives
}