attribute_list = [
    'Finish': 'Chrome',
    'Size': 'Large',
    'Weight': '1.6kg',
    'Finish': 'Chrome',
    'Weight': '1.9kg'
]

compiled_list = [
    'Finish': 'Chrome',
    'Size': 'Large'
]

duplicates_list = [
    'Weight': '1.6kg',
    'Weight': '1.9kg'
]

compiled_list = list()
compiled_list_keys = list()
duplicates_list = list()
for attribute in attribute_list:
    for k, v in attribute.items():
        if k not in compiled_list_keys:
            compiled_list_keys.append(k)
            compiled_list.append(attribute)
        else:
            if attribute not in compiled_list:
                duplicates_list.append(attribute)
                compiled_list_keys.remove(k)