[Python] Python dictonary convert keys to values and vice versa

I need to convert keys to values and values to key.. i am using python 2.7 version... if there is any better approach then this let me know

source_info=\
{'benz': 'car',
'audi': 'car',
'bmw': 'car',
'toyata': 'car',
'ferrai': 'car',
'ducati': 'bike',
'suzki': 'bike',
'yamaha': 'bike'
}

def format_data(source_info=None):
# {} converting to set
id_unique = {source_info[key_id] for key_id in source_info}
result_dict = {}
# Result data from seq_def with searching for key with algos
for key in id_unique:
vechile_name = {k: v for k, v in source_info.items() if v in [key]}
result_dict[key] = list(vechile_name.keys())
return result_dict

result = format_data(source_info)
print(result)


I'm using the above code to get my job done.. but wanted to know if there is any better approach then this ?

result looks like this:

{'bike': ['ducati', 'suzki', 'yamaha'], 'car': ['benz', 'audi', 'bmw', 'toyata', 'ferrai']}


Highly appreciate your inputs here...

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