data = {(112762853378): {'dst': ['10.121.4.136'], 'src': ['1.2.3.4'],
    'alias': ['www.example.com']}, (112762853385): {'dst': ['10.121.4.136'],
    'src': ['1.2.3.4'], 'alias': ['www.example.com']}, (112760496444): {
    'dst': ['10.121.4.136'], 'src': ['1.2.3.4']}, (112760496502): {'dst': [
    '10.122.195.34'], 'src': ['4.3.2.1']}}
keep = set({repr(sorted(value.items())): key for key, value in data.
    items()}.values())
for key in list(data.keys()):
    if key not in keep:
        del data[key]
pprint.pprint(data)
Removing Duplicates From Dictionary