create dictionary from a nested list
my_dict= 'mc': [[{'id': '1.185662381',
'marketDefinition': {'bspMarket': False,
'turnInPlayEnabled': True,
'persistenceEnabled': True,
'marketBaseRate': 5.0,
'eventId': '30729399',
'eventTypeId': '1',
'numberOfWinners': 1,
'bettingType': 'ODDS'}],
[{'id': '1.185662380',
'marketDefinition': {'bspMarket': True,
'turnInPlayEnabled': False,
'persistenceEnabled': True,
'marketBaseRate': 5.0,
'eventId': '30729399',
'eventTypeId': '1',
'numberOfWinners': 1,
'bettingType': 'ODDS'}]]