>>>params={'s':'sv','a':'av','b':'bv'}
>>>params.keys()
['a', 's', 'b']
>>>params.values()
['av', 'sv', 'bv']
>>>params.items()
[('a', 'av'), ('s', 'sv'), ('b', 'bv')]
>>>[k for k,v in params.items()]
['a', 's', 'b']
>>>[v for k,v in params.items()]
['av', 'sv', 'bv']
>>>["%s=%s" % (k,v) for k,v in params.items()]
['a=av', 's=sv', 'b=bv']