import json

class ActionParameter(object):
    def __init__(self, key, value):
        self._key = key
        self._value = value

    def __str__(self):
        return u'{}: {}'.format(self._key, self._value)

    def toJsonA(self):
        return u'{{"key":"{}", "value":"{}"}}'.format(self._key, self._value)

    def toJsonB(self):
        return '{{"{}":"{}"}}'.format(self._key, self._value)


testJsonA = '{"key": "direction", "value": "up"}'
testJsonB = '{"direction": "up"}'

def createFromJSONA(JsonA):
    deserializedDict = json.loads(JsonA)
    return ActionParameter(deserializedDict['key'], deserializedDict['value'])

def createFromJSONB(JsonB):
    deserializedDict = json.loads(JsonB)
    return ActionParameter(deserializedDict.keys()[0], deserializedDict.values()[0])

if __name__ == '__main__':
    ap1 = createFromJSONA(testJsonA)
    ap2 = createFromJSONB(testJsonB)
    print(ap1)
    print(ap2)
    print(ap1.toJsonA())
    print(ap1.toJsonB())