python？求大神指点？

[{u'1': 1520150369315, u'0': u'm.baidu.com', u'3': 182, u'2': 2, u'4': u'220.181.7.233,220.181.7.234'}, {u'1': 1520150369498, u'0': u'm.baidu.com', u'3': 170, u'2': 2, u'4': u'220.181.7.234,220.181.7.233'}, {u'1':1520150369669, u'0': u'www.pps.tv', u'3': 205, u'2': 2,u'4':u'106.120.177.175,106.120.177.176,106.120.177.177,106.120.177.178,220.181.184.118,220.181.184.188,106.120.177.173,106.120.177.174'}]
像这种的怎么提取出来所有u'3' 的值呢