key in d怎么用
>>> d = dict(vcode='Get_vcode', date='Get_vdate')
>>> print d
{'date': 'Get_vdate', 'vcode': 'Get_vcode'}
>>> print d
{'date': 'Get_vdate', 'vcode': 'Get_vcode'}
>>> 'vcode' in d.keys()
True
>>> 'v' in d.keys()
False
True
>>> 'v' in d.keys()
False
