In [3]:
df = pd.read_pickle('uqt.pickle')
df.is_copy = False
df.dtypes
Out[3]:
query_date object
channel object
query object
email object
ymo datetime64[ns]
dtype: object
In [6]:
df.iloc[1]['query_date']
Out[6]:
u'2013-01-02 04:28:02'
object只是u''的简写，或者数据框实际上知道它有一个（unicode）字符串吗？
pandas==0.16.2