python_datafram两列拼接，中间加上特殊字符

t10['temp'] = t10['date'].apply(lambda x: x+ ':')
t10['temp'].head()
t10['user_date_datereceived_gap'] = t10['temp'] + t10['date_received']
t10['user_date_datereceived_gap'].head()

#方法二：
t10['user_date_datereceived_gap']=t10.apply(lambda x: x['date']+ ':'+ x['date'],axis=1)
t10['user_date_datereceived_gap'].head()

#日期中间用横线拼接，有事拼接不成功，可能是由于类型不一样
#注意这里所有的时间格式都已经是'str'格式
print(t7)
t7['date_received_date'] = t7.Date_received.astype('str')+'-'+t7.dates