python_datafram兩列拼接，中間加上特殊字元

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()

#日期中間用橫線拼接，有事拼接不成功，可能是由于類型不一樣
#注意這裡所有的時間格式都已經是'str'格式
print(t7)
t7['date_received_date'] = t7.Date_received.astype('str')+'-'+t7.dates