import time
data['timestamp'] = data['OCC_TIM'].apply(lambda x:time.mktime(time.strptime(x,'%Y-%m-%d %H:%M:%S')))

timestamp = 1.521708e+09
time_local = time.localtime(timestamp)
time_local
# 输出：
# time.struct_time(tm_year=2018, tm_mon=3, tm_mday=22, tm_hour=16, tm_min=40, tm_sec=0, tm_wday=3, tm_yday=81, tm_isdst=0)

time.strftime('%Y/%m/%d %H:%M:%S',time_local)
# 输出：
# '2018/03/22 16:40:00'

import time
data['timestamp'] = data['OCC_TIM'].apply(lambda x:time.mktime(x.timetuple())) # 所以最重要的是 日期.timetuple() 这个用法 通过它将日期转换成时间元组
data.head(10)
# 输出：