python timestamp和datetime之间的转换

1. 字符串日期时间转换成时间戳

# '2015-08-28 16:43:37.283' --> 1440751417.283  # 或者 '2015-08-28 16:43:37' --> 1440751417.0  def string2timestamp(strValue):        try:                  d = datetime.datetime.strptime(strValue, "%Y-%m-%d %H:%M:%S.%f")          t = d.timetuple()          timeStamp = int(time.mktime(t))          timeStamp = float(str(timeStamp) + str("%06d" % d.microsecond))/1000000          print timeStamp          return timeStamp      except ValueError as e:          print e          d = datetime.datetime.strptime(str2, "%Y-%m-%d %H:%M:%S")          t = d.timetuple()          timeStamp = int(time.mktime(t))          timeStamp = float(str(timeStamp) + str("%06d" % d.microsecond))/1000000          print timeStamp          return timeStamp

2.时间戳转换成字符串日期时间

# 1440751417.283 --> '2015-08-28 16:43:37.283'  def timestamp2string(timeStamp):      try:          d = datetime.datetime.fromtimestamp(timeStamp)          str1 = d.strftime("%Y-%m-%d %H:%M:%S.%f")          # 2015-08-28 16:43:37.283000'          return str1      except Exception as e:          print e          return ''