python 常用的函数

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 ''