问题1：NameError: name 'sys' is not defined
解决方法： 在代码上加入 import sys
问题2：
Traceback (most recent call last):
File "<stdin>", line 1, in <module>
TypeError: a float is required
时间戳转换过程中报错：
>>> endtime= "1438768777102"
>>> period = endtime[:-3]
>>> print period
1438768777
>>> timeArray = time.localtime(period)
Traceback (most recent call last):
File "<stdin>", line 1, in <module>
TypeError: a float is required
>>> period = int(period)
>>> timeArray = time.localtime(period)
>>> period = time.strftime("%Y-%m-%d %H:%M:%S", timeArray)
>>> print period
2015-08-05 17:59:37
把字符串转换成int行，就报错了