Get timestamp from python

python_timestamp.py

import time;
ts = time.time()
print(ts)
# 1514116641.1691682
# 小数点后七位,也就是100ns

import datetime;
ts = datetime.datetime.now().timestamp()
print(ts)
# 1514116641.171174
# 小数点后六位,也就是1微秒, 1us

import calendar;
import time;
ts = calendar.timegm(time.gmtime())
print(ts)
# 整数表示的秒值