写这个主要是不想让自己老去找以前写过的旧代码，既劳心又劳力，还容易让人产生厌烦情绪。所以汇总一下都放在这边好了。
parse string into time object and calculate the interval (in seconds)
# 计算两个时间戳的差值import timefrom datetime import datetime
fmt = “%y-%m-%dt%h:%m:%s.%fz” #2016-02-18t12:22:22.123456ztime1_obj = datetime.strptime(time1, fmt)
time2_obj = datetime.strptime(time2, fmt)
time_interval = int(time.mktime(time2_obj.timetuple()) – time.mktime(time1_obj.timetuple()))
call shell command in python script
# python 和 shell 的结合在实际科研很有用
import subprocess
subprocess.call([“ls”, “-l”], cwd=”.”)
read xml from file_path
import xml.etree.el
ementtree as ettree = et.parse(“test.xml”)
root = tree.getroot()
# apply dom operations on root
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