软件工程常用代码库 - Python 篇

软件工程惯用代码库 -- Python 篇

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 time
from datetime import datetime

fmt = "%Y-%m-%dT%H:%M:%S.%fZ" #2016-02-18T12:22:22.123456Z
time1_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.ElementTree as ET
tree = ET.parse("test.xml")
root = tree.getroot()
# apply dom operations on root