Python 常用代码示例

本篇博客记录些在 Python 开发中经常会用到的代码，下次使用时就可以直接愉快地复制粘贴了。

常用代码

1、时间戳

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import time

time.strftime('%Y-%m-%d %H:%M:%S', time.localtime(time.time()))

2、pycharm 代码模板（Editor -> Code Style -> File and Code Template）

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#!/usr/bin/env python
# -*- coding: utf-8 -*-
# author: ${USER}
# date: ${DATE}
# description:

3、日志

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import logging as log

log.basicConfig(level=log.INFO,
                datefmt='%Y/%m/%d %H:%M:%S',
                format='%(asctime)s - %(filename)s[line:%(lineno)d] - %(levelname)s: %(message)s')

4、检查文件变动

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import inotify.adapters
import os

def main():
    i = inotify.adapters.Inotify()
    dir_name = os.getenv('DIR_NAME', '/etc/envoy/')
    i.add_watch(dir_name)

    os.chdir(dir_name)
    # CREATE event for a directory:
    os.system('mkdir foo')
    # CREATE event for a file:
    os.system('echo hello > test.txt')
    # MODIFY event for the file:
    os.system('echo world >> test.txt')

    for event in i.event_gen(yield_nones=False):
        (_, type_names, path, filename) = event
        if 'IN_CREATE' in type_names:
            print('the new configuration file is created.')
        if 'IN_ISDIR' in type_names:
            print('the new directory is created.')

if __name__ == '__main__':
    main()

5、性能分析

1）使用 cProfile 进行性能分析

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python -m cProfile abc.py

2）使用 line_profile 进行性能分析在待检测的函数上面添加 @profile 装饰器

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@profile   # 不用管此处的提示 "unresolved reference 'profile'"
def func1():
    sum = 0
    for i in range(100000):
        sum += i

运行该脚本

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kernprof -l -v xdhuxc.py

参考资料

https://segmentfault.com/a/1190000007518598

Python 常用代码示例

常用代码

参考资料

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