Experience with sqlalchemy from_self
I was playing around with a change yesterday hoping to optimize out an extra database round trip. I thought I could accomplish it without having to change the structure of the code at all just by...
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Vasudev Ram: Func-y D + Python pipeline to generate PDF
By Vasudev Ram Hi, readers, Here is a pipeline that generates some output from a D ( language ) program and passes it to a python program that converts that output to PDF . The D program makes use of...
View Articlepython征程1.1（初识python）
在学习python前必须要掌握的一些基本知识 1.编程语言 2.python 、 C# JAVA 3.python: pypy cpython jpython 4.执行方式 解释器 文件执行 5.指定解释器 python xxx.py ./xxx.py #! /usr/bin/env python ascii unicode utf-8 python 2.7 # -*- coding=utf-8...
View ArticleUsing get() to return a default value from a Python dict
Imagine we have the following data structure mapping user IDs to user names: name_for_userid = { 382: "Alice", 950: "Bob", 590: "Dilbert", } Now we’d like to write a function greeting() which returns a...
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Python HTTP下载文件并显示下载进度条
下面的python脚本中利用request下载文件并写入到文件系统，利用progressbar模块显示下载进度条。 其中利用request模块下载文件可以直接下载，不需要使用open方法，例如： import urllib import requests.packages.urllib3 requests.packages.urllib3.disable_warnings() url =...
View Articlepython高级property详解
python中有一个被称为 属性函数(property) 的小概念，它可以做一些有用的事情。在这篇文章中，我们将看到如何能做以下几点： 将类方法转换为只读属性 重新实现一个属性的setter和getter方法 在本文中，您将学习如何以几种不同的方式来使用内置的 属性 函数。希望读到文章的末尾时，你能看到它是多么有用。 开始...
View Article#! /usr/bin/env considered harmful
Many programming guides recommend to begin scripts with the #! /usr/bin/env shebang in order to to automatically locate the necessary interpreter. For example, for a python script you would use #!...
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如何用python优雅的科学上网
怎么叫做优雅呢？ 个人看法：应该是简单，可重复的，通用跨平台，以及步骤不会超过三步。 开始看了一篇关于openshift的科学上网文章，太繁琐了而且不够通用。 在么通用呢？shadowsocks!!!因为SS是跨平台的，电脑手机客户端都有。 下载地址： https://shadowsocks.org/en/download/clients.html 好吧，进入主题。...
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Python在Windows下开发环境配置汇总
python在windows下开发环境配置汇总 51分钟前来源：cnblogs 下面将我在配置Windows环境下的禁言写出来，与大家分享。 1.下载与安装Python 1.Python官方网址：https://www.python.org php?url=0ERiVcIvZ1" alt="Python在Windows下开发环境配置汇总"...
View Article哲学家就餐问题与死锁
问题描述 哲学家就餐问题（Dining philosophers problem）是在计算机科学中的一个经典问题，用来演示在并发计算中多线程同步（Synchronization）时产生的问题。 哲学家就餐问题可以这样表述：五位哲学家围绕一个圆桌就坐,桌上摆着五 支...
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numpy：python数据领域的功臣
前言 numpy对python的意义非凡，在数据分析与机器学习领域为python立下了汗马功劳。现在用python搞数据分析或机器学习经常使用的pandas、matplotlib、sklearn等库，都需要基于numpy构建。毫不夸张地说，没有numpy，python今天在数据分析与机器学习领域只能是捉襟见肘。 什么是一门好的数据分析语言...
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Go Newsletter Issue #127
Proposal: Add ACME (LetsEncrypt, etc.) Support to net/http news Core team member Brad Fitzpatrick wants HTTP support to be ‘dead simple out of the box’ with Go. Give the idea your thumbs up if you...
View ArticleWriting Microservices: An Example Through a Simple To-Do Application
Microservices are becoming a new trend, thanks to the modularity and granularity they provide on top of advantages like releasing applications in a continuous manner. There are various platforms and...
View ArticlePythonic拾趣
Beautiful is better than ugly. by Tim Peters 以下是本人在学习python过程中总结的一些Python实践、技巧、思路。此文档将不断更新。 迭代器实现 class Reverse(object): def __init__(self, data): self.data = data self.index = len(data) def...
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PyCharm: Python Developers Survey 2016: Findings
Recently we conducted a survey among more than 1,000 python developers to identify the latest trends and gain insight into how the Python development world looks today. We’re excited to share some of...
View ArticleTrain your own WaveNet: Keras Implementation with sampling
WaveNet implementation in Keras Based on https://deepmind.com/blog/wavenet-generative-model-raw-audio/ and https://arxiv.org/pdf/1609.03499.pdf . Disclaimer: this is a re-implementation of the model...
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Debugging Django Management Commands in PyCharm
Photo by Jill Heyer My favorite editor for python projects is PyCharm. Besides editing code , it allows you to inspect the database, work with Git repositories, run management commands, execute bash...
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Controlling a ESP8266 H801 Wifi controller through Python
These controllers can be bought for about ~$10 from Aliexpress which makes it possible to light an entire room with LEDs for about ~$20 if you wish. Controlling them is pretty easy too, besides the...
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x lines of Python: synthetic wedge model
Welcome to a new blog series! Like theA to Z and theGreat Geohpysicists, I expect it will be sporadic and unpredictable, but I know you enjoys life's little nonlinearities as much as I. The idea with...
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Tune Learning Rate for Gradient Boosting with XGBoost in Python
A problem with gradient boosted decision trees is that they are quick to learn and overfit training data. One effective way to slow down learning in the gradient boosting model is to use a learning...
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