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New Lever language builds on Python's convenience, aims for PyPy speeds
Lever , a new open source programming language now in its 0.8.0 release, may be inspired by python, but it doesn't intend to be limited by it. Lever's mission is to be a general-purpose programming...
View ArticleInteresting Python Tutorials
Hi there folks! I have read some interesting python tutorials lately. I would love to share them with you. Without any further ado let me list them over here: 1. Composing Music With Recurrent Neural...
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How many ways can you tile a chessboard with dominoes?
Suppose you have an n by m chessboard. How many ways can you coverthe chessboard with dominoes? It turns out there’s a remarkable closed-form solution: Here are some questions you may have. But what...
View ArticleSome notes on building a conda recipe
I’ve spent the day building a conda recipe, the process wasn’t super-smooth, hopefully these notes will help others and/or maybe you can leave me a comment to improve my flow. The goal was to learn...
View ArticleSmart AnSwerS #75
Hey there community and welcome to the 75 th installment ofSmart AnSwerS. The “Where Will Your Karma Take You” contest officially ended this past Monday, and the winners were announced in aSplunk blog...
View ArticleDjango Tips #12 Disabling Migrations to Speed Up Unit Tests
The model migrations are certainly a great feature of the Django framework. But, when it comes down to running tests, it really slows down the process. Especially if your migration history is big. This...
View ArticleRegression in Python using R-style formula it’s easy!
I remember experimenting with doing regressions in python using R-style formulae a long time ago, and I remember it being a bit complicated. Luckily it’s become really easy now and I’ll show you just...
View Article让 pip 走代理
使用 python 的时候，经常需要下载一些第三方的框架，好在 python 也有类似 apt 的包管理工具，pip。 不过，pip 虽然能够管理包，却没有切换镜像源的功能，而我们下载的包，大多数都在国外大型的代码托管服务器上，这就导致了往往几百KB的包要下载一个小时。 这里我们假定，作为程序员的你，已经给电脑部署了 HTTPS 以及 HTTP 代理，我们之前也讲过， 如何给终端设置全局代理来让...
View ArticlePython入门一：基本数据类型
作为一个刚入门编程的大一狗，第一次写博客，希望能对自己学的知识进行巩固和提升，也希望记录自己成长的过程。 学习python，一是因为暑假学的c++头疼，听说Python简单，那我就试试吧，二是因为Python形势一片大好，算是附和潮流吧！ 一、初识Python 1、第一个Python代码 1 print("Hello World")依然是熟悉的Hello World，...
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PyCNN: Cellular Neural Networks Image Processing Python Library
PyCNN: Cellular Neural Networks Image Processing python Library Cellular Neural Networks (CNN)are a parallel computing paradigm similar to neural networks, with the difference that communication is...
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Python数据分析之pandas学习（一）
我们接着上次分享给大家的两篇文章： python数据分析之numpy学习（一） 和 Python数据分析之numpy学习（二） ，继续讨论使用Python中的pandas模块进行数据分。在接下来的两期pandas介绍中将学习到如下8块内容： 1、数据结构简介：DataFrame和Series 2、数据索引index 3、利用pandas查询数据 4、利用pandas的DataFrames进行统计分析...
View Article开发者和IT人士成为数据科学家的学习路线
开发者和IT人士成为数据科学家的学习路线 5小时前来源：数据分析网 摘要：这篇指南旨在帮助WEB开发者、软件工程师以及其他的IT从业者转行到数据分析/数据科学行业。...
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使用 Python 创建你自己的 Shell
使用 python 创建你自己的 Shell 3小时前来源：伊甸园开源社区 在上篇中，我们已经创建了一个 shell 主循环、切分了命令输入，以及通过 fork 和 exec 执行命令。在这部分，我们将会解决剩下的问题。首先，cd test_dir2 命令无法修改我们的当前目录。其次，我们仍无法优雅地从 shell 中退出。php?url=0EEVQmCfTd" alt="使用 Python...
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ReefScouts - Swarm Water Robotics
ReefScouts - Swarm Water Robotics Written by Harry Fairhead Saturday, 20 August 2016 This is fun to watch and thought provoking. Perhaps swarm-based robotics has something to offer after all. Watch as...
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python|bp神经网络|iris分类
写了几百年的神经网络终于写出来了。 主要遇到的几个坑点: 1.数据集里的y label必须在(0,1)间,如果你用了sigmoid作为激活函数 2.对于反向传播 S(L)=y-a(L) sigmoid函数 S(l)=w(l).S(l+1)*a(l)*(1-a(l)) sigmoid的导数 其实这里的坑点是,后面都是两两相乘,一开始用异或,输出都是1,就没注意到差别...
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rtnDataFlow Python scripts for creating streaming data flow processing pipeli...
The idea of joining together separate, lightweight processing elements to form complex pipelines is nothing new. DirectX and GStreamer have been doing this kind of thing for a long time. More...
View ArticlePython爬虫入门五之URLError异常处理
1. URLError 首先解释下URLError可能产生的原因： 网络无连接，即本机无法上网 连接不到特定的服务器 服务器不存在 在代码 URLError.py 中，我们需要用try-except语句来包围并捕获相应的异常。 #-*-coding:utf8-*- #created by 10412 import urllib2 request =...
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_compile(pattern, flags).findall(string) TypeError: cannot use a string pattern
最近在自学python，做的一个图片爬虫，却出现一些错误，特此总结下来，为了别人遇到同样错误时可以快速解决同样的问题。 #coding=utf-8 import urllib import urllib.request import re url = "http://tieba.baidu.com/p/2460150866" page = urllib.request.urlopen(url)...
View ArticlePython3基本数据类型
python中的变量不需要声明，每个变量使用前必须赋值，变量赋值后才会被创建，在Python中变量就是变量，它没有类型。我们所说的"类型"是变量所指的内存中对象的类型。 等号（=）用来给变量赋值，等号（=）运算符左边是变量名，等号（=）运算符右边是存储在变量名中的值。例如： integer = 100 #这是整数，整型变量float = 100.0 #这是浮点数，浮点型变量string =...
View Article一文学会 Python 多线程编程
本文作者为 Michael Driscool，是其新书 python 201 的一节。本文译者为 linkcheng，由EarlGrey@编程派校对。译者简介：linkcheng，专业电子信息工程。已有两年工作经验，从事 c/c++ 开发。目前在学习 flask，希望以后自己可以搭建网站。 Threading模块从 Python 1.5.2 版开始出现，用于增强底层的多线程模块 thread...
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