榜单
服务器优惠
AI论文
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多对多关联
多对多关联 多对多关联 使用：class:~django.db.models.ManyToManyField 来定义多对多关系 在这个例子中，一篇“Article（报刊上的文章）”可能在多个“公开发行物（对象objects）”中发布，并且一个“公开发行物（对象objects）”也有多个具体发行的对象（Article）： from django .... -
多对多关联
多对多关联 多对多关联 使用：class:~django.db.models.ManyToManyField 来定义多对多关系 在这个例子中，一篇“Article（报刊上的文章）”可能在多个“公开发行物（对象objects）”中发布，并且一个“公开发行物（对象objects）”也有多个具体发行的对象（Article）： from django .... -
Welcome
Data Science at the Command Line Welcome Data Science at the Command Line Jeroen Janssens June 10, 2019 Welcome This is the website for Data Science at the Command Line, p... -
How to Conduct Experiments
How to Conduct Experiments How to Conduct Experiments The late, great Edsger Dijkstra has eloquently explained that Computer Science is not an experimental science[ExpCS] and d... -
7. ltree 插件
ltree介绍 ltree使用 ltree_hierarchy的使用 ltree介绍 ltree是PostgreSQL的一个扩展插件，即extension，使用它可以实现树型结构，而且还支持索引和丰富的查询。 ltree 官方文档给出了详细的解释。 它的概念很简单，打个比方，比如，我们要存一个树型菜单，不限定级数，有祖先(根)，根子节有子节点... -
10.1 Let’s Recap
10.1 Let’s Recap 10.1 Let’s Recap This book explored the power of employing the command line to perform data science tasks. It is an interesting observation that the challenges... -
Chapter 1 Introduction
Chapter 1 Introduction Chapter 1 Introduction This book is about doing data science at the command line. Our aim is to make you a more efficient and productive data scientist b... -
eScience Conferences, Journals, and Workshops
e-Science Conferences, Journals, and Workshops Conferences Journals Workshops e-Science Conferences, Journals, and Workshops This is a list of Conferences, Journals, and Wor... -
OS X installation
OS X Installation libstdc++ installation OS X Installation We highly recommend using the Homebrew package manager.Ideally you could start from a clean /usr/local to avoid co... -
Installing Optional Extensions
Information about installing optional Tanzu Greenplum Database extensions and packages, such as the Procedural Language extensions and the Python and R Data Science Packages. Pr...