Whenever you write something, an article, a blog post or a paper, you may have a question: “how to write it so that my readers will like it”? In his lecture “Writing Beyond the Academy”, Professor Larry McEnerney from The University of Chicago gave his advice.

We know that the boolean value of 0 is False, and the boolean value of 1 is True. What about the boolean value of a negative number, for example, -2 ? What’s the result of the expression True and 3 in Python? Is it True or False, or other value? Let’s find it out.

Maybe you just began to use Linux, or maybe you need to run programs in Terminal/Shell, in both cases, you need a command reference or cheat sheet. Here’s what you’re looking for, a list of some basic commands with examples.

最近在学习Numpy时，对函数设置中axis（轴）参数有些困惑，学习了这两篇文章： Python · numpy · axis 和 Numpy:对Axis的理解， 感觉自己弄明白了，在这里分享我的理解，欢迎交流和指正。

注：本文中部分内容是 Python for Data Analysis (by Wes Mckinney) 一书的学习笔记。

接着上一篇文章，我们从 Anaconda 命令行打开 Jupyter Notebook，在浏览器中会看到类似下图的页面，下方还有文件夹或者文件的列表。

“工欲善其事，必先利其器”。在机器学习领域，经常使用的一个工具就是 Python 软件。Python 怎么安装和使用呢？