Installing Python 安装Python
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Difficulty level: ♦♢♢♢♢
Installing Python 安装Python
❝ Tempora mutantur nos et mutamur in illis. (Times change, and we change with them.) ❞
— ancient Roman proverb
Diving In
Welcome to Python 3. Let's dive in. In this chapter, you'll install the version of Python 3 that's right for you.
Which Python Is Right For You? 哪个版本适合你
The first thing you need to do with Python is install it. Or do you?
If you're using an account on a hosted server, your ISP may have already installed Python 3. If you’re running Linux at home, you may already have Python 3, too. Most popular GNU/Linux distributions come with Python 2 in the default installation; a small but growing number of distributions also include Python 3. Mac OS X includes a command-line version of Python 2, but as of this writing it does not include Python 3. Microsoft Windows does not come with any version of Python. But don’t despair! You can point-and-click your way through installing Python, regardless of what operating system you have.让咱们自己来安装Python，无论你所用的是什么系统。
The easiest way to check for Python 3 on your Linux or Mac OS X system is to get to a command line. On Linux, look in your Applications menu for a program called Terminal. (It may be in a submenu like Accessories or System.) On Mac OS X, there is an application called Terminal.app in your /Application/Utilities/ folder.
Once you’re at a command line prompt, just type python3 (all lowercase, no spaces) and see what happens. On my home Linux system, Python 3 is already installed, and this command gets me into the Python interactive shell.
在命令行下输入 python3 ，来检查是否安装了python3
mark@atlantis:~$ python3
Python 3.0.1+ (r301:69556, Apr 15 2009, 17:25:52)
[GCC 4.3.3] on linux2
Type "help", "copyright", "credits" or "license" for more information.
>>>
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import this
The Zen of Python, by Tim Peters
Beautiful is better than ugly.
Explicit is better than implicit.
Simple is better than complex.
Complex is better than complicated.
Flat is better than nested.
Sparse is better than dense.
Readability counts.
Special cases aren't special enough t ......
Python中文件操作可以通过open函数，这的确很像C语言中的fopen。通过open函数获取一个file object，然后调用read()，write()等方法对文件进行读写操作。
1.open
使用open打开文件后一定要记得调用文件对象的close()方法。比如可以用try/finally语句来确保最后能关闭文件。
file_object = open('thefile.txt' ......
from cmd import *
class MyShell(Cmd):
def preloop(self):
print "print this line before entering the loop"
def postloop(self):
&nb ......
1.Python的扩展
Python扩展是指运用其他语言编写某些功能模块，供Python程序调用，常用的有Python的C扩展和C++扩展。Python扩展的目的主要有两个：一是为了功能需要，另外一个原因是为了性能需要。下面介绍一下在不运用工具的情况下，运用C和C++语言对Python进行扩展的步骤。
扩展的第一步是用C或C++创建一个源程序，然后 ......
关于框架，之前听得比较多，特别是在CPyG的邮件列表上，不过还没有接触过。
这一章我打算略读，加上这两天身体不适，读得更加略了。
这一章提到的几个框架我听说的有TKinter和SWIG。SWIG搞了一下，TKinter看人家用过，自己还没有用过。对这些框架陌生得很。以后碰上要用了再认真学学。
到现在，对Python算是有些了解了。 ......
