各个系统下的Python解释器相关安装方法
Python下载
Python最新源码，二进制文档，新闻资讯等可以在Python的官网查看到：
Python官网：http://www.python.org/
你可以在一下链接中下载Python的文档，你可以下载 HTML、PDF 和 PostScript 等格式的文档。
Python文档下载地址：www.python.org/doc/
Python安装
Python已经被移植在许多平台上（经过改动使它能够工作在不同平台上）。
您需要下载适用于您使用平台的二进制代码，然后安装Python。
如果您平台的二进制代码是不可用的，你需要使用C编译器手动编译源代码。
编译的源代码，功能上有更多的选择性， 为python安装提供了更多的灵活性。
以下为不同平台上安装Python的方法：
Unix & Linux 平台安装 Python:
以下为在Unix & Linux 平台上安装 Python 的简单步骤：
打开WEB浏览器访问http://www.python.org/download/
选择适用于Unix/Linux的源码压缩包。
下载及解压压缩包。
如果你需要自定义一些选项修改Modules/Setup
- 执行 ./configure 脚本
- make
- make install
执行以上操作后，Python会安装在 /usr/local/bin 目录中，Python库安装在/usr/local/lib/pythonXX，XX为你使用的Python的版本号。
Window 平台安装 Python:
以下为在 Window 平台上安装 Python 的简单步骤：
打开WEB浏览器访问http://www.python.org/download/
在下载列表中选择Window平台安装包，包格式为：python-XYZ.msi 文件 ， XYZ 为你要安装的版本号。
要使用安装程序 python-XYZ.msi, Windows系统必须支持Microsoft Installer 2.0搭配使用。只要保存安装文件到本地计算机，然后运行它，看看你的机器支持MSI。Windows XP和更高版本已经有MSI，很多老机器也可以安装MSI。
下载后，双击下载包，进入Python安装向导，安装非常简单，你只需要使用默认的设置一直点击"下一步"直到安装完成即可。
MAC 平台安装 Python:
最近的Mac OS系统都自带有Python环境，但是自带的Python版本为旧版本，你可以通过链接http://www.python.org/download/mac/ 查看MAC上Python的新版功能介绍。
MAC上完整的Python安装教程你可以查看：http://homepages.cwi.nl/~jack/macpython/index.html
环境变量配置
程序和可执行文件可以在许多目录，而这些路径很可能不在操作系统提供可执行文件的搜索路径中。
path(路径)存储在环境变量中，这是由操作系统维护的一个命名的字符串。这些变量包含可用的命令行解释器和其他程序的信息。
Unix或Windows中路径变量为PATH（UNIX区分大小写，Windows不区分大小写）。
在Mac OS中，安装程序过程中改变了python的安装路径。如果你需要在其他目录引用Python，你必须在path中添加Python目录。
在 Unix/Linux 设置环境变量
在 csh shell: 输入
setenv PATH "$PATH:/usr/local/bin/python"
, 按下"Enter"。
在 bash shell (Linux): 输入
export PATH="$PATH:/usr/local/bin/python"
，按下"Enter"。
在 sh 或者 ksh shell: 输入
PATH="$PATH:/usr/local/bin/python"
, 按下"Enter"。
注意: /usr/local/bin/python 是Python的安装目录。
在 Windows 设置环境变量
在环境变量中添加Python目录：
在命令提示框中(cmd) : 输入
path %path%;C:\Python
, 按下"Enter"。
注意: C:\Python 是Python的安装目录。
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