python的安装和版本选型

喜欢ヅ旅行 2022-09-28 11:54 167阅读 0赞

1.安装

官网的下载目录是 http://www.python.org/ftp/python/

按需下载

centos5的python是2.4.3，同时有python26的包可用，版本是2.6.5 epel的库里的

fedora的python是2.7，同时有python3的包可以用，版本是3.1.2

2.使用

建议用py3k的语法写，但是用python2.5/2.6/2.7运行（考虑到里面的库）

详细可以借鉴http://docs.python.org/py3k/library/\_\_future\_\_.html

from \_\_future\_\_ import print\_function

然后就可以按照3k的语法来写了，但是可以在2.x上运行

<table> 
 <thead> 
  <tr> 
   <th>feature</th> 
   <th>optional in</th> 
   <th>mandatory in</th> 
   <th>effect</th> 
  </tr> 
 </thead> 
 <tbody> 
  <tr> 
   <td>nested_scopes</td> 
   <td>2.1.0b1</td> 
   <td>2.2</td> 
   <td><a href="http://www.python.org/dev/peps/pep-0227" rel="nofollow"><strong>PEP 227</strong> </a> : <em>Statically Nested Scopes</em> </td> 
  </tr> 
  <tr> 
   <td>generators</td> 
   <td>2.2.0a1</td> 
   <td>2.3</td> 
   <td><a href="http://www.python.org/dev/peps/pep-0255" rel="nofollow"><strong>PEP 255</strong> </a> : <em>Simple Generators</em> </td> 
  </tr> 
  <tr> 
   <td>division</td> 
   <td>2.2.0a2</td> 
   <td>3.0</td> 
   <td><a href="http://www.python.org/dev/peps/pep-0238" rel="nofollow"><strong>PEP 238</strong> </a> : <em>Changing the Division Operator</em> </td> 
  </tr> 
  <tr> 
   <td>absolute_import</td> 
   <td>2.5.0a1</td> 
   <td>2.7</td> 
   <td><a href="http://www.python.org/dev/peps/pep-0328" rel="nofollow"><strong>PEP 328</strong> </a> : <em>Imports: Multi-Line and Absolute/Relative</em> </td> 
  </tr> 
  <tr> 
   <td>with_statement</td> 
   <td>2.5.0a1</td> 
   <td>2.6</td> 
   <td><a href="http://www.python.org/dev/peps/pep-0343" rel="nofollow"><strong>PEP 343</strong> </a> : <em>The “with” Statement</em> </td> 
  </tr> 
  <tr> 
   <td>print_function</td> 
   <td>2.6.0a2</td> 
   <td>3.0</td> 
   <td><a href="http://www.python.org/dev/peps/pep-3105" rel="nofollow"><strong>PEP 3105</strong> </a> : <em>Make print a function</em> </td> 
  </tr> 
  <tr> 
   <td>unicode_literals</td> 
   <td>2.6.0a2</td> 
   <td>3.0</td> 
   <td><a href="http://www.python.org/dev/peps/pep-3112" rel="nofollow"><strong>PEP 3112</strong> </a> : <em>Bytes literals in Python 3000</em> </td> 
  </tr> 
 </tbody> 
</table>