如何以非超级用户身份将 Python 符号链接到 Python2.7

Question

I am a non-superuser of a linux machine. Currently it has 2 versions of Python.

When I invoke standard python command it gave version 2.6

$ python
[neversaint@mach71 ~]$ python
Python 2.6.2 (r262:71600, Jan 28 2011, 13:47:39) 
[GCC 4.1.2 20080704 (Red Hat 4.1.2-48)] on linux2
Type "help", "copyright", "credits" or "license" for more information.
>>> 

$ which python
/opt/somedir/bin/python

It's only when I invoke with python2.7 it gives the version 2.7

[neversaint@mach71 ~]$ python2.7
Python 2.7.6 (default, Nov 11 2013, 13:13:15) 
[GCC 4.4.7 20120313 (Red Hat 4.4.7-1)] on linux2
Type "help", "copyright", "credits" or "license" for more information.
>>>

$ which phython2.7
/usr/bin/python2.7

My question is how can I set it such that whenever I call $ python it will give me version 2.7.

Answer 1

You can simlink it into some directory both accessible to your user and in your $PATH . For example if /home/<your-username>/local/bin is in your $PATH then you can do

ln -s /usr/bin/python2.7 /home/<your-username>/local/bin/python

In this example /home/<your-username>/local/bin should be in your path before /usr/bin . If there is no such entry in your $PATH you can add it there:

export PATH=$HOME/local/bin:$PATH

You can also add this line to .bashrc or similar to activate it on shell start.

Answer 2

使用shell alias , alias python=/usr/bin/python2.7然后 python 将执行该别名的结果。

Answer 3

在/usr/bin创建指向 python27 或任何 python 版本的符号链接

sudo ln -s python2.7 python