如何在FreeBSD中默认设置Python版本？

Question

我正在尝试安装应用程序节点,但默认情况下我的环境是python 3,并且需要python 2.6.如何在FreeBSD中更改默认的python版本？

# cd /usr/local/bin
# ls -l | grep python
-r-xr-xr-x   2 root  wheel  1246256 Jul 12  2011 python
-r-xr-xr-x   2 root  wheel     1401 Jul 12  2011 python-config
-r-xr-xr-x   2 root  wheel     6060 Jul 12  2011 python-shared
-r-xr-xr-x   2 root  wheel     1408 Jul 12  2011 python-shared-config
-r-xr-xr-x   1 root  wheel     3720 Jul 12  2011 python-shared2.6
-r-xr-xr-x   1 root  wheel     1431 Jul 12  2011 python-shared2.6-config
-r-xr-xr-x   2 root  wheel     6060 Jul 12  2011 python-shared3.1
-r-xr-xr-x   2 root  wheel     1408 Jul 12  2011 python-shared3.1-config
-r-xr-xr-x   1 root  wheel  1182056 Jul 12  2011 python2.6
-r-xr-xr-x   1 root  wheel     1424 Jul 12  2011 python2.6-config
-r-xr-xr-x   2 root  wheel  1246256 Jul 12  2011 python3.1
-r-xr-xr-x   2 root  wheel     1401 Jul 12  2011 python3.1-config

Answer 1

你应该删除python元端口/usr/ports/lang/python.然后在以下位置设置以下变量/etc/make.conf:

PYTHON_DEFAULT_VERSION='python3.2'

(如果你想要最新版本.或者你也可以使用python3.1.目前,默认是python2.7.)

现在/usr/ports/lang/python重新安装.请注意,端口可以请求另一个版本的python!

更新:自2013年10月以来,有一种设置默认版本的新方法;

20131003:
  AFFECTS: users of lang/python* and ports
  AUTHOR: mva@FreeBSD.org

  The default versions of lang/python* have been changed to support the
  new DEFAULT_VERSIONS variable.

  PYTHON_DEFAULT_VERSION, PYTHON2_DEFAULT_VERSION and
  PYTHON3_DEFAULT_VERSION are deprecated. If you have set them in your
  make.conf, you should change them something like

  DEFAULT_VERSIONS=python=2.7 python2=2.7 python3=3.3

Answer 2

您可以删除/usr/local/bin/python并创建到Python 2.6的符号链接：

rm /usr/local/bin/python
ln -s /usr/local/bin/python2.6 /usr/local/bin/python