Mac OSX：切换到Python 2.7.3

Question

I've installed the Mac OSX Python 2.7.3 , and tried switching to the new version:

$ python2.7 -V
Python 2.7.3         # It was installed
$ python -V
Python 2.6.1         # Default is 2.6
$ export VERSIONER_PYTHON_VERSION=2.5
$ python -V
Python 2.5.4         # I can switch to 2.5
$ export VERSIONER_PYTHON_VERSION=2.6
$ python -V
Python 2.6.1         # And 2.6

But:

$ export VERSIONER_PYTHON_VERSION=2.7
$ python -V
python: VERSIONER_PYTHON_VERSION environment variable error (ignored)
Python 2.6.1

Can't switch to 2.7! Why is that?

Answer 1

The python.org install will put a python executable in /usr/local/bin . Apple's python is in /usr/bin

To call the python.org python you can use its full path /usr/local/bin/python or change your path to put /usr/local/bin before /usr/bin. You will still be able to call Apple's python by using its full path /usr/bin/python

Some python installs eg Macports provide a tool that provides symbolic links to various python installs and allows you to switch between them.

Answer 2

我不认为我们可以在不使用像MacPorts或ActivePython这样的东西的情况下在Mac OS X上切换python版本。

Answer 3

我认为这是因为VERSIONER_PYTHON_VERSION特定于apple构建的python包。