如何使用Anaconda将IPython4降级为3

Question

我目前正在使用IPython版本4.

$ ipython
WARNING: 'inline' not available as pylab backend, using 'auto' instead.
Python 2.7.10 |Anaconda 2.1.0 (x86_64)| (default, Oct 19 2015, 18:31:17) 
Type "copyright", "credits" or "license" for more information.

IPython 4.0.0 -- An enhanced Interactive Python.
?         -> Introduction and overview of IPython's features.
%quickref -> Quick reference.
help      -> Python's own help system.
object?   -> Details about 'object', use 'object??' for extra details.
Using matplotlib backend: MacOSX

In [1]: 

如何将其降级到版本3(少于4)？

Answer 1

通过使用¹和.conda removeconda install

conda remove将删除当前版本ipython:

conda remove ipython 

然后,您可以选择搜索ipython要安装的版本conda search ipython:

ipython                      0.13                     py27_0  defaults        
                             0.13                     py26_0  defaults        
                             0.13                     py33_1  defaults        
                             0.13                     py27_1  defaults        
                             0.13                     py26_1  defaults        
                             0.13.1                   py33_1  defaults 
... continues..
                             3.2.0                    py27_0  defaults        
                             3.2.1                    py34_0  defaults        
                             3.2.1                    py33_0  defaults        
                             3.2.1                    py27_0  defaults        
                             4.0.0                    py35_0  defaults        
                             4.0.0                    py34_0  defaults        
                          *  4.0.0                    py27_0  defaults 

使用星号条目表示您拥有的当前版本.

然后,使用conda install ipython=version_num安装所需的版本.请注意每个版本所需的默认Python版本ipython!

¹正如我最近注意到的那样,这个conda remove步骤已经过时了.您可以简单地列出python版本,conda search然后conda install使用您想要的版本执行,anaconda负责替换您:

(myenv)jim@unx: conda install ipython=3.2.0
Fetching package metadata: ....
Solving package specifications: ................

The following packages will be DOWNGRADED:

    ipython: 4.0.1-py27_0 --> 3.2.0-py27_0

Proceed ([y]/n)? y

你很高兴去.

Answer 2

尝试类似的方法：

sudo /opt/anaconda/bin/pip install -I ipython==3.2.2

-I表示忽略已安装的版本=>重新安装。