如何安装Anaconda及基本的使用请参考 macOS下Anaconda的安装及环境切换（Python2/Python3）
我在安装Anaconda的时候，软件自带的版本是Python3.6的，如果我现在需要使用Python2.7或者Python3.7，应该怎么操作呢？
如果我们在Anaconda Navigator控制台上做Create操作，环境是可以成功创建，但环境里面携带的包是非常少的。
所以可以参考如下方式进行Python版本修改。
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| conda create -n python37 python=3.7 anaconda
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如果conda的版本比较旧的话，会出现如下提示：
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| ==> WARNING: A newer version of conda exists. <==
current version: 4.6.2
latest version: 4.6.7
Please update conda by running
$ conda update -n base -c defaults conda
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所以我们可以先执行命令
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| conda update -n base -c defaults conda
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然后再执行conda create命令
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| conda create -n python37 python=3.7 anaconda
Collecting package metadata: done
Solving environment: done
## Package Plan ##
environment location: /Users/simon/anaconda3/envs/python37
added / updated specs:
- anaconda
- python=3.7
The following packages will be downloaded:
package | build
---------------------------|-----------------
mkl-2019.1 | 144 154.4 MB
------------------------------------------------------------
Total: 154.4 MB
The following NEW packages will be INSTALLED:
alabaster pkgs/main/osx-64::alabaster-0.7.12-py37_0
anaconda pkgs/main/osx-64::anaconda-2018.12-py37_0
...
...
Proceed ([y]/n)? y
Downloading and Extracting Packages
mkl-2019.1 | 154.4 MB | ###################################################################################################### | 100%
Preparing transaction: done
Verifying transaction: done
Executing transaction: done
#
# To activate this environment, use:
# > source activate python37
#
# To deactivate an active environment, use:
# > source deactivate
#
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按照上面的提示，我们可以执行如下命令激活或失效某个python环境。
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| source activate python37
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