現在都用python 3了，mac本子默認2.7，不太方便，琢磨著默認改成3。先看下當前python環境，默認是2.7

axing@AX:~/axpython$ whereis python

python: /usr/bin/python2.7 /usr/bin/python2.7-config /usr/bin/python3.6m-config /usr/bin/python /usr/bin/python3.6 /usr/bin/python3.6m /usr/bin/python3.6-config /usr/lib/python2.7 /usr/lib/python3.6 /usr/lib/python3.7 /etc/python2.7 /etc/python /etc/python3.6 /etc/python3.7 /usr/local/lib/python2.7 /usr/local/lib/python3.6 /usr/include/python2.7 /usr/include/python3.6 /usr/include/python3.6m /usr/share/python /usr/share/man/man1/python.1.gz

設定python3為默認python版本

sudo update-alternatives --install /usr/bin/python python /usr/bin/python2.7 100

sudo update-alternatives --install /usr/bin/python python /usr/bin/python3.6 150

進入python，再看一下，已經改好了。

axing@AX:~/axpython$ python

Python 3.6.7 (default, Oct 22 2018, 11:32:17)

[GCC 8.2.0] on linux

Type "help", "copyright", "credits" or "license" for more information.

>>>

再看下ipython, 記得用 “pip install ipython” 安裝python2的， “pip3 install ipython” 安裝python3的。

ipython運行報錯

axing@AX:~/axpython$ ipython

Python 3.6.7 (default, Oct 22 2018, 11:32:17)

Type 'copyright', 'credits' or 'license' for more information

IPython 7.4.0 -- An enhanced Interactive Python. Type '?' for help.

In [1]: %run read_yaml.py

ERROR:root:File `'%.py'` not found.

看下工作目錄，在當前工作目錄下找py文件：

axing@Bastion_LD8:~/axpython$ ipython

Python 3.6.7 (default, Oct 22 2018, 11:32:17)

Type 'copyright', 'credits' or 'license' for more information

IPython 7.4.0 -- An enhanced Interactive Python. Type '?' for help.

In [1]: %pwd

Out[1]: '/home/axing/axpython'

In [2]: %run read_yaml.py

總結

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