1. Python2 與 Python3 軟鏈接設置

wohu@ubuntu:/usr/bin$ ll /usr/bin/python*
lrwxrwxrwx 1 root root       9 4月  16  2018 /usr/bin/python -> python2.7*
lrwxrwxrwx 1 root root       9 4月  16  2018 /usr/bin/python2 -> python2.7*
-rwxr-xr-x 1 root root 3633560 4月  16  2018 /usr/bin/python2.7*
lrwxrwxrwx 1 root root       9 6月  16 16:24 /usr/bin/python3 -> python3.6*
-rwxr-xr-x 2 root root 4526456 4月  18 09:56 /usr/bin/python3.6*
-rwxr-xr-x 2 root root 4526456 4月  18 09:56 /usr/bin/python3.6m*
lrwxrwxrwx 1 root root      10 6月  16 16:24 /usr/bin/python3m -> python3.6m*
wohu@ubuntu:/usr/bin$ sudo rm -rf python
wohu@ubuntu:/usr/bin$ ll /usr/bin/python*
lrwxrwxrwx 1 root root       9 4月  16  2018 /usr/bin/python2 -> python2.7*
-rwxr-xr-x 1 root root 3633560 4月  16  2018 /usr/bin/python2.7*
lrwxrwxrwx 1 root root       9 6月  16 16:24 /usr/bin/python3 -> python3.6*
-rwxr-xr-x 2 root root 4526456 4月  18 09:56 /usr/bin/python3.6*
-rwxr-xr-x 2 root root 4526456 4月  18 09:56 /usr/bin/python3.6m*
lrwxrwxrwx 1 root root      10 6月  16 16:24 /usr/bin/python3m -> python3.6m*
wohu@ubuntu:/usr/bin$ sudo ln -s python3.6 python
wohu@ubuntu:/usr/bin$ ll /usr/bin/python*
lrwxrwxrwx 1 root root       9 6月  29 18:54 /usr/bin/python -> python3.6*
lrwxrwxrwx 1 root root       9 4月  16  2018 /usr/bin/python2 -> python2.7*
-rwxr-xr-x 1 root root 3633560 4月  16  2018 /usr/bin/python2.7*
lrwxrwxrwx 1 root root       9 6月  16 16:24 /usr/bin/python3 -> python3.6*
-rwxr-xr-x 2 root root 4526456 4月  18 09:56 /usr/bin/python3.6*
-rwxr-xr-x 2 root root 4526456 4月  18 09:56 /usr/bin/python3.6m*
lrwxrwxrwx 1 root root      10 6月  16 16:24 /usr/bin/python3m -> python3.6m*
wohu@ubuntu:/usr/bin$ python -V
Python 3.6.9
wohu@ubuntu:/usr/bin$ python2 -V
Python 2.7.15rc1
wohu@ubuntu:/usr/bin$ python3 -V
Python 3.6.9
wohu@ubuntu:/usr/bin$ python2.7 -V
Python 2.7.15rc1
wohu@ubuntu:/usr/bin$ 

2. pip2 與 pip3 軟鏈接設置

wohu@ubuntu:/usr/bin$ ll pip*
-rwxr-xr-x 1 root root 292 1月  12  2017 pip*
-rwxr-xr-x 1 root root 292 1月  12  2017 pip2*
-rwxr-xr-x 1 root root 293 1月  12  2017 pip3*
wohu@ubuntu:/usr/bin$ pip -V
pip 9.0.1 from /usr/lib/python2.7/dist-packages (python 2.7)
wohu@ubuntu:/usr/bin$ pip3 -V
pip 9.0.1 from /usr/lib/python3/dist-packages (python 3.6)
wohu@ubuntu:/usr/bin$ pip2 -V
pip 9.0.1 from /usr/lib/python2.7/dist-packages (python 2.7)
wohu@ubuntu:/usr/bin$ sudo ln -s pip3 pip
ln: failed to create symbolic link 'pip': File exists
wohu@ubuntu:/usr/bin$ sudo rm -rf pip
wohu@ubuntu:/usr/bin$ ll pip*
-rwxr-xr-x 1 root root 292 1月  12  2017 pip2*
-rwxr-xr-x 1 root root 293 1月  12  2017 pip3*
wohu@ubuntu:/usr/bin$ sudo ln -s pip3 pip
wohu@ubuntu:/usr/bin$ ll pip*
lrwxrwxrwx 1 root root   4 6月  29 18:51 pip -> pip3*
-rwxr-xr-x 1 root root 292 1月  12  2017 pip2*
-rwxr-xr-x 1 root root 293 1月  12  2017 pip3*
wohu@ubuntu:/usr/bin$ pip -V
pip 9.0.1 from /usr/lib/python3/dist-packages (python 3.6)
wohu@ubuntu:/usr/bin$ pip2 -V
pip 9.0.1 from /usr/lib/python2.7/dist-packages (python 2.7)
wohu@ubuntu:/usr/bin$ 

總結

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