依次執行如下命令：需要root權限，普通用戶可以使用sudo 來執行以下命令

[email protected]:~# add-apt-repository ppa:fkrull/deadsnakes

[email protected]:~# apt-get update

[email protected]:~# apt-get install python3.5

[email protected]:~# python
Python 2.7.6 (default, Jun 22 2015, 17:58:13)
[GCC 4.8.2] on linux2
Type "help", "copyright", "credits" or "license" for more information.
>>> exit()

這樣就安裝好了，不過由於環境變量的影響，因此，默認情況下，輸入python進入的是python2.7.6，輸入python3進入的是python3.4，只有輸入python3.5才進入到python3.5。因此我們可以根據需要做以下更改：

[email protected]:~# ln -s /usr/bin/python3.5 /usr/bin/python35

[email protected]:~# python35
Python 3.5.3 (default, Apr 22 2017, 00:00:00)
[GCC 4.8.4] on linux
Type "help", "copyright", "credits" or "license" for more information.
>>>

[email protected]:~# mv /usr/bin/python3 /usr/bin/python34

[email protected]:~# python34
Python 3.4.3 (default, Oct 14 2015, 20:28:29)
[GCC 4.8.4] on linux
Type "help", "copyright", "credits" or "license" for more information.
>>>

安裝pip

[email protected]:~# wget https://bootstrap.pypa.io/get-pip.py

[email protected]:~# python35 get-pip.py

[email protected]:~# pip3 install setuptools –upgrade

[email protected]:~# pip -V
pip 9.0.1 from /usr/local/lib/python3.5/dist-packages (python 3.5)

新手小白初學Python，如有錯誤之處，歡迎指正。

ubuntu server 14.04LTS升級Python3.5