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This article will explain in detail how to install multiple python versions of Ubuntu16.04. The editor thinks it is very practical, so I share it for you as a reference. I hope you can get something after reading this article.

Ubuntu16.04 comes with python2.7 and python3.5, but the compilation of a project requires python version to be greater than or equal to 3.7, so consider installing python3.8 on the basis of the original system.

1 download and install python3.8

Python3.8 is not included in the official apt library of Ubuntu, so add deadsnakes PPA source and install python3.8, otherwise the following error will occur

Error 1:

E: unable to locate the package python3.8

E: unable to find any packages according to glob 'python3.8'

E: unable to find any packages according to the regular expression python3.8

Solution: run the following instructions to install python3.8

Sudo add-apt-repository ppa:deadsnakes/ppasudo apt-get updatesudo apt-get install python3.8

At this point, the python3 version still points to python3.5, and you can enter

Cd / usr/bin & & ll

View

2 modify python3 to point to sudo rm python3sudo ln-s python3.8 python3 by default

Check the python version to verify that the modification is successful:

$python3-- versionpython3.8.93 cannot open terminal solution

After installing python3 according to steps 1 and 2, the terminal generally cannot be opened.

Error 2:

$gnome-terminal

Traceback (most recent call last):

File "/ usr/bin/gnome-terminal", line 9, in

From gi.repository import GLib, Gio

File "/ usr/lib/python3/dist-packages/gi/__init__.py", line 42, in

From. Import _ gi

ImportError: cannot import name'_ gi'

Solution:

Changing 35 under cd / usr/lib/python3/dist-packages/gi/# to 38 means changing from py3.5 to py3.8sudo mv _ gi_cairo.cpython-35m-x86_64-linux-gnu.so _ gi_cairo.cpython-38m-x86_64-linux-gnu.sosudo mv _ gi.cpython-35m-x86_64-linux-gnu.so _ gi.cpython-38m-x86_64-linux-gnu.so

Next, modify

Sudo gedit / usr/bin/gnome-terminal

Change python3 to python

Problem solved.

Uninstall sudo apt remove python3.8sudo apt autoremove python3.85 python multi-version management of 4 python version

With reference to https://www.yisu.com/article/221437.htm, it is worth noting that the terminal will not be opened only if you configure it in the way of this blog post. It is recommended to configure it in the way described in this article before adding management.

Add versions of python to update-alternatives

$which python3.8/usr/bin/python3.8$ sudo update-alternatives-install / usr/bin/python3 python3 / usr/bin/python3.8 1$ which python3.5/usr/bin/python3.5$ sudo update-alternatives-install / usr/bin/python3 python3 / usr/bin/python3.5 2

Switch versions with the following configuration

$sudo update-alternatives-config python3There are 2 choices for the alternative python3 (providing / usr/bin/python3). Selection Path Priority Status---* 0 / usr/bin/python3.5 2 auto mode 1 / usr/bin/python3.5 2 manual mode 2 / usr/bin/python3.8 1 manual modePress to keep the current choice [*] Or type selection number: 26 upgrade pip3/pip

For Ubuntu systems where python is installed for the first time, the pip level is low, and there may be a series of problems with pip install high-version libraries in this case, such as:

Error 3:AttributeError: module 'platform' has no attribute' linux_distribution'

Solution: upgrade the pip version

Curl https://bootstrap.pypa.io/get-pip.py-o get-pip.pysudo python3 get-pip.py-force-reinstall 's article on "how to install multiple python versions of Ubuntu16.04" ends here. I hope the above content can be of some help to you, so that you can learn more knowledge. if you think the article is good, please share it for more people to see.

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