Ubuntu Download Python 3

Having used Ubuntu 18.04 for a handful of years now, and reading that Python 2 has been removed from Ubuntu 20.04, I was looking forward to using the commands python or pip rather than python3 or pip3. So today I tried Ubuntu 20.04 for the first time, and found:

The middle of these 3 links is the most descriptive, but none are especially clear about what python-is-python3 is/does and the full scope of ramifications if sudo apt-get install python-is-python3 was to be ran on a Ubuntu 20.04 install.

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I gather if I was to run python-is-python3 from the command prompt then I could use the command python instead of python3. First can somebody confirm this, and second, does the same go for pip, i.e. pip instead of pip3?

The launchpad.net link above mentions creation of a symlink. Does python-is-python3 really just create a single symlink? It seems odd to introduce a package for such a bare bones purpose. Also, if this package is subsequently uninstalled (i.e. sudo apt --purge remove python-is-python3) does this remove the symlink?

It seems the benefit of running python-is-python3 would be not having to add the 3 at the end of Python commands, but the disadvantage is that you would then have a non-standard Ubuntu setup, is this a fair summary of the python-is-python3 benefit/drawback?

So, all official Ubuntu packages will depend explicitly on "python2" or "python3", and invoke the appropriate command. The default "python" command is deliberately undefined so that any scripts referencing it have to be updated to unambiguously depend on one version or the other.

However, users may have code that relies on the "python" command being available, and know that they can safely point it across their whole system to one version or the other. The python-is-python3 package (and its counterpart, python-is-python2) are a convenient way to set up a symlink for this purpose.

Linux distributions are extremely complex systems made up of a large number of simple components. The power of package managers comes in their flexibility to do simple things like this in a unified way. For instance, a server setup script might have a long list of apt packages that an application needs to be installed, and can simply include python-is-python3 in that list. Shipping a package for this purpose is considerably simpler than having a user guide explaining how to manage the symlink manually.

If you open up the .deb file for the package (I used 7-Zip), you can see that apart from some documentation, it really does just contain one symlink, to be installed at /usr/bin/python, pointing to /usr/bin/python3.

In Ubuntu, all python packages use explicit python3 or python2 interpreter and do not use unversioned /usr/bin/python at all. Some third-party code is now predominantly python3 based, yet may use /usr/bin/python.

python-is-python3 is a convenience package which ships a symlink to point the /usr/bin/python interpreter at the current default python3. It may improve compatibility with other modern systems, while breaking some obsolete or third-party software.

#!/usr/bin/env python which searches for the Python interpreter in the whole PATH. However, some Unices may not have the env command, so you may need to hardcode /usr/bin/python as the interpreter path.

First of all, make sure that you have an outdated version of Python installed on your system. You can do this by entering python3 --version in your terminal. Note down the version details.

You can find out what's the latest version available by searching the internet. A quick Google search on "python latest version number" would suffice. If the two numbers don't match, then you are probably running an outdated version.

Note: Within the virtual environment, you can use the command python instead of python3, and pip instead of pip3 if you would prefer. If you use Python 3 on your machine outside of an environment, you will need to use the python3 and pip3 commands exclusively.

Note that if the version of the python3 package is not recent enoughfor you, there may be ways of installing more recent versions as well,depending on you distribution. For example installing the python3.9 packageon Fedora 32 to get Python 3.9. If you are a Fedora user, you might wantto read about multiple Python versions available in Fedora.

Package python-pip is not available, but is referred to by another package.

This may mean that the package is missing, has been obsoleted, or

is only available from another source

However the following packages replace it:

python3-pip

Ok, I completely deleted the /ardupilot directory from my system.

Then per Ardupilot instructions: created a fork of the main Ardupilot repository and my GitHub account and cloned the fork.

The Tools/environment_install/install-prereqs-ubuntu.sh -y script works now ye!

A question remains: Is the latest stable version of ArduSub included in the main Ardupilot repository or should I follow the instructions from Ardusub:

Yes, system_python_version is only set to 3 when ansible_distribution_release is focal, which is the code name for Ubuntu 20. In any other case, it would be set to an empty string, as it is in your case with Ubuntu 22 (code name jammy).

There are no python packages with just python- for recent Ubuntu distributions, as it is the case with python-boto (without the 3) in Ubuntu repository, while package python3-boto exists for Ubuntu jammy.

For a backwards-compatible, future-proof, potential PR that fixes the issue, one could modify the code so that the empty string (Python 2) is used for everything below Ubuntu focal. But just depending on code names for deciding the Python version of the python packages may not be the most ideal solution anyway.

Your Ubuntu distribution - which appears to be 19.04 - came with Python 3. So running python3 --version would have worked "out of the box." It seems like the OP was a bit confused about the purpose of pyenv, which is to easily switch between multiple versions of Python.

~jonathonf/+archive/ubuntu/python-3.6

This PPA has been removed from public access as part of a protest against the abuse of open-source projects by large companies. For more detail visit the main page here: ~jonathonf

The Debian/Ubuntu package is split in three different packages calledpython3-sklearn (python modules), python3-sklearn-lib (low-levelimplementations and bindings), python3-sklearn-doc (documentation).Only the Python 3 version is available in the Debian Buster (the more recentDebian distribution).Packages can be installed using apt-get:

Maybe one python module from the requirements is missing and cannot be installed, I had this problem also recently.

To fix it, you need to know which module causes the problem. Run pip3 install -r requirements.txt in the mbed-os dir, then you should see the module where it hangs. It may happen that a requested version is no longer available, then you can edit the requirements.txt and use higher version for that module. Run the pip install again to check if it is ok and undo the changes to make the mbed-os equal with the git branch.

Python is already installed and runs in a terminal window with either python or python3. It seems to be behaving in exactly the same way as with Ubuntu. I opened a small Python file hello.py, ran build system with Python selected followed by build. The console window opens but with no output.

I have troubles installing Pystan in Python 3.10 on my Ubuntu 20.04 system. I have already tried all the possible troubleshooting, as well as e.g. a similar issue (Error installing Pystan in python 3.10 with gcc 9.2.0).

Thanks for the fast reply! Could you give little more information on how to proceed? I have installed httpstan (python3 -m pip install httpstan) or is this not how to install it from source? I googled for C++ toolchain but no concrete instructions popped up.

In this tutorial, we have walked you through various ways of installing Python3 on Ubuntu 22.04. In addition, we have gone a step further and set up a virtual python3 programming environment for running Python programs in isolation from other projects.

The packages provided here are loosely based on the debian upstream packages with some modifications to make them more usable as non-default pythons and on ubuntu. As such, the packages follow debian's patterns and often do not include a full python distribution with just `apt install python#.#`. Here is a list of packages that may be useful along with the default install:

- `python#.#-dev`: includes development headers for building C extensions

- `python#.#-venv`: provides the standard library `venv` module

- `python#.#-distutils`: provides the standard library `distutils` module

- `python#.#-lib2to3`: provides the `2to3-#.#` utility as well as the standard library `lib2to3` module

- `python#.#-gdbm`: provides the standard library `dbm.gnu` module

- `python#.#-tk`: provides the standard library `tkinter` module

The ansible or ansible-core packages may be available in your operating systems package manager, and you are free to install these packages with your preferred method. For more information, see the Installing Ansible on specific operating systems guide. These installation instructions only cover the officially supported means of installing the python packages with pip.

Locate and remember the path to the Python interpreter you wish to use to run Ansible. The following instructions refer to this Python as python3.For example, if you have determined that you want the Python at /usr/bin/python3.9 to be the one that you will install Ansible under, specify that instead of python3.

If you see an error like No module named pip, you will need to install pip under your chosen Python interpreter before proceeding.This may mean installing an additional OS package (for example, python3-pip), or installing the latest pip directly from the Python Packaging Authority by running the following: 17dc91bb1f