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How do I install pip on linux for Python 3.10.9

I was using sudo apt-get install python3-pip to get pip with older versions of Python, but as I understand I have to install a newer version of pip using some different approach because it is not uptodate using apt. I am using an Ubuntu pc and a Raspberry pi for reference, Many posts about this but what is the currently accepted approach as of Jan 2023? Thanks!
EDIT:
Using pip -V informes that it is using pip 20.3.4 (python 3.9)
I have Python 3.10.9 installed, and the console informs me version 22.3.1 is also installed
Requirement already satisfied: pip in /usr/local/lib/python3.10/site-packages (22.3.1)
Anyone know how to use version 22.3.1 ?

did you tested get-pip.py?
simply download it from here, and run
python get-pip.py

Based on my experience with Raspberry Pi, it should be straightforward with apt install.
sudo apt update
sudo apt install python3-pip
Verify the version:
pip3 --version
Odoo Forum Reference: https://www.odoo.com/forum/help-1/how-to-install-pip-in-python-3-on-ubuntu-18-04-167715

sudo apt-get install python3-pip and then use
python3 -m pip install --upgrade pip to upgrade pip
or you can do that.
sudo python3.10.9 -m pip install pip

How to install pip3 without upgrading Python version?

I'm trying to install software in kali that requires my Python version to be 3.6.9 or lower.
I also need to install pip to install requirements.
I have Python3.6.9 installed and when I run #apt-get install python3-pip
It also updates my Python version to 3.10
Is there a way to get pip installed without upgrading my python version?

If you are looking to install pip on to an existing python installation, which did not come with pip pre-installed, you can use the bootstrap script to that.
Like
curl -sSL https://bootstrap.pypa.io/get-pip.py -o get-pip.py
python get-pip.py #or python3
If you want to update the pip version installed, then you can use
python -m pip install --upgrade pip

Pip Install keeps installing libraries to Python2.7 rather than Python3

I'm trying to install modules such as gitpython into my Python3 directory however when I run:
Pip install gitpython it automatically downloads it into python2.7
I've tried specify the Python3 directory but it says the the library has already been installed.
Requirement already satisfied: gitpython in /usr/local/lib/python2.7/dist-packages (2.1.11)
Problem is when I try to call from git import repo my Python3 can't find the module.
Is there anyway to get pip to install my libraries to Python3 as a default, can I just uninstall Python 2.7 to save problems?
I run
sudo apt install python3-pip
and it states it is already installed, so I run sudo pip3 install gitpython and it says Command 'pip3' not found, but can be installed with:
sudo apt install python3-pip
SOLUTION
sudo apt-get remove python3-pip; sudo apt-get install python3-pip

It depends of your version of pip. But I think that python3-pip may do the trick.
sudo apt-get install python3-pip
sudo pip3 install MODULE_NAME

You should use pip3 to install your packages in your python3 environment. thus instead of installing with pip use pip3 install gitpython

You can try to see the version of python with:
python --version
if the result is python 2.7, that means that your environment variable for python3 needs to be set.
After that you can try:
python -m pip install package_name
I hope it will help you =)
Adrien

You should use python3 venv Python 3 venv
python3 -m venv /path/virtual/environment
source /path/virtual/environment/bin/activate
or use pip3 to installing any libraries for python 3
$ pip3 install 'some library'

You should create virtual environment for python3. using:
virtualenv -p /usr/bin/python3 <VIRTUAL_ENV NAME>
Then activate it using:
source <VIRTUAL_ENV NAME>/bin/activate
Then install your dependency(gitpython in your case) into that.

Recommended way to install pip(3) on centos7

I am interrested in knowing the recommended way to install pip3 for python3.6 (as of today, may 2018) on current version of centos7 (7.5.1804) and the accepted answer of How to install pip in CentOS 7? seems to be outdated because:
yum search -v pip
outputs (among other things):
python2-pip.noarch : A tool for installing and managing Python 2 packages
Repo : epel
python34-pip.noarch : A tool for installing and managing Python3 packages
Repo : epel
and python34-pip seems to be a (newer?) simpler way than the accepted answer of How to install pip in CentOS 7? :
sudo yum install python34-setuptools
sudo easy_install-3.4 pip
But since the versions of python installed on my machine are 2.7.5 and 3.6.3 why is it python34-pip and not python36-pip ? Is pip the same for 3.4+ (up to current 3.6.3) ?

Is pip the same for 3.4+
No, it's not. A single pip installation serves a single Python distribution (pip2.7/pip3.4/pip3.5 etc).
Since Python 3.5, pip is already bundled with the python distribution, so you can just run python3.6 -m pip instead of pip.
Python 3.6 is not available in CentOS 7 vanilla repo. I usually resort to IUS repo when needing to install a fresh Python on CentOS. It always has the most recent Python version, the current one being 3.6.5. It also offers a correspondent pip package.
$ yum install https://centos7.iuscommunity.org/ius-release.rpm
$ yum install python36u python36u-devel python36u-pip
Unfortunately, IUS doesn't offer a package for Python 3.7 yet so if you are looking for Python 3.7 on CentOS 7, building from source is your only option.
Edit: when yum is not an option
You should prefer the bootstrapping solution described in this answer as it is the most reliable way to get a working pip installed.

To install pip for python 3.6 on CentOS 7 you need to run
$ python3.6 -m ensurepip

Follow these commands in Centos 7
yum install python36
yum install python36-devel
yum install python36-setuptools
easy_install-3.6 pip
to check the pip version:
pip3 -V
pip 18.0 from /usr/local/lib/python3.6/site-packages/pip-18.0-py3.6.egg/pip (python 3.6)

There is now a python3-pip package in the CentOS 7 base repository as of 2019-08-22. There is no longer a need for third-party repositories or packages.
Installing python3-pip will also install libtirpc, python3, python3-libs, and python3-setuptools:
yum install --assumeyes python3-pip
You can now verify the version (yes, it is old, but it's what is coming from the base repository):
$ pip3 --version
pip 9.0.3 from /usr/lib/python3.6/site-packages (python 3.6)
If you don't want to stray from the files provided by the python3-pip package, and you don't want to see warnings about pip being old, see https://stackoverflow.com/a/46288945/534275 for silencing the messages.

Pip is not bundled in the EPEL version of python 3.6 for some reason. I assume a decent amount of people (such as me) will find this page because of that.
$ sudo yum install -y python36
...
$ python36 -m pip
/usr/bin/python36: No module named pip
So in this case, the setuptools package was the easiest solution.
$ sudo yum install python36-setuptools
$ sudo easy_install-3.6 pip
...
$ python36 -m pip --version
pip 18.0 from /usr/local/lib/python3.6/site-packages/pip-18.0-py3.6.egg/pip (python 3.6)

In case you're seeing that pip3 is linked to python2 path:
$ pip3 -V
pip 8.1.2 from /usr/lib/python2.7/site-packages/pip (python 2.7)
You'll probably get:
$ pip3 install --upgrade pip
TypeError: parse() got an unexpected keyword argument 'transport_encoding'
Then try to clear commands cache with hash -r. This has worked for me:
# Install Python 3:
sudo yum install python36 -y
# Install & Upgrade pip3
sudo python36 -m pip install --upgrade pip
# Validate pip3 installation:
sudo python3.6 -m ensurepip
# Successfully installed pip-10.0.1 setuptools-39.0.1
# Clear commands cache
hash -r
# might be required if getting in bash: /usr/bin/pip3: No such file or directory)
pip3 -V
# pip 19.0.3 from /usr/local/lib/python3.6/site-packages/pip (python 3.6)
which pip3
# /usr/local/bin/pip3
pip2 -V
# pip 8.1.2 from /usr/lib/python2.7/site-packages (python 2.7)
which pip2
# /usr/local/bin/pip2
# Install your Python3 module:
sudo /usr/local/bin/pip3 install {required module for python3}

I got this error when I tried to install python36 over the built-in centos7 python 2.7.5 version:
Transaction check error:
file /etc/rpm/macros.python from install of python-rpm-macros-3-32.el7.noarch conflicts with file from package python-devel-2.7.5-80.el7_6.x86_64
And I fixed it with these:
yum install python36
yum update python-devel
yum install python36-devel
easy_install-3.6 pip

Try This::
sudo yum update
sudo yum install -y python36u python36u-libs python36u-devel python36u-pip
Working for me perfectly.

Installing pip on ubuntu 16.04

I was installing pip for python3. I used the following command for that:
sudo apt-get install python3-pip
But after installation it still says pip is not installed.
I have python 3.5.2 installed.

The python3-pip package installs pip for Python 3, which is named pip3. Plain pip is pip for Python 2, which is installed by the python-pip package.

The best way to install it, is by :
wget https://bootstrap.pypa.io/get-pip.py
cd ~/Downloads/ (if your version is english, in french you find it Téléchargements)
Then once you downloaded it, try :
sudo python3 get-pip.py

easy_install -U pip : this solved my problem on ubuntu 16.04