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how to install Pip3 on windows 10?

I installed Python 3.10 today but when I try to run pip or pip3, the command prompt gives me an error. I tried following the instructions that the top answer in this question said. My complete path to the python interpreter is this:
C:\Users\User\AppData\Local\Microsoft\WindowsApps\python3.exe
In the WindowsApps directory, I'm supposed to have a Scripts folder. Strangely enough, I don't. Can someone please help me?

Check if pip3 is already installed
pip3 -v
if it is installed the output should be like that
C:\Python38\python.exe -m pip <command> [options]
Commands:
install Install packages.
download Download packages.
uninstall Uninstall packages.
freeze Output installed packages in requirements format.
list List installed packages.
show Show information about installed packages.
...
...
Pip3 Upgrade
python -m pip3 install --upgrade pip
Pip3 Downgrade
python -m pip3 install pip==19.0

You can try python -m pip to use pip if it is installed.
If pip is not installed, you can always use python -m ensurepip --upgrade to install pip for your python installation.

Take a look at the following post
How can I install pip on Windows?
py -3 -m ensurepip

Does `pip install -U pip -r requirements.txt` upgrade pip before installing the requirements?

It seems to be common practice to set up a Python virtual environment using some variant of the following:
python -m venv venv && source ./venv/bin/activate
python -m pip install -U pip -r requirements.txt
What I hope the above command does is:
Upgrade pip first
Run the installation of the packages in requirements.txt
However, what actually seems to happen is:
Collects all packages, including newest version of pip
Installs them all together
The original/outdated version of pip is what actually runs the installs
And the new version of pip is not used until after this command
Question(s)
Is it possible to have pip upgrade itself and then install a requirements file, in one command?
Would this infer any particular benefits?
Should I switch to the following?
python -m venv venv && source ./venv/bin/activate
python -m pip install -U pip
python -m pip install -r requirements.txt
What is the optimal method to install requirements files?
I see people sometimes installing/upgrading wheel and setuptools as well

The answers to your questions are:
No. pip doesn't currently treat itself as a special dependency, so it doesn't know to install then execute itself, which is what it would need to do to overcome the problems you observed.
Updating pip in a separate step is indeed the recommended way to proceed.
You may from time to time see pip issue a message advising that a newer version is available. This happens a lot if you create them from a python with an outdated pip.

I had a situation similar to yours, I needed to first upgrade pip and then install a bunch of libraries in a lab that had 20 PCs. What I did was writing all the librarie's name in a requirements.txt file, then create a .bat file with two commands:
`python -m pip install --upgrade pip`
`pip install -r requirements.txt`
The first command for upgrading pip and the second one for installing all the libraries listed in the requirements.txt file.

Python not seeing packages after pip install

When I run the following command within my virtual env
sudo pip3 install -r requirements.txt
It says that the packages were successfully installed, but when I try to run or import the packages, it can not find them.
pip3 show returns nothing.
However, when I manually run
sudo pip3 install package-name
It installs the package just fine and it works.
Why is pip install -r requirements.txt not working? It always worked in the past. Now that I reinstalled Python it stopped working..
System:
Ubuntu 14.04
Python changed from 3.4 to 3.6.2
requirements.txt
Django==2.0.8
django-debug-toolbar
channels
Debugging in Terminal:
EDIT: This makes no sense.
pip3 install -r requirements.txt
Requirement already satisfied: pycparser in /usr/local/lib/python3.6/site-packages (from cffi!=1.11.3,>=1.8->cryptography>=2.7->autobahn>=0.18->daphne~=2.3->channels==2.3.0->-r requirements.txt (line 79)) (2.19)
$ pip3 --version
pip 19.2.3 from /home/dominic/Desktop/projects/printrender/env/lib/python3.6/site-packages/pip (python 3.6)
I install packages in my Virtual Environemnt using pip3 install -r requirements and it says that they are already installed, but when I run Pip Freeze, it returns nothing, as if nothing is installed.
Pip3 install -r requirements is placing my packages in my local packages python packages, and pip freeze is referencing my virtual env packages.
pip is not installing this packages in the correct place

I don't think you should use sudo when you're using a virtual environment. Try without.

I think you created a virtual environment for python 2 by mistake since pip3 is used from /usr/local/lib/python3.6 instead of in the env. You can create the virtual environment specifically for python3 by using the command
virtualenv -p python3 env
Could you try creating a new virtual environment with the command above and see if it works?

Using sudo was part of the issue and some of the packages in my requirements.txt were causing errors with the latest version of pip.

When you use sudo, you installed your packages globally. This must solve your problem.
sudo su
. venv/bin/activate
pip install -r requirements.txt

pip install package with --user and without --user, now I want to uninstall package installed without --user

First, I run
pip install virtualenv
and later, I run
pip install --user virtualenv
So, this is what I have now
$ which -a virtualenv
/Users/admin/.local/bin/virtualenv
/usr/local/bin/virtualenv
This is my default virtualenv
/Users/admin/.local/bin/virtualenv
Now I want to uninstall, this,
/usr/local/bin/virtualenv
What should I do?
Thanks!

I tried
pip uninstall virtualenv
It removed /usr/local/bin/virtualenv, the system wide package.
The package I installed using --user flag, which cannot be uninstalled.
I just manually removed the folder.
See this thread.
How to uninstall a package installed with pip install --user

How to upgrade pip3?

I want to use python3.5 for development, but many times when I install the module for python 3.5, it always fails. The terminal tells me that a higher version is available, but it doesn't work when I upgrade it.

You are using pip3 to install flask-script which is associated with python 3.5. However, you are trying to upgrade pip associated with the python 2.7, try running pip3 install --upgrade pip.
It might be a good idea to take some time and read about virtual environments in Python. It isn't a best practice to install all of your packages to the base python installation. This would be a good start: http://docs.python-guide.org/en/latest/dev/virtualenvs/

To upgrade your pip3, try running:
sudo -H pip3 install --upgrade pip
Your pip may move from /bin to /usr/local/bin
To upgrade pip as well, you can follow it by:
sudo -H pip2 install --upgrade pip

Try this command:
pip3 install --upgrade setuptools pip

First decide which pip you want to upgrade, i.e. just pip or pip3.
Mostly it'll be pip3 because pip is used by the system, so I won't recommend upgrading pip.
The difference between pip and pip3 is that
NOTE: I'm referring to PIP that is at the BEGINNING of the command
line.
pip is used by python version 2, i.e. python2
and
pip3 is used by python version 3, i.e. python3
For upgrading pip3: # This will upgrade python3 pip.
pip3 install --upgrade pip
For upgrading pip: # This will upgrade python2 pip.
pip install --upgrade pip
This will upgrade your existing pip to the latest version.

The Problem
You use pip (the Python 2 one). Now you want to upgrade pip (the Python 3 one). After that, pip is the Python 3 one.
The solution
Use pip2 and pip3. This way it is explicit.
If you want to use pip, just check where it is (which pip) and change the link. For example:
$ which pip
/usr/local/bin/pip
$ pip --version
pip 9.0.1 from /usr/local/lib/python3.5/dist-packages (python 3.5)
$ which pip2
/usr/local/bin/pip2
$ sudo rm /usr/local/bin/pip
$ sudo ln -s /usr/local/bin/pip2 /usr/local/bin/pip
$ pip --version
pip 9.0.1 from /usr/local/lib/python2.7/dist-packages (python 2.7)

for Python 3:
python3 -m pip install --upgrade pip
for Python 2:
python2 -m pip install --upgrade pip

What worked for me was the following command:
python -m pip install --upgrade pip

pip3 install --upgrade pip worked for me

In Ubuntu 18.04, below are the steps that I followed.
python3 -m pip install --upgrade pip
For some reason you will be getting an error, and that be fixed by making bash forget the wrongly referenced locations using the following command.
hash -r pip

If you have 2 versions of Python (eg: 2.7.x and 3.6), you need do:
add the path of 2.x to system PATH
add the path of 3.x to system PATH
pip3 install --upgrade pip setuptools wheel
for example, in my .zshrc file:
export PATH=/usr/local/Cellar/python#2/2.7.15/bin:/usr/local/Cellar/python/3.6.5/bin:$PATH
You can exec command pip --version and pip3 --version check the pip from the special version. Because if don't add Python path to $PATH, and exec pip3 install --upgrade pip setuptools wheel, your pip will be changed to pip from python3, but the pip should from python2.x

This worked for me (mac)
sudo curl https://bootstrap.pypa.io/get-pip.py | python

If you try to run
sudo -H pip3 install --upgrade pip3
you will get the following error:
WARNING: You are using pip version 19.2.3, however version 21.0.1 is available.
You should consider upgrading via the 'pip install --upgrade pip' command.
but if you upgrade using the suggested command:
pip install --upgrade pip
then, the legacy pip will be upgraded, so what I did is the following:
which pip3
and I located my pip3 installation (just in case the following command wouldn't upgrade the legacy pip. Then i changed to that directory and upgraded pip3 using the following commands: (your directory could be different)
cd /Library/Frameworks/Python.framework/Versions/3.8/bin
sudo -H pip3 install --upgrade pip
after this:
pip --version
will still show the legacy version, while
pip3 --version
will show pip 21.0.1