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How can I install packages?

I can't install a package with the pip or pip3 command and I can't install it from the Python Interpreter in PyCharm too. I can't tap on the '+' at the Python Interpreter in PyCharm.
I get this error:
pip command not found

Here is what you can try.
Lets check python installation.
C:\Users\User>python --version
Python 3.10.5
C:\Users\User>
If you get the version as 3.x, then we are good, else goto your python installation directory and copy its path and then add it to your environment variable PATH.
Check PIP available or not.
C:\Users\User>pip --version
pip 22.3 from C:\Users\User\AppData\Local\Programs\Python\Python310\lib\site-packages\pip (python 3.10)
C:\Users\User>
if above didn't work then add pip path to PATH environment variable which would be something similar to above output.
Now we are ready to install any package
Just do pip install package-name
for testing, you can try:
pip install numpy
If it still throws error, try below one
python -m pip install numpy
if it still throws error, then you might need to clean your python installation.

3 commands
sudo apt update
sudo apt install python3-pip
pip3 install <package_name>
or maybe
sudo apt install <package_name> -y

It looks like you don't have pip installed on $PATH. The following command will run pip without any adjustments to $PATH:
python3 -m pip install <some_module>
Pay attention to the -m, this stands for modules and runs the pip program inside the python3 interpreter (I don't know exact definition here, if anyone wishes to correct me I will update the answer)
However, if this doesn't work then you may not have pip installed, and can be installed by running:
python3 -m ensurepip --upgrade
Then, reload your shell via the following (replace bash with your shell):
exec bash
Running pip --version should now work

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

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

cant install python packages

I have multiple versions of python install in my linux.
python
python2.7
python2.7-config
python2-config
python2-jsonschema
python2-pbr
python3
python3.4
python3.4m
python3.6
python3.6-config
python3.6m
python3.6m-config
python3-config
python3m
python3m-config
python-argcomplete-check-easy-install-script
python-argcomplete-tcsh
python-config
python-faraday
I installed quandl package using pip. it's installed but when I run the code it says there is no module as quandl. I think its related to multiple versions of python.how can I uninstall these versions and which one i should uninstall and how can i install packages and run my code without any worry! I am a beginner so please help me.

in Linux,if you are using Global environment You should use python3.x for all command-line operations as in python3.4, python3.6 or pip3.4, pip3.6 when compiling so it installs to specified version.
for your problem to find the installed module run:
pip3.4 list pip3.6 list and pip 2.7 list and find quandl in them.
If it is not in the required version of yours, run: pip[your-version] install quandl

First, sure that pip3 is installed or install it.
ubuntu: sudo apt install python3-pip --upgrade
now, install your package with pip3 instead of pip:
pip3 install quandl
I hope it will work:)
EDITED:
with this code, you create a virtualenv and run your script with it.
pip3 install virtualenv
virtualenv -p python3.x venv //3.x will be version you want
source venv/bin/activate
pip install quandl, {and what else you want}
python script.py
for deactivating virtualenv, just run this in commandLine:
deavtivate

Cannot upgrade pip in cygwing running on Windows 10: /usr/bin/python: No module named pip

In cygwin I can't upgrade pip, it worked find in cmd:
$ python -m pip install --upgrade pip
/usr/bin/python: No module named pip

Likely you don't need the python -m part. If pip is in your path, then just typing pip install --upgrade pip should work. Where is pip installed? which pip will tell you where it's located, if it's in your path