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Why can't python find my installed libaries?

I use python 3.9 and it is no longer able to find the libraries that I have installed libaries even though they are installed.
When I for example import pandas I get this message,
>>> import pandas
Traceback (most recent call last):
File "<pyshell#0>", line 1, in <module>
import pandas
ModuleNotFoundError: No module named 'pandas'
When I use pip to install the library it tells me that it already has been installed.
C:\Users\malth>pip install pandas
Requirement already satisfied: pandas in c:\users\malth\appdata\local\programs\python\python39\lib\site-packages (1.2.3)
Requirement already satisfied: python-dateutil>=2.7.3 in c:\users\malth\appdata\local\programs\python\python39\lib\site-packages (from pandas) (2.8.1)
Requirement already satisfied: pytz>=2017.3 in c:\users\malth\appdata\local\programs\python\python39\lib\site-packages (from pandas) (2021.1)
Requirement already satisfied: numpy>=1.16.5 in c:\users\malth\appdata\local\programs\python\python39\lib\site-packages (from pandas) (1.20.1)
Requirement already satisfied: six>=1.5 in c:\users\malth\appdata\local\programs\python\python39\lib\site-packages (from python-dateutil>=2.7.3->pandas) (1.15.0)
I can even see the library in the site-packages folder.

Try creating virtual environment, configure it and then install whatever module you require. Its the most easiest way to skip module error anytime.

Try to do pip --version. If you have a multiple pythons on your pc, you might have a pip that linked to another version.
I guess you should try to use pyenv or virtualenv. This modules allowed you to avoid situation which I described above. Also it's a good practice to keep you python env isolated for a specific project.

As N.Singh has suggested, I would try to set up a new conda environment, adding all possible packages or libraries you will use and then I will make it active. Information about it can be found here: https://conda.io/projects/conda/en/latest/user-guide/tasks/manage-environments.html#activating-an-environment.
I really hope this helps. I have already had the same problem few months ago and worked for me.

import error: No module named Pandas Anaconda

I have Python2 and Python3 both installed in my laptop. I am trying to run pandas in Jupyter Notebook, but it shows an error message saying:
No module named 'pandas'
I have tried to install pandas in both python2 and python3 using:
pip3 install pandas
and
conda install pandas
both methods successfully installed the package but when I tried to import pandas, it shows the Error message again. I then tried:
!pip3 install pandas
but then it shows:
Requirement already satisfied: pandas in c:\users\fusuy\appdata\local\programs\python\python38-32\lib\site-packages (1.0.3)
Requirement already satisfied: pytz>=2017.2 in c:\users\appdata\local\programs\python\python38-32\lib\site-packages (from pandas) (2019.3)
Requirement already satisfied: python-dateutil>=2.6.1 in c:\users\appdata\local\programs\python\python38-32\lib\site-packages (from pandas) (2.8.1)
Requirement already satisfied: numpy>=1.13.3 in c:\users\appdata\local\programs\python\python38-32\lib\site-packages (from pandas) (1.18.1)
Requirement already satisfied: six>=1.5 in c:\users\appdata\local\programs\python\python38-32\lib\site-packages (from python-dateutil>=2.6.1->pandas) (1.14.0)
What should I do now?

Python is case sensitive. No module named 'Pandas' doesn't mean there is no module 'pandas'. Try: import pandas as pd. Besides that I wonder that conda install pandas was working, since your Python paths don't look like an Anaconda installation. However, if you're using conda, you first need to conda activate an environment before you can use it.

I had the same problem here.
I realize that I was trying to run the script without write python before the name script.
Beginners mistake... at least on my case

Python VS Code imports not working 'No module name requests'

I'm new to python, coming from 6 months of c++ and am also new to VS Code (from VS).
My error is>
Exception has occurred: ModuleNotFoundError
No module named 'requests'
File "C:\Users\ryanb\Documents\Python\main.py", line 1, in
import requests
on anything which begins with :
import requests
this works fine in VS, but I have been encouraged to use Code. When I ran the pip command it said 'satisified'.
PS C:\Users\ryanb\Documents\Python> pip install requests
Requirement already satisfied: requests in c:\users\ryanb\anaconda3\lib\site-packages (2.22.0)
Requirement already satisfied: idna<2.9,>=2.5 in c:\users\ryanb\anaconda3\lib\site-packages (from requests) (2.8)
Requirement already satisfied: urllib3!=1.25.0,!=1.25.1,<1.26,>=1.21.1 in c:\users\ryanb\anaconda3\lib\site-packages (from requests) (1.25.8)
Requirement already satisfied: certifi>=2017.4.17 in c:\users\ryanb\anaconda3\lib\site-packages (from requests) (2019.11.28)
Requirement already satisfied: chardet<3.1.0,>=3.0.2 in c:\users\ryanb\anaconda3\lib\site-packages (from requests) (3.0.4)
PS C:\Users\ryanb\Documents\Python>
I have anaconda, though I'm new to it as well, but I seem to get the problem either way.
Initially my problem was that it wouldn't find the interpreter but this was resolved after I installed add on files to visual studio (not visual studio code) and used the interpreter which came with that.
Please advise.
Thank you

You may have several python versions installed (e.g. 3.6 32-bit, 3.6 64-bit, 2.7, ...). I would recommend to "natively" install Python from https://www.python.org/ instead of using Anaconda. The problem can happen because VS code is using another Python, different than the one you installed requests. You can verify this if pip3 is installed: try pip3 --version. Anyway, you can change the interpreter VS code is using by clicking the lower bar: screenshot
Or you might just run pip3 install requests.
I would recommend you to leave just one Python installed in your machine.

why is the pip install process stuck on ''Installing collected packages" step?

I'm trying to pip install some python libraries in a virtual environment created by conda create, but for some packages, the installation were stuck on the step "Installing collected packages: .
Take pandas as an example:
My command and output are as follows:
pip install pandas --no-cache-dir
Collecting pandas
Downloading https://files.pythonhosted.org/packages/99/12/bf4c58eea94cea4f91ff931f284146337814fb8546e6eb0b52584446fd52/pandas-0.24.1-cp36-cp36m-macosx_10_6_intel.macosx_10_9_intel.macosx_10_9_x86_64.macosx_10_10_intel.macosx_10_10_x86_64.whl (16.3MB)
100% |████████████████████████████████| 16.3MB 11.4MB/s
Requirement already satisfied: numpy>=1.12.0 in /anaconda/envs/testctds2/lib/python3.6/site-packages (from pandas) (1.16.1)
Requirement already satisfied: pytz>=2011k in /anaconda/envs/testctds2/lib/python3.6/site-packages (from pandas) (2018.9)
Requirement already satisfied: python-dateutil>=2.5.0 in /anaconda/envs/testctds2/lib/python3.6/site-packages (from pandas) (2.8.0)
Requirement already satisfied: six>=1.5 in /anaconda/envs/testctds2/lib/python3.6/site-packages (from python-dateutil>=2.5.0->pandas) (1.12.0)
Installing collected packages: pandas
The process just hang there (at least for 30 min) until I control+z to quit (control+c got no response).
What I have tried:
conda install pandas worked well, which is also the recommended way to install pandas. I just don't understand why pip install didn't work, as it's assumed to and this situation also happened to some other libraries such as numpy, scipy, and scikit-learn.
I also tried without --no-cache-dir or -vvv to see more details, but in either case there were no more information or error code after the line "Installing collected packages: pandas"
I tried the command in a new terminal window. Magically numpy can be installed very quickly by "pip install numpy", but it didn't work with pandas or scipy.

I see this may be a problem other users are having. Here is a github link describing the same problem. There are a few others on the Conda GitHub page. Some of the answers that come from that post are:
Make sure you are up to date on your root conda environment. try: conda upgrade conda
Create a brand new virtual env
Micheal Grant, who is a Director for Technical Consulting at Anaconda replied to that thread with this:
That said, when I look at the debug output, I'm finding that it's not able to prune back the package list very well. The more "old" packages it has to consider the higher the likelihood that this kind of solver stall happens. Thankfully it is a lot less likely than it used to be.

installing tweepy on Mac using pip - error message

I have recently switched laptops from Microsoft to Apple (2015 MacBook Pro) and I have been installing python libraries such as Nlkt succesfully without any issues.
Now I have been trying to install tweepy and seem to get loads of different error messages.
After trying I pip install tweepy[error message saying "invalid syntax" in my terminal] I did some research on here and tried the below solution:
import pip
>>> package_name='tweepy'
>>> pip.main(['install',package_name])
OSError: [Errno 1] Operation not permitted: '/var/folders/t1/4g62trws5812jb97vvw5kp900000gn/T/pip-yabtGc-uninstall/System/Library/Frameworks/Python.framework/Versions/2.7/Extras/lib/python/six-1.4.1-py2.7.egg-info'
2
>>>
As you can see it is still not working...
I have also tried sudo pip install tweepy, which came up with this message:
The directory '/Users/MYNAME/Library/Caches/pip' or its parent directory is not owned by the current user and caching wheels has been disabled. check the permissions and owner of that directory. If executing pip with sudo, you may want sudo's -H flag.
Requirement already satisfied: tweepy in ./Library/Python/2.7/lib/python/site-packages
Requirement already satisfied: six>=1.7.3 in ./Library/Python/2.7/lib/python/site-packages (from tweepy)
Requirement already satisfied: requests-oauthlib>=0.4.1 in ./Library/Python/2.7/lib/python/site-packages (from tweepy)
Requirement already satisfied: requests>=2.4.3 in ./Library/Python/2.7/lib/python/site-packages (from tweepy)
Requirement already satisfied: oauthlib>=0.6.2 in ./Library/Python/2.7/lib/python/site-packages (from requests-oauthlib>=0.4.1->tweepy)
Requirement already satisfied: urllib3<1.22,>=1.21.1 in ./Library/Python/2.7/lib/python/site-packages (from requests>=2.4.3->tweepy)
Requirement already satisfied: idna<2.6,>=2.5 in ./Library/Python/2.7/lib/python/site-packages (from requests>=2.4.3->tweepy)
Requirement already satisfied: certifi>=2017.4.17 in ./Library/Python/2.7/lib/python/site-packages (from requests>=2.4.3->tweepy)
Requirement already satisfied: chardet<3.1.0,>=3.0.2 in ./Library/Python/2.7/lib/python/site-packages (from requests>=2.4.3->tweepy)
When I tried to import tweepy into idle it said "no module named tweepy"
Sorry for my longwinded explanation but I'm getting desperate...
Thank you very much for your help already!!

One solution is to use virtualenv.
In short, virtualenv creates a separate python instance in a folder different from the computers' python installation. This allows for easy installation of packages and helps you manage dependencies better than installing everything globally with pip.
How do I do this?
First, install virtualenv
$ pip install virtualenv
Next, create a virtual environment. The following command will create a python instance in a folder named "foo" in the directory you execute this from.
$ virtualenv foo
Now, whenever you need to install something, use the pip that is located at foo/bin/pip and the python located at foo/bin/python.
$ foo/bin/pip install tweepy
You can test this via the python interpreter:
$ foo/bin/python
Python 2.7.10 (default, Feb 6 2017, 23:53:20)
[GCC 4.2.1 Compatible Apple LLVM 8.0.0 (clang-800.0.34)] on darwin
Type "help", "copyright", "credits" or "license" for more information.
>>> import tweepy
Why would you want to do this?
If you use virtualenv, you are less likely to run into dependency issues.
For example, lets say you make some python program, called ProjectAAA, which uses version 1.1 of LibraryXYZ. A couple months later you want to write a new, completely unrelated python program, ProjectZZZ, which uses version 2.2.5 of that same library. When LibraryXYZ upgraded from 1.1 to 2.2.5, they removed and renamed a few classes and functions that you used in ProjectAAA. So, if you used pip and installed to the main python instance on your Mac, you won't be able to run ProjectAAA anymore, because it depends on version 1.1 but your computer has version 2.2.5.
If you used virtualenv, you could have two separate python instances, each with their own pip and their own package installations. So the environment for ProjectAAA has version 1.1, the environment for ProjectZZZ has version 2.2.5, and both can live peacefully on your computer.

I use OS X and I just successfully installed tweepy on Python IDLE using:
import pip
package_name='tweepy'
pip.main(['install',package_name])
It was pretty easy.
Thanks for the provision; now I can get on with my first extraction.

From looking at your error message, it appears you already have it.
Requirement already satisfied: tweepy in ./Library/Python/2.7/lib/python/site-packages
I tried replicating your issue (in both Python 2.7/3.5) and didn't run in to any issues and was able to import it in to IDLE.
A potential solution could be changing your PATH directory to the one that's listed in your error message.
export PYTHONPATH=$PYTHONPATH:./Library/Python/2.7/lib/python/site-packages
Another thing would be to consider using a virtual environment in the future to ensure that there is no conflict in your package installations.
Further notes: Installing Python on Mac OS X: virtualenv