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Multiple packages cannot install on PyCharm

I am trying to use PyCharm for my python 3 coding on my Linux, and it works great 90% of the time, but I notice that on occasion I cannot import certain packages. For example, when I click Settings->Project->Python Interpreter and try to install 'opencv-python', I get this error:
AttributeError: module 'setuptools.build_meta' has no attribute '__legacy__'
When I try to install opencv-python with pip I get this message:
$ pip install opencv-python
Defaulting to user installation because normal site-packages is not writeable
Requirement already satisfied: opencv-python in ./.local/lib/python3.6/site-packages (4.5.1.48)
Requirement already satisfied: numpy>=1.13.3 in ./.local/lib/python3.6/site-packages (from opencv-python) (1.19.2)
There seems to be some discrepency between the packages my computer has installed and the packages that PyCharm has installed. How can I solve this problem?

Having trouble installing PyTorch

I'm having trouble installing PyTorch.
C:\Users\myself>pip install torch
Collecting torch
Using cached torch-1.7.1-cp38-cp38-win_amd64.whl (184.0 MB)
Requirement already satisfied: numpy in c:\users\myself\appdata\local\packages\pythonsoftwarefoundation.python.3.8_qbz5n2kfra8p0\localcache\local-packages\python38\site-packages (from torch) (1.19.1)
Requirement already satisfied: typing-extensions in c:\users\myself\appdata\local\packages\pythonsoftwarefoundation.python.3.8_qbz5n2kfra8p0\localcache\local-packages\python38\site-packages (from torch) (3.7.4.3)
Installing collected packages: torch
ERROR: Could not install packages due to an EnvironmentError: [Errno 2] No such file or directory: 'C:\\Users\\myself\\AppData\\Local\\Packages\\PythonSoftwareFoundation.Python.3.8_qbz5n2kfra8p0\\LocalCache\\local-packages\\Python38\\site-packages\\caffe2\\python\\serialized_test\\data\\operator_test\\learning_rate_adaption_op_test.test_learning_rate_adaption_op_normalization.zip'
WARNING: You are using pip version 20.2.4; however, version 20.3.3 is available.
You should consider upgrading via the 'C:\Users\myself\AppData\Local\Microsoft\WindowsApps\PythonSoftwareFoundation.Python.3.8_qbz5n2kfra8p0\python.exe -m pip install --upgrade pip' command.
It says that I'm missing a file in caffe2, but I'm not sure how I can get that file back.

Torch wheel contains caffe2 directory.
1.Try --no-cache-dir option
pip install --no-cache-dir torch
2. Removing the MAX_PATH Limitation
See here 3. Using Python on Windows — Python 3.7.9 documentation. You can find some more detailed discussion here.

Python no module named 'requests' even install requests

I run my python scrapy project shows the error no module named 'requests'
So I type pip install requests
and then terminal information:
Requirement already satisfied: requests in ./Library/Python/2.7/lib/python/site-packages (2.22.0)
Requirement already satisfied: chardet<3.1.0,>=3.0.2 in ./Library/Python/2.7/lib/python/site-packages (from requests) (3.0.4)
Requirement already satisfied: idna<2.9,>=2.5 in ./Library/Python/2.7/lib/python/site-packages (from requests) (2.8)
Requirement already satisfied: urllib3!=1.25.0,!=1.25.1,<1.26,>=1.21.1 in ./Library/Python/2.7/lib/python/site-packages (from requests) (1.25.7)
Requirement already satisfied: certifi>=2017.4.17 in ./Library/Python/2.7/lib/python/site-packages (from requests) (2019.11.28)
type command pip list can see request 2.22.0
I type command python --version to check the python version:
python 2.7.16
Finally I run my scrapy project again still see the same error no module named 'requests'
I have no idea how to fix the error now, any help would be appreciated. Thanks.

Install python3 and pip3 and then pip3 install requests
if you are on ubuntu python3 is installed by default
you should first install pip3 by apt install python3-pip and then pip3 install requests

If you are using two different versions of Python, it should explain why you can't use your module.
To install the module on Python 3, try:
pip3 install requests
And make sure, you are using the correct version.

Check if you are using the same interpreter to which you have installed the package using pip install. As a best practice to avoid this type of issues when you have multiple versions of python, use pip as a module instead of directly calling pip.
eg:
python -m pip install requests
python3 -m pip install requests

pip install tweepy on mac is not working

These are the versions that I am working with
$ python --version
Python 2.7.10
$ pip --version
pip 9.0.1 from /Library/Python/2.7/site-packages (python 2.7)
Ideally I should be able to install tweepy. But that is not happening.
$ pip install tweepy
Collecting tweepy
Using cached tweepy-3.5.0-py2.py3-none-any.whl
Collecting six>=1.7.3 (from tweepy)
Using cached six-1.10.0-py2.py3-none-any.whl
Requirement already satisfied: requests>=2.4.3 in /Library/Python/2.7/site-packages (from tweepy)
Requirement already satisfied: requests-oauthlib>=0.4.1 in /Library/Python/2.7/site-packages (from tweepy)
Requirement already satisfied: oauthlib>=0.6.2 in /Library/Python/2.7/site-packages (from requests-oauthlib>=0.4.1->tweepy)
Installing collected packages: six, tweepy
Found existing installation: six 1.4.1
DEPRECATION: Uninstalling a distutils installed project (six) has been deprecated and will be removed in a future version. This is due to the fact that uninstalling a distutils project will only partially uninstall the project.
Uninstalling six-1.4.1:
Exception:
Traceback (most recent call last):
File "/Library/Python/2.7/site-packages/pip/basecommand.py", line 215, in main
status = self.run(options, args)
A bunch of lines deleted for brevity. It finally ends at ...
File "/System/Library/Frameworks/Python.framework/Versions/2.7/lib/python2.7/shutil.py", line 103, in copystat
os.chflags(dst, st.st_flags)
OSError: [Errno 1] Operation not permitted: '/tmp/pip-CBvMLu-uninstall/System/Library/Frameworks/Python.framework/Versions/2.7/Extras/lib/python/six-1.4.1-py2.7.egg-info'
Can anyone help?
Update Tried the following as well. But did not solve the problem
$ sudo -H pip install tweepy

Install it with:
sudo pip install tweepy
Looks like a permission problem :)

I got the same problem. The way I solved it was to download python 2.7.13 from the official website and install it. After that, I installed pip with:
sudo easy_install pip
And after that:
pip install tweepy
Hope it is still relevant :)

python-Can't use modules installed by Homebrew?

I want to use the essentia module in my python virtualenv and the version of python is 2.7.6.
After I executed
brew tap MTG/essentia
I can't find this module in my Pycharm.
I've also tried to install other package such as matplotlib using
sudo pip install matplotlib
under my virtualenv path.
The directory '/Users/username/Library/Caches/pip/http' or its parent directory is not owned by the current user and the cache has been disabled. Please check the permissions and owner of that directory. If executing pip with sudo, you may want sudo's -H flag.
The directory '/Users/username/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 (use --upgrade to upgrade): matplotlib in /System/Library/Frameworks/Python.framework/Versions/2.7/Extras/lib/python
Requirement already satisfied (use --upgrade to upgrade): numpy>=1.5 in /System/Library/Frameworks/Python.framework/Versions/2.7/Extras/lib/python (from matplotlib)
Requirement already satisfied (use --upgrade to upgrade): python-dateutil in /System/Library/Frameworks/Python.framework/Versions/2.7/Extras/lib/python (from matplotlib)
Requirement already satisfied (use --upgrade to upgrade): tornado in /Library/Python/2.7/site-packages (from matplotlib)
Requirement already satisfied (use --upgrade to upgrade): pyparsing>=1.5.6 in /System/Library/Frameworks/Python.framework/Versions/2.7/Extras/lib/python (from matplotlib)
Collecting nose (from matplotlib)
/Library/Python/2.7/site-packages/pip-7.1.2-py2.7.egg/pip/_vendor/requests/packages/urllib3/util/ssl_.py:90: InsecurePlatformWarning: A true SSLContext object is not available. This prevents urllib3 from configuring SSL appropriately and may cause certain SSL connections to fail. For more information, see https://urllib3.readthedocs.org/en/latest/security.html#insecureplatformwarning.
InsecurePlatformWarning
Downloading nose-1.3.7-py2-none-any.whl (154kB)
100% |████████████████████████████████| 155kB 46kB/s
Requirement already satisfied (use --upgrade to upgrade): backports.ssl-match-hostname in /Library/Python/2.7/site-packages (from tornado->matplotlib)
Requirement already satisfied (use --upgrade to upgrade): singledispatch in /Library/Python/2.7/site-packages (from tornado->matplotlib)
Requirement already satisfied (use --upgrade to upgrade): certifi in /Library/Python/2.7/site-packages (from tornado->matplotlib)
Requirement already satisfied (use --upgrade to upgrade): backports-abc>=0.4 in /Library/Python/2.7/site-packages (from tornado->matplotlib)
Requirement already satisfied (use --upgrade to upgrade): six in /System/Library/Frameworks/Python.framework/Versions/2.7/Extras/lib/python (from singledispatch->tornado->matplotlib)
Installing collected packages: nose
Successfully installed nose-1.3.7
You are using pip version 7.1.2, however version 8.0.2 is available.
You should consider upgrading via the 'pip install --upgrade pip' command.
I checked in Pycharm, however, in the interpreter there was no matplotlib module.
How can I install packages in my virtualenv?

If the pip package is not available, you can find the brew installation in your local python directory.
Quick Fix:
Install essentia to your local environment.
Append the local essentia package to your virtual environment
sys.path.append('/usr/local/lib/python2.7/site-packages')
import essentia
Long Fix:
If you want to fully contain the packages in your virtual environment, try copying the local site-packages/essentia folder to your virtual environment
Copy over any other dependencies such as site-packages/numpy. Check brew's Cellar (/usr/local/Cellar) for other dependencies

You should not install python modules with brew, instead you should use pip. The following method has worked for me in OSX.
Desktop $ virtualenv myproject # Create the virtual environment
Desktop $ cd myproject # Change into that directory
Desktop $ source bin/activate # Enter the virtual environment
(myproject) $ sudo pip install matplotlib # Install matplotlib
(myproject) $ deactivate # Exit from the virtual environment
Look here for a further explanation of virtualenv.