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Unable to install pylint with pip in python 3.9

I am starting to use VS Code, but pylint is not installed and it gives me an error.
I try to install pylint using pip, but it gives me an error code.
Collecting pylint
Using cached pylint-2.6.0-py3-none-any.whl (325 kB)
Collecting astroid<=2.5,>=2.4.0
Using cached astroid-2.4.2-py3-none-any.whl (213 kB)
Collecting colorama
Using cached colorama-0.4.4-py2.py3-none-any.whl (16 kB)
Collecting isort<6,>=4.2.5
Using cached isort-5.6.4-py3-none-any.whl (98 kB)
Collecting lazy-object-proxy==1.4.*
Using cached lazy-object-proxy-1.4.3.tar.gz (34 kB)
Installing build dependencies ... done
Getting requirements to build wheel ... done
Preparing wheel metadata ... done
WARNING: Requested lazy-object-proxy==1.4.* from https://files.pythonhosted.org/packages/07/3f/a3d687f83c7d44970f70ff0400677746c8860b11f0c08f6b4e07205f0cdc/lazy-object-proxy-1.4.3.tar.gz#sha256=f3900e8a5de27447acbf900b4750b0ddfd7ec1ea7fbaf11dfa911141bc522af0 (from astroid<=2.5,>=2.4.0->pylint), but installing version 0.0.0
ERROR: Requested lazy-object-proxy==1.4.* from https://files.pythonhosted.org/packages/07/3f/a3d687f83c7d44970f70ff0400677746c8860b11f0c08f6b4e07205f0cdc/lazy-object-proxy-1.4.3.tar.gz#sha256=f3900e8a5de27447acbf900b4750b0ddfd7ec1ea7fbaf11dfa911141bc522af0 (from astroid<=2.5,>=2.4.0->pylint) has different version in metadata: '0.0.0'```

This is a bug of pip for now, see https://github.com/pypa/pip/issues/9203. The pip does something wrong in its package-dependencies handling. And there is a workaround listed in this issue, use --use-deprecated=legacy-resolver. And be noted: This will work until we release pip 21.0.
So run pip install --use-deprecated=legacy-resolver pylint will resolve this problem. This works for me on win10, finally I got lazy-object-proxy 0.0.0 and pylint 2.6.0 installed, though 0.0.0 is kinda weird.

I had the same issues with Python 3.9 & Pylint.
Even when I tried the answers given here, nothing worked. I kept on getting Error messages.
All my issues where fixed by doing the following:
Uninstalled Python 3.9.1
Installed Python 3.7.9 - (Remember to click the box add to PATH)
Verifying Python Installation:
3.1 python --version, This should give you Python 3.7.9
If it doesn't and you get an Error, you need to configure your PATH, here is a video on how to fix that:
https://www.youtube.com/watch?v=vWxQG70GqT4&list=PL914uJ85wHwJ4WYvHEhPHSgG2oyi7Azat&index=11&ab_channel=KyleCook
Verifying pip Installation:
4.1 pip --version (I got another Error here again)
i.e.: ModuleNotFoundError: No module named 'pip' python3
I fixed that by:
4.1.1 python -m ensurepip
4.1.2 python -m pip install --upgrade pip
Ref: ModuleNotFoundError: No module named 'pip' python3
Install Pylint for Python 3.6+:
5.1 pip install pylint --upgrade
Ref: https://pypi.org/project/pylint/
This worked for me.

After installing wheel and httplib2 library I cannot import httplib2 in my code

What is my mistake?
Opened command line and installed
C:\Users\Caro Schor>pip install httplib2
Requirement already satisfied: httplib2 in c:\users\caro schor\appdata\local\packages\pythonsoftwarefoundation.python.3.8_qbz5n2kfra8p0\localcache\local-packages\python38\site-packages (0.17.3)
Could not build wheels for httplib2, since package 'wheel' is not installed.
Could not install the wheel and could not import httplib2.
Then I installed
C:\Users\Caro Schor>python -m pip install wheel
Collecting wheel
Downloading wheel-0.34.2-py2.py3-none-any.whl (26 kB)
Installing collected packages: wheel
WARNING: The script wheel.exe is installed in 'C:\Users\Caro Schor\AppData\Local\Packages\PythonSoftwareFoundation.Python.3.8_qbz5n2kfra8p0\LocalCache\local-packages\Python38\Scripts' which is not on PATH.
Consider adding this directory to PATH or, if you prefer to suppress this warning, use --no-warn-script-location.
Successfully installed wheel-0.34.2
However, I still can not import the httplib2 library.
Would need a detailed description of what I need to do differently since I am a beginner with Python.

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.

Error: Failed building wheel for wxpython-phoenix while installing wx

I am trying to install wxpython (I have python 3.5.2(32Bit) and Windows 10(64Bit))
I tried :pip install wx and i get: Failed building wheel for wxpython-phoenix 2 times and then a big error line-->
I also tried installing Anaconda, but it did not help.How can I overcome the problem ?

There's a lot of questions about failed installations on windows, probably because the packages are compiled when installed, and sometimes the compilation fail when the compiler is not properly configured. I admit I decided to let the specialized people handle it.
As a nice workaround, you can grab the already built distribution at the official wxpython website located here:
Python 3.5 32/64 bit windows:
https://wxpython.org/Phoenix/snapshot-builds/wxPython_Phoenix-3.0.3.dev2700+c524ed1-cp35-cp35m-win_amd64.whl
https://wxpython.org/Phoenix/snapshot-builds/wxPython_Phoenix-3.0.3.dev2700+c524ed1-cp35-cp35m-win32.whl
just download the .whl file and do for example:
C:\python35\scripts\pip install wxPython_Phoenix-3.0.3.dev2700+c524ed1-cp35-cp35m-win_amd64.whl

For linux you need to go here first
https://extras.wxpython.org/wxPython4/extras/linux/gtk3/
Then grab your linux version and do the install.
(base) fsdfsdfd#linux:~/Downloads$ pip install wxPython-4.1.1-cp38-cp38-linux_x86_64.whl
Processing ./wxPython-4.1.1-cp38-cp38-linux_x86_64.whl
Requirement already satisfied: pillow in /home/orangel/miniconda3/lib/python3.8/site-packages (from wxPython==4.1.1) (8.1.2)
Requirement already satisfied: numpy; python_version >= "3.0" in /home/orangel/miniconda3/lib/python3.8/site-packages (from wxPython==4.1.1) (1.20.1)
Requirement already satisfied: six in /home/orangel/miniconda3/lib/python3.8/site-packages (from wxPython==4.1.1) (1.15.0)
Installing collected packages: wxPython
Successfully installed wxPython-4.1.1
if does not works, please try this
sudo apt install libwxgtk3.0-gtk3-dev

Installing Fuel (Machine Learning) using pip on Ubuntu 14.04.02

When installing the Fuel machine learning library, I got stuck with some dependencies issues:
alvas#ubi:~$ pip install --upgrade git+git://github.com/mila-udem/fuel.gitYou are using pip version 7.1.0, however version 7.1.2 is available.
You should consider upgrading via the 'pip install --upgrade pip' command.
Collecting git+git://github.com/mila-udem/fuel.git
Cloning git://github.com/mila-udem/fuel.git to /tmp/pip-xUlqCT-build
/usr/local/lib/python2.7/dist-packages/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
Collecting numpy (from fuel==0.0.1)
Requirement already up-to-date: six in /usr/local/lib/python2.7/dist-packages (from fuel==0.0.1)
Collecting picklable-itertools (from fuel==0.0.1)
Downloading picklable-itertools-0.1.1.tar.gz
Collecting pyyaml (from fuel==0.0.1)
Downloading PyYAML-3.11.tar.gz (248kB)
100% |████████████████████████████████| 249kB 612kB/s
Collecting h5py (from fuel==0.0.1)
Downloading h5py-2.5.0.tar.gz (684kB)
100% |████████████████████████████████| 688kB 398kB/s
Collecting tables (from fuel==0.0.1)
Downloading tables-3.2.2.tar.gz (7.0MB)
100% |████████████████████████████████| 7.0MB 73kB/s
Complete output from command python setup.py egg_info:
/usr/bin/ld: cannot find -lhdf5
collect2: error: ld returned 1 exit status
* Using Python 2.7.6 (default, Jun 22 2015, 17:58:13)
* USE_PKGCONFIG: True
.. ERROR:: Could not find a local HDF5 installation.
You may need to explicitly state where your local HDF5 headers and
library can be found by setting the ``HDF5_DIR`` environment
variable or by using the ``--hdf5`` command-line option.
----------------------------------------
Command "python setup.py egg_info" failed with error code 1 in /tmp/pip-build-wMS1d3/tables
Then after I have done (Installing h5py on an Ubuntu server):
sudo apt-get install libhdf5-dev
sudo HDF5_DIR=/usr/lib/x86_64-linux-gnu/hdf5/serial/ pip install h5py
And then I had to also update my cython with:
sudo pip install cython
My question is not about how to fix the installation issues but what does this command mean?
sudo HDF5_DIR=/usr/lib/x86_64-linux-gnu/hdf5/serial/ pip install h5py
What does specifying the HDF5_DIR do?
Why didn't the fuel dependencies automatically install from the:
https://github.com/mila-udem/fuel/blob/master/requirements.txt
https://github.com/mila-udem/fuel/blob/master/setup.py
What should I do to update the setup.py from fuel so that it can automatically pip install the dependencies?

You do not need to make any modifications to the setup.py from fuel. Just make sure HDF5_DIR is set correctly before updating the lib.
Explanations:
If you look at your error log, you can see that it fails at installing the h5py python lib that is a dependency of fuel. It also tells you why it failed at the end, basically it is because h5py use the C library hdf5 and it needs the headers of this lib to use it.
So the sudo apt-get install libhdf5-dev that you executed is to install the development version of this C library (you can gess that by the -dev). The dev versions install the headers of the lib and not just the compiled lib.
Then, the HDF5_DIR env variable is nedded to tell h5py setup where to find those headers.
So if you whant to update the fuel lib next time, make sure that the HDF5_DIR is set correctly and then it will update its dependencies (including h5py).