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pip install flask-scaffold but having trouble downloading psycopg2-2.6

I have problems when I try pip install flask-scaffold
installing flask-scaffold. But having trouble downloading psycopg2-2.6, and I am using a virtualenv. Any help is welcome, thanks.
Collecting psycopg2==2.6
Using cached psycopg2-2.6.tar.gz (367 kB)
ERROR: Command errored out with exit status 1:
command: 'd:\python\python.exe' -c 'import sys, setuptools, tokenize; sys.argv[0] = '"'"'C:\\Users\\86131\\AppData\\Local\\Temp\\pip-install-kwovtp
7e\\psycopg2\\setup.py'"'"'; __file__='"'"'C:\\Users\\86131\\AppData\\Local\\Temp\\pip-install-kwovtp7e\\psycopg2\\setup.py'"'"';f=getattr(tokenize, '"'
"'open'"'"', open)(__file__);code=f.read().replace('"'"'\r\n'"'"', '"'"'\n'"'"');f.close();exec(compile(code, __file__, '"'"'exec'"'"'))' egg_info --egg
-base 'C:\Users\86131\AppData\Local\Temp\pip-pip-egg-info-8deozwr4'
cwd: C:\Users\86131\AppData\Local\Temp\pip-install-kwovtp7e\psycopg2\
Complete output (14 lines):
running egg_info
creating C:\Users\86131\AppData\Local\Temp\pip-pip-egg-info-8deozwr4\psycopg2.egg-info
writing C:\Users\86131\AppData\Local\Temp\pip-pip-egg-info-8deozwr4\psycopg2.egg-info\PKG-INFO
writing dependency_links to C:\Users\86131\AppData\Local\Temp\pip-pip-egg-info-8deozwr4\psycopg2.egg-info\dependency_links.txt
writing top-level names to C:\Users\86131\AppData\Local\Temp\pip-pip-egg-info-8deozwr4\psycopg2.egg-info\top_level.txt
writing manifest file 'C:\Users\86131\AppData\Local\Temp\pip-pip-egg-info-8deozwr4\psycopg2.egg-info\SOURCES.txt'
Error: pg_config executable not found.
Please add the directory containing pg_config to the PATH
or specify the full executable path with the option:
python setup.py build_ext --pg-config /path/to/pg_config build ...
or with the pg_config option in 'setup.cfg'.
----------------------------------------
ERROR: Command errored out with exit status 1: python setup.py egg_info Check the logs for full command output.

pg_config is in postgresql-devel (libpq-dev in Debian/Ubuntu, libpq-devel on Centos/Fedora/Cygwin/Babun.)
try this:
sudo apt-get install libpq-dev python-dev
or
try to install brew install postgresql

Cannot install psycopg2 with pip3 on M1 Mac

I cannot install psycopg2 on my M1 Mac and I used pip3.
When I tried to install with pip3 install psycopg2 The output like that:
ERROR: Command errored out with exit status 1:
command: /opt/homebrew/opt/python#3.9/bin/python3.9 -c 'import sys, setuptools, tokenize; sys.argv[0] = '"'"'/private/var/folders/m5/vhnyyjg16gd352x6wdhpjysh0000gn/T/pip-install-9wiqe2nr/psycopg2_147a5ae8fd5a47079480274f4225edbf/setup.py'"'"'; __file__='"'"'/private/var/folders/m5/vhnyyjg16gd352x6wdhpjysh0000gn/T/pip-install-9wiqe2nr/psycopg2_147a5ae8fd5a47079480274f4225edbf/setup.py'"'"';f=getattr(tokenize, '"'"'open'"'"', open)(__file__);code=f.read().replace('"'"'\r\n'"'"', '"'"'\n'"'"');f.close();exec(compile(code, __file__, '"'"'exec'"'"'))' egg_info --egg-base /private/var/folders/m5/vhnyyjg16gd352x6wdhpjysh0000gn/T/pip-pip-egg-info-06hnnl2t
cwd: /private/var/folders/m5/vhnyyjg16gd352x6wdhpjysh0000gn/T/pip-install-9wiqe2nr/psycopg2_147a5ae8fd5a47079480274f4225edbf/
Complete output (23 lines):
running egg_info
creating /private/var/folders/m5/vhnyyjg16gd352x6wdhpjysh0000gn/T/pip-pip-egg-info-06hnnl2t/psycopg2.egg-info
writing /private/var/folders/m5/vhnyyjg16gd352x6wdhpjysh0000gn/T/pip-pip-egg-info-06hnnl2t/psycopg2.egg-info/PKG-INFO
writing dependency_links to /private/var/folders/m5/vhnyyjg16gd352x6wdhpjysh0000gn/T/pip-pip-egg-info-06hnnl2t/psycopg2.egg-info/dependency_links.txt
writing top-level names to /private/var/folders/m5/vhnyyjg16gd352x6wdhpjysh0000gn/T/pip-pip-egg-info-06hnnl2t/psycopg2.egg-info/top_level.txt
writing manifest file '/private/var/folders/m5/vhnyyjg16gd352x6wdhpjysh0000gn/T/pip-pip-egg-info-06hnnl2t/psycopg2.egg-info/SOURCES.txt'
Error: pg_config executable not found.
pg_config is required to build psycopg2 from source. Please add the directory
containing pg_config to the $PATH or specify the full executable path with the
option:
python setup.py build_ext --pg-config /path/to/pg_config build ...
or with the pg_config option in 'setup.cfg'.
If you prefer to avoid building psycopg2 from source, please install the PyPI
'psycopg2-binary' package instead.
For further information please check the 'doc/src/install.rst' file (also at
<https://www.psycopg.org/docs/install.html>).
----------------------------------------
WARNING: Discarding https://files.pythonhosted.org/packages/fd/ae/98cb7a0cbb1d748ee547b058b14604bd0e9bf285a8e0cc5d148f8a8a952e/psycopg2-2.8.6.tar.gz#sha256=fb23f6c71107c37fd667cb4ea363ddeb936b348bbd6449278eb92c189699f543 (from https://pypi.org/simple/psycopg2/) (requires-python:>=2.7,!=3.0.*,!=3.1.*,!=3.2.*,!=3.3.*). Command errored out with exit status 1: python setup.py egg_info Check the logs for full command output.
Using cached psycopg2-2.8.5.tar.gz (380 kB)
ERROR: Command errored out with exit status 1:
command: /opt/homebrew/opt/python#3.9/bin/python3.9 -c 'import sys, setuptools, tokenize; sys.argv[0] = '"'"'/private/var/folders/m5/vhnyyjg16gd352x6wdhpjysh0000gn/T/pip-install-9wiqe2nr/psycopg2_97efcf6747c249769acdc8430ba4238f/setup.py'"'"'; __file__='"'"'/private/var/folders/m5/vhnyyjg16gd352x6wdhpjysh0000gn/T/pip-install-9wiqe2nr/psycopg2_97efcf6747c249769acdc8430ba4238f/setup.py'"'"';f=getattr(tokenize, '"'"'open'"'"', open)(__file__);code=f.read().replace('"'"'\r\n'"'"', '"'"'\n'"'"');f.close();exec(compile(code, __file__, '"'"'exec'"'"'))' egg_info --egg-base /private/var/folders/m5/vhnyyjg16gd352x6wdhpjysh0000gn/T/pip-pip-egg-info-ap2am61r
cwd: /private/var/folders/m5/vhnyyjg16gd352x6wdhpjysh0000gn/T/pip-install-9wiqe2nr/psycopg2_97efcf6747c249769acdc8430ba4238f/
Complete output (23 lines):
running egg_info
creating /private/var/folders/m5/vhnyyjg16gd352x6wdhpjysh0000gn/T/pip-pip-egg-info-ap2am61r/psycopg2.egg-info
writing /private/var/folders/m5/vhnyyjg16gd352x6wdhpjysh0000gn/T/pip-pip-egg-info-ap2am61r/psycopg2.egg-info/PKG-INFO
writing dependency_links to /private/var/folders/m5/vhnyyjg16gd352x6wdhpjysh0000gn/T/pip-pip-egg-info-ap2am61r/psycopg2.egg-info/dependency_links.txt
writing top-level names to /private/var/folders/m5/vhnyyjg16gd352x6wdhpjysh0000gn/T/pip-pip-egg-info-ap2am61r/psycopg2.egg-info/top_level.txt
writing manifest file '/private/var/folders/m5/vhnyyjg16gd352x6wdhpjysh0000gn/T/pip-pip-egg-info-ap2am61r/psycopg2.egg-info/SOURCES.txt'
Error: pg_config executable not found.
pg_config is required to build psycopg2 from source. Please add the directory
containing pg_config to the $PATH or specify the full executable path with the
option:
python setup.py build_ext --pg-config /path/to/pg_config build ...
or with the pg_config option in 'setup.cfg'.
If you prefer to avoid building psycopg2 from source, please install the PyPI
'psycopg2-binary' package instead.
For further information please check the 'doc/src/install.rst' file (also at
<https://www.psycopg.org/docs/install.html>).
==============================================================================
Its beginning of the error, After that its tried to install each previous version of Psycopg
==============================================================================
Also, I tried to install with source code with :
git clone https://github.com/psycopg/psycopg2.git
cd psycopg2
python3 setup.py build
Its return as error like that:
running build
running build_py
running build_ext
Error: pg_config executable not found.
pg_config is required to build psycopg2 from source. Please add the directory
containing pg_config to the $PATH or specify the full executable path with the
option:
python setup.py build_ext --pg-config /path/to/pg_config build ...
or with the pg_config option in 'setup.cfg'.
If you prefer to avoid building psycopg2 from source, please install the PyPI
'psycopg2-binary' package instead.
For further information please check the 'doc/src/install.rst' file (also at
<https://www.psycopg.org/docs/install.html>).
Also
python3 setup.py build
return the same error as python3 setup.py build
How can I install it?

try this:
brew install libpq --build-from-source
brew install openssl
export LDFLAGS="-L/opt/homebrew/opt/openssl#1.1/lib -L/opt/homebrew/opt/libpq/lib"
export CPPFLAGS="-I/opt/homebrew/opt/openssl#1.1/include -I/opt/homebrew/opt/libpq/include"
pip3 install psycopg2

Before reverting to any of the older answers, I would recommend trying the following:
Install Postgres using brew install postgres, then pip3 install psycopg2.
Worked on Mac M1, Monterey, Python 3.9.
Thanks to Kori Vernon.

Thanks to active development, now there is a new release of psycopg2 as well as psycopg2-binary which is compatible with M1 devices.
Ver. 2.9.1 works smooth. Tried and tested
Reference - https://github.com/psycopg/psycopg2/issues/1200

Following this steps solved my problem:
❯ brew install postgresql#14
# If you open a new terminal tab you will see that pg_config is available
❯ export CPPFLAGS="-I/opt/homebrew/opt/openssl#1.1/include"
❯ export LDFLAGS="-L/opt/homebrew/opt/openssl#1.1/lib -L${HOME}/.pyenv/versions/3.10.7/lib" # use your current python version
❯ python -V
Python 3.10.7 # make sure it matches the same above configuration
❯ pip install psycopg2-binary==2.8.5

Unable to install psycopg2 2.8.6 on Windows

I am unable to install psycopg2 2.8.6 or psycopg2-binary on my Windows.
While installing I am getting below error.
PS C:\Users\UserName\Desktop\PythonUnitTestFW> pip install psycopg2-binary
Collecting psycopg2-binary
Using cached psycopg2-binary-2.8.6.tar.gz (384 kB)
ERROR: Command errored out with exit status 1:
command: 'c:\python39\python.exe' -c 'import sys, setuptools, tokenize; sys.argv[0] = '"'"'C:\Users\UserName\AppData\Local\Temp\pip-install-e12d1gsx\psycopg2-binary\setup.py'"'"'; file='"'"'C:\Users\UserName\AppData\Local\Temp\pip-install-e12d1gsx\psycopg2-binary\setup.py'"'"';f=getattr(tokenize, '"'"'open'"'"', open)(file);code=f.read().replace('"'"'\r\n'"'"', '"'"'\n'"'"');f.close();exec(compile(code, file, '"'"'exec'"'"'))' egg_info --egg-base 'C:\Users\UserName\AppData\Local\Temp\pip-pip-egg-info-bs6x9b8l'
cwd: C:\Users\UserName\AppData\Local\Temp\pip-install-e12d1gsx\psycopg2-binary
Complete output (23 lines):
running egg_info
creating C:\Users\UserName\AppData\Local\Temp\pip-pip-egg-info-bs6x9b8l\psycopg2_binary.egg-info
writing C:\Users\UserName\AppData\Local\Temp\pip-pip-egg-info-bs6x9b8l\psycopg2_binary.egg-info\PKG-INFO
writing dependency_links to C:\Users\UserName\AppData\Local\Temp\pip-pip-egg-info-bs6x9b8l\psycopg2_binary.egg-info\dependency_links.txt
writing top-level names to C:\Users\UserName\AppData\Local\Temp\pip-pip-egg-info-bs6x9b8l\psycopg2_binary.egg-info\top_level.txt
writing manifest file 'C:\Users\UserName\AppData\Local\Temp\pip-pip-egg-info-bs6x9b8l\psycopg2_binary.egg-info\SOURCES.txt'
Error: pg_config executable not found.
pg_config is required to build psycopg2 from source. Please add the directory
containing pg_config to the $PATH or specify the full executable path with the
option:
python setup.py build_ext --pg-config /path/to/pg_config build ...
or with the pg_config option in 'setup.cfg'.
If you prefer to avoid building psycopg2 from source, please install the PyPI
'psycopg2-binary' package instead.
For further information please check the 'doc/src/install.rst' file (also at
<https://www.psycopg.org/docs/install.html>).
----------------------------------------
ERROR: Command errored out with exit status 1: python setup.py egg_info Check the logs for full command output.

Docker build getting errors after I tried to install pip install -r requirements.txt file [duplicate]

This question already has answers here:
Error: pg_config executable not found when installing psycopg2 on Alpine in Docker
(5 answers)
Closed 2 years ago.
This is the error I get after I installed
RUN pip install -r requirements.txt
RROR: Service 'web' failed to build: The command '/bin/sh -c pip install -r requirements.txt' returned a non-zero code: 1
➜ django-docker pip install psycopg2
Defaulting to user installation because normal site-packages is not writeable
Collecting psycopg2
Using cached psycopg2-2.8.6.tar.gz (383 kB)
ERROR: Command errored out with exit status 1:
command: /usr/bin/python3.6 -c 'import sys, setuptools, tokenize; sys.argv[0] = '"'"'/tmp/pip-install-7xuxd9cm/psycopg2/setup.py'"'"'; file='"'"'/tmp/pip-install-7xuxd9cm/psycopg2/setup.py'"'"';f=getattr(tokenize, '"'"'open'"'"', open)(file);code=f.read().replace('"'"'\r\n'"'"', '"'"'\n'"'"');f.close();exec(compile(code, file, '"'"'exec'"'"'))' egg_info --egg-base /tmp/pip-pip-egg-info-uon18vv4
cwd: /tmp/pip-install-7xuxd9cm/psycopg2/
Complete output (23 lines):
running egg_info
creating /tmp/pip-pip-egg-info-uon18vv4/psycopg2.egg-info
writing /tmp/pip-pip-egg-info-uon18vv4/psycopg2.egg-info/PKG-INFO
writing dependency_links to /tmp/pip-pip-egg-info-uon18vv4/psycopg2.egg-info/dependency_links.txt
writing top-level names to /tmp/pip-pip-egg-info-uon18vv4/psycopg2.egg-info/top_level.txt
writing manifest file '/tmp/pip-pip-egg-info-uon18vv4/psycopg2.egg-info/SOURCES.txt'
Error: pg_config executable not found.
pg_config is required to build psycopg2 from source. Please add the directory
containing pg_config to the $PATH or specify the full executable path with the
option:
python setup.py build_ext --pg-config /path/to/pg_config build ...
or with the pg_config option in 'setup.cfg'.
If you prefer to avoid building psycopg2 from source, please install the PyPI
'psycopg2-binary' package instead.
For further information please check the 'doc/src/install.rst' file (also at
<https://www.psycopg.org/docs/install.html>).
----------------------------------------
ERROR: Command errored out with exit status 1: python setup.py egg_info Check the logs for full command output.

The error could be caused by the wrong operator on psycopy2-binary>==2.8 which according to pip docs should be >= and not >==
This might cause an error in parsing the requirements file.

How to use pip install while activating virtual environment in python

I've installed a separated python version and activated virtual environment based on it , on CentOs7 when i use the pip install method from offline packages i got this error :
ERROR: Command errored out with exit status 127:
command: /home/awagdy/Documents/reporter-web/venv/bin/python3.7 -c 'import sys, setuptools, tokenize; sys.argv[0] = '"'"'/tmp/pip-install-jlfbivgb/Django/setup.py'"'"'; __file__='"'"'/tmp/pip-install-jlfbivgb/Django/setup.py'"'"';f=getattr(tokenize, '"'"'open'"'"', open)(__file__);code=f.read().replace('"'"'\r\n'"'"', '"'"'\n'"'"');f.close();exec(compile(code, __file__, '"'"'exec'"'"'))' egg_info --egg-base pip-egg-info
cwd: /tmp/pip-install-jlfbivgb/Django/
Complete output (1 lines):
/home/awagdy/Documents/reporter-web/venv/bin/python3.7: error while loading shared libraries: libpython3.7m.so.1.0: cannot open shared object file: No such file or directory
----------------------------------------
ERROR: Command errored out with exit status 127: python setup.py egg_info Check the logs for full command output.
I'm installing from a folder that contains the needed packages downloaded using the command pip download , then installing them offline using pip install -r requirements.txt --no--index --find-links=pkgs

The link below, the person suggests using
easy_install when installing python packages in a virtual environment
example

Using this command helped path/to/python/python3.6 -m pip install -r requirements.txt --no-index --find-links=path/to/pkgs