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I have Python 2.6 in my Linux rhel-5. I have installed pip and required CFFI packages. When I try to run a sample CFFI program:
ffi = FFI()
it says:
File "/usr/lib/python2.6/site-packages/cffi/api.py", line 56, in __init__
import _cffi_backend as backend
ImportError: No module named _cffi_backend
What could be the possible error? Did I miss something during installation? I have installed pip, wheel, pycparser, pytest and cffi.
For python2.x use following command:
python -m pip install cffi
for python3.x
python3 -m pip install cffi
I needed to uninstall and install it again:
sudo pip uninstall cryptography
sudo pip uninstall paramiko
then install pagamiko again
sudo pip install paramiko
and it start to work for me
I recently had the same issue and none of the above solutions worked for me.
Here is what worked.
sudo apt remove python3-cffi
sudo python3 -m pip install cffi
Did you compile Python from source, and if so, did it give you any errors during the configure/make/make install phase? Compiling Python from source can be a real beast on older Red Hat systems, so if you installed that way, I'd suggest combing through the configure and make output to be sure that no modules were left out.
In order to get pip install cffi to succeed with no errors, I had to install gcc and libffi-devel from the EL5 repos. From there, I was able to instantiate an FFI instance with no problems:
>>> from cffi import FFI
>>> ffi = FFI()
>>>
Here's the output of pip freeze, for reference:
[root#machine ~]# pip freeze
argparse==1.2.1
autobahn==0.8.10
cffi==1.5.2
characteristic==14.3.0
pika==0.9.13
pyasn1==0.1.7
pyasn1-modules==0.0.8
pycparser==2.14
pycrypto==2.6.1
pyOpenSSL==0.12
pysnmp==4.2.5
requests==2.7.0
service-identity==14.0.0
six==1.7.3
Twisted==14.0.0
version-utils==0.2.2
wheel==0.24.0
zope.interface==4.1.1
If you've got the same or better versions of the relevant packages installed, I'd try a pip -vvv install --upgrade --force-reinstall cffi, just to see if there are perhaps errors that pip was masking, and go from there.
I had the same problem, following this thread https://github.com/pyca/cryptography/issues/4403, I solved the problem by reinstalling and upgrading with the command:
pip install -U cffi
You have to first remove the following packages:
cryptography
bcrypt
paramiko
Now use the following command to install:
pip -vvv install --upgrade --force-reinstall cffi
Have the same problem. After many attempts adding import cffi solve the issue.
Make sure you have cffi and cryptography installed.
You could look at the code L56 in /usr/lib/python2.6/site-packages/cffi/api.py
It needs the _cffi_backend.so in your pythonpath. You could install the python-cffi for it. But not sure whether it is in your RPM repo, especially you are using RHEL-5.
Here is an RPM for CENTOS http://cbs.centos.org/koji/rpminfo?rpmID=20613
Hope it helps. I am still searching the source code for building the _cffi_backend.so.
For me there was no way to install cffi on python3.8 because of this:
ImportError: cannot import name 'sysconfig' from 'distutils' (/usr/lib/python3.8/distutils/__init__.py)
Somehow, the package python3-distutils does not exist in Ubuntu 16.04.
So I ended up installing python3.7 and now I finally could install cffi, fixing the problem mentioned by the TS.
You should install cffi via pip install cffi
to get the latest version. I had to restart my application for it to recognize the cffi installation.
I was getting this error while trying to get the cryptography module to work with Python 3.8 for AWS Lambda.
Adding the cffi*manylinux*.whl files to my Lambda Layer (as suggested here) worked.
The cffi module comes built in for many python distributions, but not on AWS Lambda
For AWS Lambda I was facing the same issue when running on Python3.7. When I downgraded it to Python3.6, this issue was resolved.
I think this packaged might have been present in Python3.6 version and later was removed. Adding this package while making layers for AWS Lambda might resolve the problem for Python3.7.
I encountered this issue when trying to install packages in a local directory using pip install -t . and then running python (2.7). My solution was to remove the -t and not install into a local directory.
it worked after adding " import cffi " in my application.
please refer for more details.
https://buildmedia.readthedocs.org/media/pdf/cffi/latest/cffi.pdf
Thanks to #MPlanchard, for his answer which helped identify the cause
In my case, the issue was related to python3.9, changing to python3.8 it just works well!
After many futile efforts to install the right packages, the right python versions and building the perfect layer, resorting to installing Fabric solved it for me
I got this issue running an Ansible playbook using python 3.9 under Ubuntu-18.04 in WSL2. It was sorted by doing:
sudo apt-get remove -y python3-cffi-backend
sudo apt-get install -y python3-cffi-backend
I'm trying to install some packages with pip.
But pip install unroll gives me
Command "python setup.py egg_info" failed with error code 1 in
C:\Users\MARKAN~1\AppData\Local\Temp\pip-build-wa7uco0k\unroll\
How can I solve this?
About the error code
According to the Python documentation:
This module makes available standard errno system symbols. The value of each symbol is the corresponding integer value. The names and descriptions are borrowed from linux/include/errno.h, which should be pretty all-inclusive.
Error code 1 is defined in errno.h and means Operation not permitted.
About your error
Your setuptools do not appear to be installed. Just follow the Installation Instructions from the PyPI website.
If it's already installed, try
pip install --upgrade setuptools
If it's already up to date, check that the module ez_setup is not missing. If it is, then
pip install ez_setup
Then try again
pip install unroll
If it's still not working, maybe pip didn't install/upgrade setup_tools properly so you might want to try
easy_install -U setuptools
And again
pip install unroll
Here's a little guide explaining a little bit how I usually install new packages on Python + Windows. It seems you're using Windows paths, so this answer will stick to that particular SO:
I never use a system-wide Python installation. I only use virtualenvs, and usually I try to have the latest version of 2.x & 3.x.
My first attempt is always doing pip install package_i_want in some of my Visual Studio command prompts. What Visual Studio command prompt? Well, ideally the Visual Studio which matches the one which was used to build Python. For instance, let's say your Python installation says Python 2.7.11 (v2.7.11:6d1b6a68f775, Dec 5 2015, 20:40:30) [MSC v.1500 64 bit (AMD64)] on win32. The version of Visual Studio used to compile Python can be found here, so v1500 means I'd be using vs2008 x64 command prompt
If the previous step failed for some reason I just try using easy_install package_i_want
If the previous step failed for some reason I go to gohlke website and I check whether my package is available over there. If it's so, I'm lucky, I just download it into my virtualenv and then I just go to that location using a command prompt and I do pip install package_i_want.whl
If the previous step didn't succeed I'll just try to build the wheel myself and once it's generated I'll try to install it with pip install package_i_want.whl
Now, if we focus in your specific problem, where you're having a hard time installing the unroll package. It seems the fastest way to install it is doing something like this:
git clone https://github.com/Zulko/unroll
cd unroll && python setup.py bdist_wheel
Copy the generated unroll-0.1.0-py2-none-any.whl file from the created dist folder into your virtualenv.
pip install unroll-0.1.0-py2-none-any.whl
That way it will install without any problems. To check it really works, just login into the Python installation and try import unroll, it shouldn't complain.
One last note: This method works almost 99% of the time, and sometimes you'll find some pip packages which are specific to Unix or Mac OS X, in that case, when that happens I'm afraid the best way to get a Windows version is either posting some issues to the main developers or having some fun by yourself porting to Windows (typically a few hours if you're not lucky) :)
It was resolved after upgrading pip:
python -m pip install --upgrade pip
pip install "package-name"
I got stuck exactly with the same error with psycopg2. It looks like I skipped a few steps while installing Python and related packages.
sudo apt-get install python-dev libpq-dev
Go to your virtual env
pip install psycopg2
(In your case you need to replace psycopg2 with the package you have an issue with.)
It worked seamlessly.
I got this same error while installing mitmproxy using pip3. The below command fixed this:
pip3 install --upgrade setuptools
Download and install the Microsoft Visual C++ Compiler for Python 2.7 from https://www.microsoft.com/en-in/download/details.aspx?id=44266 - this package contains the compiler and set of system headers necessary for producing binary wheels for Python 2.7 packages.
Open a command prompt in elevated mode (run as administrator)
Firstly do pip install ez_setup
Then do pip install unroll (It will start installing numpy, music21, decorator, imageio, tqdm, moviepy, unroll) # Please be patient for music21 installation
Python 2.7.11 64 bit used
Other way:
sudo apt-get install python-psycopg2 python-mysqldb
I had the same issue when installing the "Twisted" library and solved it by running the following command on Ubuntu 16.04 (Xenial Xerus):
sudo apt-get install python-setuptools python-dev build-essential
It's a dependency issue.
I tried running the following commands helped me sorting out the dependencies, in my case the dependency was
grpcio
pip3 install --upgrade pip
python3 -m pip install --upgrade setuptools
pip3 install --no-cache-dir --force-reinstall -Iv grpcio==1.36.1
pip3 install pulsar-client==2.7.0
remember you must have python3 installed in your system.
First try:
pip install unroll
For sure not work :)
Then Try:
pip2 install unroll
Still get error Try:
pip3 install unroll
If pip3 Worked then suggest to change configuration to use pip3 as pip because you will get a lot of issues as the modern now is Python3 = pip3 if you execute a script files.
I had the same problem.
The problem was:
pyparsing 2.2 was already installed and my requirements.txt was trying to install pyparsing 2.0.1 which throw this error
Context: I was using virtualenv, and it seems the 2.2 came from my global OS Python site-packages, but even with --no-site-packages flag (now by default in last virtualenv) the 2.2 was still present. Surely because I installed Python from their website and it added Python libraries to my $PATH.
Maybe a pip install --ignore-installed would have worked.
Solution: as I needed to move forwards, I just removed the pyparsing==2.0.1 from my requirements.txt.
I ran into the same error code when trying to install a Python module with pip.
#Hackndo noted that the documentation indicate a security issue.
Based on that answer, my problem was solved by running the pip install command with sudo prefixed:
sudo pip install python-mpd2
For me this worked
python3 -m pip3 install -U pip
you can also try
python -m pip install -U pip
pip3 install --upgrade setuptools
WARNING: pip is being invoked by an old script wrapper. This will fail in a future version of pip.
Please see https://github.com/pypa/pip/issues/5599 for advice on fixing the underlying issue.
To avoid this problem you can invoke Python with -m pip instead of running pip directly.
Use python3 -m pip "command", eg:
python3 -m pip install --user pyqt5
I tried all of the above with no success. I then updated my Python version from 2.7.10 to 2.7.13, and it resolved the problems that I was experiencing.
That means some packages in pip are old or not correctly installed.
Try checking version and then upgrading pip.Use auto remove if that works.
If the pip command shows an error all the time for any command or it freezes, etc.
The best solution is to uninstall it or remove it completely.
Install a fresh pip and then update and upgrade your system.
I have given a solution to installing pip fresh here - python: can't open file get-pip.py error 2] no such file or directory
next installation helps me:
pip3 install cython
This worked for me:
sudo xcodebuild -license
Upgrading Python to version 3 fixed my problem. Nothing else did.
I downloaded the .whl file from http://www.lfd.uci.edu/~gohlke/pythonlibs/ and then did:
pip install scipy-0.19.1-cp27-cp27m-win32.whl
Note that the version you need to use (win32/win_amd-64) depends on the version of Python and not that of Windows.
I had this problem using virtualenvs (with pipenv) on my new development setup.
I could only solve it by upgrading the psycopg2 version from 2.6.2 to 2.7.3.
More information is at https://github.com/psycopg/psycopg2/issues/594
I faced the same problem with the same error message but on Ubuntu 16.04 LTS (Xenial Xerus) instead:
Command "python setup.py egg_info" failed with error code 1 in /tmp/pip-install-w71uo1rg/poster/
I tested all the solutions provided above and none of them worked for me. I read the full TraceBack and found out I had to create the virtual environment with Python version 2.7 instead (the default one uses Python 3.5 instead):
virtualenv --python=/usr/bin/python2.7 my_venv
Once I activated it, I run pip install unirest successfully.
try on linux:
sudo apt install python-pip python-bluez libbluetooth-dev libboost-python-dev libboost-thread-dev libglib2.0-dev bluez bluez-hcidump
Had the same problem on my Win10 PC with different packages and tried everything mentioned so far.
Finally solved it by disabling Comodo Auto-Containment.
Since nobody has mentioned it yet, I hope it helps someone.
I had the same problem and was able to fix by doing the following.
Windows Python needs Visual C++ libraries installed via the SDK to build code, such as via setuptools.extension.Extension or numpy.distutils.core.Extension. For example, building f2py modules in Windows with Python requires Visual C++ SDK as installed above. On Linux and Mac, the C++ libraries are installed with the compiler.
https://www.scivision.co/python-windows-visual-c++-14-required/
Following below command worked for me
[root#sandbox ~]# pip install google-api-python-client==1.6.4
Methods to solve setup.pu egg_info issue when updating setuptools or not other methods doesnot works.
If CONDA version of the library is available to install use conda instead of pip.
Clone the library repo and then try installation by pip install -e . or by python setup.py install
upgrading python's version did the work for me.
I have just encountered the same problem when trying to pip install -e . a new repo. I did not notice that the contents of setup.py haven't been saved properly and I was effectively running the command with an empty setup.py.
Hence you may experience the same error message if the setup.py of the target package is either empty or malformed.
I solved it on Centos 7 by using:
sudo yum install libcurl-devel
For some reason, I just can't get it to work. After running pip3 install twisted, here is the error that I'm presented with: https://bpaste.net/show/3b73706ea448 Along with error: command 'gcc failed with exit status 1, it also said Failed building wheel for twisted at some point. I've tried sudo yum install python3-devel and I also have gcc installed already. The same error occurs, whether I'm in a virtualenv or not.
Solved using the following:
sudo yum install redhat-rpm-config
as seen here: G++ error:/usr/lib/rpm/redhat/redhat-hardened-cc1: No such file or directory
You might need sudo for that installation.
Try something along the lines of:
sudo python3 -m pip install twisted
It's common for me at least that I need sudo for the correct installation of python packages (especially when compilation is involved)
(Unfortunately I can't comment to your post so I posted it as an answer)
I am working on a project for one of my lectures and I need to download the package psycopg2 in order to work with the postgresql database in use. Unfortunately, when I try to pip install psycopg2 the following error pops up:
ld: library not found for -lssl
clang: error: linker command failed with exit code 1 (use -v to see invocation)
error: command '/usr/bin/clang' failed with exit status 1
ld: library not found for -lssl
clang: error: linker command failed with exit code 1 (use -v to see invocation)
error: command '/usr/bin/clang' failed with exit status 1
Why is this happening?
I fixed this by installing Command Line Tools
xcode-select --install
then installing openssl via Homebrew and manually linking my homebrew-installed openssl to pip:
env LDFLAGS="-I/usr/local/opt/openssl/include -L/usr/local/opt/openssl/lib" pip install psycopg2
on macOS Sierra 10.12.1
Try installing it with:
pip install psycopg2-binary
brew install postgresql
If postgresql exist then run:
brew upgrade postgresql
sudo pip install psycopg2
In venv:
env LDFLAGS='-L/usr/local/lib -L/usr/local/opt/openssl/lib -L/usr/local/opt/readline/lib' pip install psycopg2==2.8.4
If you need use only the command pip install psycopg2 export the path in macOSX:
export LDFLAGS="-I/usr/local/opt/openssl/include -L/usr/local/opt/openssl/lib"
I fixed it with:
brew reinstall openssl
export LIBRARY_PATH=$LIBRARY_PATH:/usr/local/opt/openssl/lib/
Running into a similar problem using pipenv install psycopg2:
ld: library not found for -lssl', ' clang: error: linker command
failed with exit code 1 (use -v to see invocation)', " error:
command 'clang' failed with exit status 1", '
----------------------------------------',
I tried all of the recommendations above and none of them worked. I'd faced this problem in another virtualenv a few months ago and remembered reading something about this being a psycopg2 version issue. So I tried installing with 2.7.1 and 2.8.3 and both still failed. Somehow version 2.7.7 worked:
pipenv install psycopg2==2.7.7
Wish I had time to look into this further to understand what's really happening. But for now I don't and this worked.
For Mac OS 11.06 BigSur M1 ship, installing under a pyenv
brew reinstall libpq
brew reinstall openssl
Or install if its not already the case
brew info libpq
brew info openssl
Combine the 2 exported output logically, from
For compilers to find openssl#3 you may need to set:
export LDFLAGS="-L/opt/homebrew/opt/openssl#3/lib"
export CPPFLAGS="-I/opt/homebrew/opt/openssl#3/include"
...
export LDFLAGS="-L/opt/homebrew/opt/libpq/lib"
export CPPFLAGS="-I/opt/homebrew/opt/libpq/include"
into
export LDFLAGS="-L/opt/homebrew/opt/libpq/lib -L/opt/homebrew/opt/openssl#3/lib"
export CPPFLAGS="-I/opt/homebrew/opt/libpq/include -I/opt/homebrew/opt/openssl#3/include"
Then you can reinstall psycopg2, forcing the recompile, otherwise you will have this problem at runtime
pip uninstall psycopg2
pip install psycopg2 --no-cache-dir
Install/update Xcode developer tools
xcode-select --install
Query postgres path
find / -name pg_config 2>/dev/null
Install psycopg2, use the path you got in step 2. Mine was '/usr/local/Cellar/postgresql/9.5.0/bin/pg_config'
PATH=$PATH:/usr/local/Cellar/postgresql/9.5.0/bin/ pip install psycopg2
Well, tons of different options didn't work for me, but finally!
First, try this:
brew reinstall openssl
At the end of the reinstallation process you will get basically the following lines within Caveats section, which I've put in the zshrc config file since I use macOS Big Sur (version 11.1) and zsh terminal.
Open zshrc or other config file specific to your system:
nano ~/.zshrc
Paste the following lines at the end (or change these commands accordingly to the Caveats you've got), just keep in mind that OpenSSL provided by Homebrew might conflict with the system's one (I've got a warning that macOS provides LibreSSL) but it worked well anyway:
export PATH="/opt/homebrew/opt/openssl#1.1/bin:$PATH"
export LDFLAGS="-L/opt/homebrew/opt/openssl#1.1/lib"
export CPPFLAGS="-I/opt/homebrew/opt/openssl#1.1/include"
Save the file and exit by pressing ^X and confirming with Yes.
Hopefully you can now install psycopg2:
pip3 install psycopg2-binary
I'm still not sure what was the root cause of the problem, it just appeared suddenly when I tried to reinstall pipenv for my project (maybe some recent system updates).
It looks like the openssl package is not installed. Try installing it and pip install again. I'm not a macos user, but I believe that brew simplifies package management on that platform.
You might also need to install the Python development and postgresql development packages.
This works for me (on a terminal):
find / -name pg_config 2>/dev/null
then add the path:
export PATH=$PATH:/Applications/Postgres.app/Contents/Versions/9.5/bin/
os version: MacOs Sierra
I hope this helps.
Old, but for folks using pipenv, I resolved this issue by looking at my dependency graph pipenv graph --reverse and noticing it required psycopg2-binary==2.8.2. Running pipenv install psycopg2-binary resolved the issue.
env LDFLAGS="-I/usr/local/opt/openssl/include -L/usr/local/opt/openssl/lib" \
brew upgrade openssl
Then I could install psycopg2
try this -->pip install psycopg2-binary
In case you don't want to faff around with brew, here's the "MacOS-only solution":
sudo installer -pkg /Library/Developer/CommandLineTools/Packages/macOS_SDK_headers_for_macOS_10.14.pkg -target /
After this, pip will gladly install psycopg2 from the source. Works with "Mojave" (macOS 10.14).
The only thing that worked for me was:
pip install psycopg2==2.7.7
Try installing:
pip install psycopg2-binary
it works
I ran into the same error on macOS Big Sur (11.5.1) and Python 3.9.6.
It turned out, the psycopg2 (as well as pandas) versions I was using were too old. The error disappeared and pip install started working fine after upgrading the above packages.
Ref: https://github.com/Azure/azure-cli/issues/12854#issuecomment-619213863
In general, if the solutions suggested here by others don't help, try upgrading the troubling python package.
On my scenario, it was performed on:
ProductName: macOS
ProductVersion: 12.1
BuildVersion: 21C52
I proceed to install the following libraries by brewcommand:
brew install openssl libpq
Set specific variables:
export LDFLAGS="-L/opt/homebrew/opt/libpq/lib -L/opt/homebrew/opt/openssl#3/lib"
export CPPFLAGS="-I/opt/homebrew/opt/libpq/include -I/opt/homebrew/opt/openssl#3/include"
Proceed to install the python package psycopg2-binary via pip3:
pip3 install psycopg2-binary
If you are wondering why it is necessary to set those specific variables, take a look in the docs of the package via brew info command:
brew info openssl
brew info libpq
When the outcome is displayed, look for this sentence:
...
For compilers to find libpq you may need to set:
export LDFLAGS="-L/opt/homebrew/opt/libpq/lib"
export CPPFLAGS="-I/opt/homebrew/opt/libpq/include"
...
For compilers to find openssl#3 you may need to set:
export LDFLAGS="-L/opt/homebrew/opt/openssl#3/lib"
export CPPFLAGS="-I/opt/homebrew/opt/openssl#3/include"
...
Thats why, when pip is installing a package, needs a reference where to look for the libraries/compilers.
A perfect place to set this variables would be ~/.bashrc, for future installations regarding postgres and ssl:
export LDFLAGS="-L/opt/homebrew/opt/libpq/lib -L/opt/homebrew/opt/openssl#3/lib"
export CPPFLAGS="-I/opt/homebrew/opt/libpq/include -I/opt/homebrew/opt/openssl#3/include"
As per current/todey condition -
only solution for this is -
uninstall your python 3.8 or 3.9 or so on
and install ptyhon 3.7.4
I'm attempting to make a website with a few others for the first time, and have run into a weird error when trying to use Django/Python/VirtualEnv. I've found solutions to this problem for other operating systems, such as Ubuntu, but can't find any good solutions for Mac.
This is the relevant code being run:
virtualenv -p python3 venv
source venv/bin/activate
pip install -r requirements.txt
After running that block, I get the following errors:
AssertionError
Failed building wheel for django-toolbelt
Running setup.py bdist_wheel for psycopg2
...
AssertionError
Failed building wheel for psycopg2
Failed to build django-toolbelt psycopg2
I believe I've installed the "django-toolbelt" and "psycopg2", so I'm not sure why it would be failing.
The only difference I can think of is that I did not use the command
sudo apt-get install libpq-dev
as was instructed for Ubuntu usage as I believe that installing postgresql with brew took care of the header.
Thanks for any help or insight!
For MacOS users
After trying all the above methods (which did not work for me on MacOS 10.14), that one worked :
Install openssl with brew install openssl if you don't have it already.
add openssl path to LIBRARY_PATH :
export LIBRARY_PATH=$LIBRARY_PATH:/usr/local/opt/openssl/lib/
install psycopg2 with pip pip3 install psycopg2
I had the same problem on Arch linux. I think that it's not an OS dependant problem. Anyway, I fixed this by finding the outdated packages and updating then.
pip uninstall psycopg2
pip list --outdated
pip install --upgrade wheel
pip install --upgrade setuptools
pip install psycopg2
I was also getting same error.
Using Python 3.7.3 and pip 19.1.1.
I used following command.
pip install psycopg2-binary==2.8.3
TDLR
If you aren't used to installing Python C-extensions, and psycopg2 isn't a core part of your work, try
pip install psycopg2-binary
Building Locally
psycopg2 is a C-extension, so it requires compilation when being installed by pip. The Build Prerequisites section of the docs explain what must be done to make installation via pip possible. In summary (for psycopg 2.8.5):
a C compiler must be installed on the machine
the Python header files must be installed
the libpq header files must be installed
the pg_config program must be installed (it usually comes with the libpq headers) and on $PATH.
With these prerequisites satisfied, pip install psycopg2 ought to succeed.
Installing pre-compiled wheels
Alternatively, pip can install pre-compiled binaries so that compilation (and the associated setup) is not required. They can be installed like this:
pip install psycopg2-binary
The docs note that
The psycopg2-binary package is meant for beginners to start playing with Python and PostgreSQL without the need to meet the build requirements.
but I would suggest that psycopg2-binary is often good enough for local development work if you are not using psycopg2 directly, but just as a dependency.
Concluding advice
Read the informative installation documentation, not only to overcome installation issues but also to understand the impact of using the pre-compiled binaries in some scenarios.
I had same problem and this appears to be a Mojave Issue, I was able to resolve with:
sudo installer -pkg /Library/Developer/CommandLineTools/Packages/macOS_SDK_headers_for_macOS_10.14.pkg -target /
For Mac OS X users:
1. First check your postgresql path by running this command in terminal:
pg_config
If this fails lookup how to add pg_config to your path.
2. Next install Xcode Tools by running this command in terminal:
xcode-select --install
If you have both those sorted out now try to install psycopg2 again
For MacOS users, this question has the correct solution:
install command line tools if necessary:
xcode-select --install
then
env LDFLAGS="-I/usr/local/opt/openssl/include -L/usr/local/opt/openssl/lib" pip install psycopg2
I was also facing the same after running all the above commands, but the following two commands worked for me:
Instead of pip, use this:
sudo apt-get install libpq-dev
then run this command:
pip install psycopg2
On OS X, I was able to solve this by simply upgrading wheel before installing psycopg2:
pip install --upgrade wheel
For OSX Sierra users, it seems that an xcode update is the solution: Can't install psycopg2 package through pip install... Is this because of Sierra?
I tried all the above solutions but they did not work for me. What I did was change the psycopg2 version in my requirements.txt file from psycopg2==2.7.4 to psycopg2==2.7.6
Is your error message complete? the most encountered reason for failing to install psycopg2 on mac from pip is pg_config is not in path.
by the way, using macports or fink to install psycopg2 is more recommended way, so you don't have to worry about pg_config, libpq-dev and python-dev.
plus, are using Python 3.5? then upgrage your wheel to > 0.25.0 using pip.
I faced the same issue, but the answers above didn't work for me.
So this is what I did in my requirements.txt
psycopg2-binary==2.7.6.1 and it worked fine
I had this issue on several packages, including psycopg2, numpy, and pandas. I simply removed the version from the requirements.txt file, and it worked.
So instead of psycopg2-binary==2.7.6.1 I just had psycopg2-binary.
I know you are asking for development environment but if you are deploying on server say, Heroku. Just add below line in the requirements.txt of your project.
django-heroku==0.3.1
As this package itself will install the required packages like psycopg2 on server deployment.So let the server(heroku) should take care of it.
sudo apt install libpq-dev python3.X-dev
where X is the sub version,
these should be followed by :
pip install --upgrade wheel
pip install --upgrade setuptools
pip install psycopg2
Enjoy !!!
I solved my problem by updating/installing vs_BuildTools. The link to the software was given in the error itself.
Error Image
Fixed by installing python3.7-dev: sudo apt install python3.7-dev, based on the link.
Python: 3.7
Ubuntu: 20.04.3 LTS