Develop Reference

How to install COCO PythonAPI in python3

It seems the COCO PythonAPI only support python2. But peoples do use it in python3 environment.
I tried possible methods to install it, like
python3 setup.py build_ext --inplace
python3 setup.py install
But python3 setup.py install will fail due to coco.py and cocoeval.py containning python2 print function.
Update: solved by updating the COCO PythonAPI project. Leave this question for people facing the same issue.

Try the following steps:
Use git clone to clone the folder into your drive. In this case, it should be git clone https://github.com/cocodataset/cocoapi.git
Use terminal to enter the directory, or open a terminal inside the directory
Type in 2to3 . -w. Note that you might have to install a package to get 2to3. It is an elegant tool to convert code from Python2 to Python3; this code converts all .py files from Python2-compatible to Python3-compatible
Use terminal to navigate to the setup folder
Type in python3 setup.py install
This should help you install COCO or any package intended for Python2, and run the package using Python3. Cheers!

I have completed it with a simple step
pip install "git+https://github.com/philferriere/cocoapi.git#egg=pycocotools&subdirectory=PythonAPI"
** before that you need to install Visual C++ 2015 build tools on your path

Install
Instead of the official version (which has issues with python 3) use an alternative one. Install it on your local machine, globally (i.e., outside any virtual environment). You can do this by:
pip install git+https://github.com/philferriere/cocoapi.git#subdirectory=PythonAPI
Check if it is installed globally:
pip freeze | grep "pycocotools"
You should see something like pycocotools==2.0.0 in your output.
Now, inside your virtual-env (conda or whatever), first install numpy and cython (and maybe setuptools if it's not installed) using pip, and then:
pip install pycocotools
Verify
Inside your project, import (for example) from pycocotools import mask as mask and then print(mask.__author__). This should print out the author's name, which is tsungyi.
Where Is It?
The installed package, like any other packages that are locally installed inside a virtual-env using pip, will go to External Libraries of your project, under site-packages. That means it is now part of your virtual-env and not part of your project. So, other users who may want to use your code, must repeat this installation on their virtual-env as well.
Troubleshooting:
The main source of confusion is that either you did not install the required packages before installing cocoapi, or you did install the required packages but for a different python version. And when you want to check if something is installed, you may check with, for instance, python3.6 and see that it exists, but you are actually running all your commands with python3.7. So suppose you are using python3.7. You need to make sure that:
python -V gives you python3.7 and NOT other version, and pip -V gives you pip 19.2.3 from /home/<USER>/.local/lib/python3.7/site-packages/pip (python3.7), that actually matches with your default python version. If this is not the case, you can change your default python using sudo update-alternatives --config python, and following the one-step instruction.
All the required packages are installed using the right python or pip version. You can check this using pip and pip3 to stop any differences that may cause an issue:
pip freeze | grep "<SUBSTRING-NAME-OF-PACKAGE>" or pip show <PACKAGE-NAME> for more recent versions of pip.
To install the required packages, after you made sure about (1), you need to run:
sudo apt install python-setuptools python3.7-dev python3-wheel build-essential and pip install numpy cython matplotlib
Environment:
The above steps were tested on Ubuntu 18.4, python 3.6.8, pip 19.0.3.

If you are struggling building pycocotools on Ubuntu 20.04 and python3.7
try this:
sudo apt-get install -y python3.7-dev
python3.7 -m pip install pycocotools>=2.0.1

There are alternative versions of the cocoapi that you can download and use too (I'm using python 3.5). Here's a solution that you might want to try out: How to download and use object detection datasets (e.g. coco or pascal)

here's how i did successfully! (the reason is the gcc version)
install the dependencies: cython (pip install cython), opencv (pip install opencv-python)
check the gcc version by this command: gcc --version
your output will be like this 'Command 'gcc' not found, but can be installed with:
sudo apt install gcc
'
Type the below commands to install the gcc:
sudo apt update
sudo apt install build-essential
sudo apt-get install manpages-dev
now check again the gcc version(step2)
if you get below output
'gcc (Ubuntu 9.3.0-17ubuntu1~20.04) 9.3.0
Copyright (C) 2019 Free Software Foundation, Inc.
This is free software; see the source for copying conditions. There is NO
warranty; not even for MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.'
now run the code for pycocotools installations:
pip install "git+https://github.com/philferriere/cocoapi.git#egg=pycocotools&subdirectory=PythonAPI"
finally wait check if the installation is successful :
'Successfully installed pycocotools-2.0'

Keep getting the "Command "python setup.py egg_info" failed with error code 1" [duplicate]

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

when installing pyaudio, pip cannot find portaudio.h in /usr/local/include

I'm using mac osx 10.10
As the PyAudio Homepage said, I install the PyAudio using
brew install portaudio
pip install pyaudio
the installation of portaudio seems successful, I can find headers and libs in /usr/local/include and /usr/local/lib
but when I try to install pyaudio, it gives me an error that
src/_portaudiomodule.c:29:10: fatal error: 'portaudio.h' file not found
#include "portaudio.h"
^
1 error generated.
error: command 'cc' failed with exit status 1
actually it is in /usr/local/include
why can't it find the file?
some answers to similar questions are not working for me(like using virtualenv, or compile it manually), and I want to find a simple way to solve this.

Since pyAudio has portAudio as a dependency, you first have to install portaudio.
brew install portaudio
Then try: pip install pyAudio. If the problem persists after installing portAudio, you can specify the directory path where the compiler will be able to find the source programs (e.g: portaudio.h). Since the headers should be in the /usr/local/include directory:
pip install --global-option='build_ext' --global-option='-I/usr/local/include' --global-option='-L/usr/local/lib' pyaudio

On Ubuntu builds:
sudo apt-get install python-pyaudio
For Python3:
sudo apt-get install python3-pyaudio

You have to install portaudio first then link that file. Only then you can find that header file (i.e, portaudio.h). To install portaudio in mac by using HomeBrew program use following commands.
brew install portaudio
brew link portaudio
pip install pyaudio
sudo is not needed if you're admin. We should refrain using sudo as it messes up lots of permissions.

First, you can use Homebrew to install portaudio.
brew install portaudio
Then try to find the portaudio path:
sudo find / -name "portaudio.h"
In my case it is at /usr/local/Cellar/portaudio/19.6.0/include .
Run the command below to install pyaudio
pip install --global-option='build_ext' --global-option='-I/usr/local/Cellar/portaudio/19.6.0/include' --global-option='-L/usr/local/Cellar/portaudio/19.6.0/lib' pyaudio

On Raspbian:
sudo apt-get install python-pyaudio

on Centos:
yum install -y portaudio portaudio-devel && pip install pyaudio

Just for the record for folks using MacPorts and not Homebrew:
$ [sudo] port install portaudio
$ pip install pyaudio --global-option="build_ext" --global-option="-I/opt/local/include" --global-option="-L/opt/local/lib"

I needed to do the following to install PortAudio on Debian
sudo apt install portaudio19-dev
I also apt install'd python3-portaudio before that, although it didn't work. I'm not sure if that contributed as well.

Adding a bit of robustness (in case of a non-default homebrew dir) to the snippet from #fukudama,
brew install portaudio
pip install --global-option='build_ext' --global-option="-I$(brew --prefix)/include" --global-option="-L$(brew --prefix)/lib" pyaudio

For me on 10.10.5 the paths were under /opt/local. I had to add /opt/local/bin to my /etc/paths file. And the command line that worked was
sudo pip install --global-option='build_ext' --global-option='-I/opt/local/include' --global-option='-L/opt/local/lib' pyaudio

this is the tested answer for MacBook Pro m2 chip:
first find the location of the portaudio.h file by
sudo find / -name "portaudio.h"
then, once you find the location, copy it and use it in this command.
LDFLAGS="-L/{opt/homebrew/Cellar/portaudio/19.7.0/}lib" CFLAGS="-I/{opt/homebrew/Cellar/portaudio/19.7.0}/include" pip3 install pyaudio
Here replace the location from { } into you file location hopefully this works. I have tried above solutions and this one worked for me.

If you are using anaconda/miniconda to manage your python environments then
conda install pyaudio
installs portaudio at the same time as pyaudio
The following NEW packages will be INSTALLED:
portaudio pkgs/main/osx-64::portaudio-19.6.0-h647c56a_4
pyaudio pkgs/main/osx-64::pyaudio-0.2.11-py37h1de35cc_2

On Termux (this is what worked for me):
pkg install python
bash -c "$(curl -fsSL https://its-pointless.github.io/setup-pointless-repo.sh)"
pkg install portaudio
pip install pyaudio
Source: pyaudio installing #6235

For M1 mac, this is worked for me:
LDFLAGS="-L/opt/homebrew/Cellar/portaudio/19.7.0/lib" CFLAGS="-I/opt/homebrew/Cellar/portaudio/19.7.0/include" pip3 install pyaudio
Res:
Created wheel for pyaudio: filename=PyAudio-0.2.12-cp310-cp310-macosx_11_0_arm64.whl size=24170 sha256=c74eb581e6bca2400f681f68d33654002722969f1a455ffce87e4e5da05471d8
Stored in directory: /private/var/folders/m_/kzyr4q_11cl35ngrj77k28f00000gn/T/pip-ephem-wheel-cache-ql1x8ums/wheels/93/08/0b/b915ab1895927641737175e5bc7b6111e8ed0c26daabeecba0
Successfully built pyaudio
Installing collected packages: pyaudio
Successfully installed pyaudio-0.2.12
Be noted, do not using find / its very slow and stupid, using brew info portaudio

I have already installed libpng, but there is an error " 'png.h' file not found #include <png.h>" when I am installing the autopy

I am a beginner at python, recently I want to install autopy in my Mac (Mavericks,10.9.4).
I read many introductions and other people's questions. But I still cannot install the autopy successfully. My steps to install the autopy are as below:
I have installed the libpng from the http://ethan.tira-thompson.com/Mac_OS_X_Ports.html
I am beginner, I check the /Library/Frameworks and /usr/local and I
think I have installed the libpng correctly
[Terminal]git clone git://github.com/msanders/autopy.git
According to the introduction, I write #include <OpenGL/gl.h> at the seventh line of the autopy file "src/screengrab.c"
[Terminal]cd autopy
[Terminal]python setup.py build
And here comes in the command window
src/png_io.c:3:10: fatal error: 'png.h' file not found
#include <png.h>
^
1 error generated.
error: command 'cc' failed with exit status 1
Do I need to rewrite the file address of "png.h" in the png_io.c?And what should I do to install the autopy on Mac?Do I have some important Omissions?

Try:
sudo apt-get install libpng-dev
I am installing autopy right now, and stuck at the same step. And after installing libpng-dev, the problem resolved. :)
The full process to install autopy is as follow
sudo apt-get install libx11-dev
to resolve "#include " not found error
sudo apt-get install libxtst-dev to resolve "#include " not found error
sudo apt-get install libpng-dev to resolve "#include " not found error
easy_install autopy

I have this problem every time I try to install autopy. As Evert mentioned in his comment on your question, your compiler can't find libpng. If you have properly installed it via the link you mentioned, then you can add some environment variables that will help your compiler find it, without having to edit the source code.
Here's a complete example that works for me on OS X Yosemite (10.10.1):
git clone git://github.com/msanders/autopy.git
cd autopy
export LIBRARY_PATH="/usr/local/lib:/usr/local/include/libpng"
export C_INCLUDE_PATH="/usr/local/lib:/usr/local/include/libpng"
python setup.py build
sudo python setup.py install

Try this it worked for me
sudo add-apt-repository ppa:linuxuprising/libpng12
sudo apt update
sudo apt install libpng12-0

After I confirmed that png.h was in a default path
/usr/local/include/png.h
I ran the following command to force these paths as default flags for the build
sudo CPPFLAGS='-I/usr/local/include/' LDFLAGS='-L/usr/local/lib/' python setup.py build
and it worked (on OS X Yosemite 10.10.5)
Remember to run the install version of the command, and to cd out of the autopy directory before attempting to use AutoPy

Error: No module named psycopg2.extensions

I am trying to set up a PostgreSQL database for my django project, which I believe I have done now thanks to the replies to my last question Problems setting up a postgreSQL database for a django project. I am now trying to run the command 'python manage.py runserver' in Terminal to get my localhost up but when I run the command, I see this response...
Error: No module named psycopg2.extensions
I'm not sure what this means - I have tried to download psycopg2 but can't seem to find a way to download psycopg2 using homebrew. I have tried easy_install, pip install and sudo but all return errors like this...
Downloading http://www.psycopg.org/psycopg/tarballs/PSYCOPG-2-4/psycopg2-2.4.5.tar.gz
Processing psycopg2-2.4.5.tar.gz
Writing /tmp/easy_install-l7Qi62/psycopg2-2.4.5/setup.cfg
Running psycopg2-2.4.5/setup.py -q bdist_egg --dist-dir /tmp/easy_install-l7Qi62/psycopg2-2.4.5/egg-dist-tmp-PBP5Ds
no previously-included directories found matching 'doc/src/_build'
unable to execute gcc-4.0: No such file or directory
error: Setup script exited with error: command 'gcc-4.0' failed with exit status 1
How to fix this?

The first thing to do is to install the dependencies.
sudo apt-get build-dep python-psycopg2
sudo apt install python3-psycopg2 # Python 3
After that go inside your virtualenv and use:
pip install psycopg2-binary
These two commands should solve the problem.

pip install psycopg2-binary
The psycopg2 wheel package will be renamed from release 2.8; in order to keep installing from binary please use "pip install psycopg2-binary" instead. For details see: http://initd.org/psycopg/docs/install.html#binary-install-from-pypi.

For Django 2 and python 3 install psycopg2 using pip3 :
pip3 install psycopg2

I installed it successfully using these commands:
sudo apt-get install libpq-dev python-dev
pip install psycopg2

For macOS Mojave just run pip install psycopg2-binary. Works fine for me, python version -> Python 3.7.2

first install apt-get install python-setuptools
then try easy_install psycopg2

This is what helped me on Ubuntu if your python installed from Ubuntu installer. I did this after unsuccessfully trying 'apt-get install' and 'pip install':
In terminal:
sudo synaptic
then in synaptic searchfield write
psycopg2
choose
python-psycopg2
mark it for installation using mouse right-click and push 'apply'. Of course, if you don't have installed synaptic, then first do:
sudo apt-get install synaptic

I ran into this same issues recently and this code worked.
sudo apt-get install libpq-dev python-dev-is-python3
Then
pip3 install psycopg2

In python 3.4, while in a virtual environment, make sure you have the build dependencies first:
sudo apt-get build-dep python3-psycopg2
Then install it:
pip install psycopg2

On Alpine Linux (majority of the docker containers) do:
apk add postgresql-dev
Then:
pip install psycopg2-binary

pip3 install django-psycopg2-extension
I know i am late and there's lot of answers up here which also solves the problem. But today i also faced this problem and none of this helps me. Then i found the above magical command which solves my problem :-P . so i am posting this as it might be case for you too.
Happy coding.

I used the extension after only importing psycopg2:
import psycopg2
...
psycopg2.extensions.AsIs(anap[i])

It seems that you need gcc-4.0, and it would be helpful to specify your OS type and version.
Maybe this question will help you a bit: Installing GCC to Mac OS X Leopard without installing Xcode
Update
I'm a Windows user, so I can't test your setup, but a quick google pointed to some more links:
http://hardlifeofapo.com/psycopg2-and-postgresql-9-1-on-snow-leopard/
Cannot install psycopg2 on OSX 10.6.7 with XCode4

I encountered the No module named psycopg2.extensions error when trying to run pip2 install psycopg2 on a Mac running Mavericks (10.9). I don't think my stack trace included a message about gcc, and it also included a hint:
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'.
I looked for the pg_config file in my Postgres install and added the folder containing it to my path: /Applications/Postgres.app/Contents/Versions/9.4/bin. Your path may be different, especially if you have a different version of Postgres installed - I would just poke around until you find the bin/ folder. After doing this, the installation worked.

try this: sudo pip install -i https://testpypi.python.org/pypi psycopg2==2.7b2
.. this is especially helpful if you're running into egg error
on aws ec2 instances if you run into gcc error; try this
1. sudo yum install gcc python-setuptools python-devel postgresql-devel
2. sudo su -
3. sudo pip install psycopg2

This one worked for me
python manage.py migrate

I had such problem when trying to run python script as a sudo, while psycopg2 was installed via pip3 to my own user's directory.
I managed to resolve the issue for myself removing pip3 version, and just installing it via apt:
pip3 uninstall psycopg2
sudo apt install python3-psycopg2

you can install gcc for macos from https://github.com/kennethreitz/osx-gcc-installer
after instalation of gcc you'll be able to install psycopg with easy_install or with pip

Check if you have installed psycopg2 if not
sudo apt-get install psycopg2
Install the dependencies.
sudo apt-get build-dep python-psycopg2
These two commands should solve the problem.

This error raise because you not install postgres database in you project virtutal environment. you should run one of these command.
from a terminal you can you command for sudo.
sudo apt-get install build-dep python-psycopg2
for pip (pip basically work for python)
pip install psycopg2
or
pip3 install psycopg2-binary
i'm pretty sure it will work for you.