Python3: ImportError: No module named '_ctypes' when using Value from module multiprocessing

Question

Installing libffi-dev and re-installing python3.7 fixed the problem for me.

to cleanly build py 3.7 libffi-dev is required or else later stuff will fail

If using RHEL/Fedora:

yum install libffi-devel

or

sudo dnf install libffi-devel

If using Debian/Ubuntu:

sudo apt-get install libffi-dev

On a fresh Debian image, cloning https://github.com/python/cpython and running:

sudo apt-get update
sudo apt-get upgrade
sudo apt-get dist-upgrade
sudo apt-get install build-essential python-dev python-setuptools python-pip python-smbus
sudo apt-get install libncursesw5-dev libgdbm-dev libc6-dev
sudo apt-get install zlib1g-dev libsqlite3-dev tk-dev
sudo apt-get install libssl-dev openssl
sudo apt-get install libffi-dev

Now execute the configure file cloned above:

./configure
make # alternatively `make -j 4` will utilize 4 threads
sudo make altinstall

Got 3.7 installed and working for me.

SLIGHT UPDATE

Looks like I said I would update this answer with some more explanation and two years later I don't have much to add.

• this SO post explains why certain libraries like python-dev might be necessary.
• this SO post explains why one might use the altinstall as opposed to install argument in the make command.

Aside from that I guess the choice would be to either read through the cpython codebase looking for #include directives that need to be met, but what I usually do is keep trying to install the package and just keep reading through the output installing the required packages until it succeeds.

Reminds me of the story of the Engineer, the Manager and the Programmer whose car rolls down a hill.

If you use pyenv and get error "No module named '_ctypes'" (like i am) on Debian/Raspbian/Ubuntu you need to run this commands:

sudo apt-get install libffi-dev
pyenv uninstall 3.7.6
pyenv install 3.7.6

Put your version of python instead of 3.7.6

Detailed steps to install Python 3.7 in CentOS or any redhat linux machine:

1. Download Python from https://www.python.org/ftp/python/3.7.0/Python-3.7.0.tar.xz
2. Extract the content in new folder
3. Open Terminal in the same directory
4. Run below code step by step :

sudo yum -y install gcc gcc-c++ 
sudo yum -y install zlib zlib-devel
sudo yum -y install libffi-devel 
./configure
make
make install

Thought I'd add the Centos installs:

sudo yum -y install gcc gcc-c++ 
sudo yum -y install zlib zlib-devel
sudo yum -y install libffi-devel 

Check python version:

python3 -V

Create virtualenv:

virtualenv -p python3 venv

This solved the same error for me on Debian:

sudo apt-get install libffi-dev

and compile again

Reference: issue31652

None of the solution worked. You have to recompile your python again; once all the required packages were completely installed.

Follow this:

1. Install required packages
2. Run ./configure --enable-optimizations

https://gist.github.com/jerblack/798718c1910ccdd4ede92481229043be