Modulenotfounderror: no module named _ctypes [Fixed]

Do you get the Modulenotfounderror: no module named ‘_ctypes?

Then you’ve come to the right place.

So, in this tutorial, we will provide a brief discussion of this error as well as step-by-step solutions to resolve it.

What is module ‘_Ctypes’?

Particularly, the ‘_ctypes’ module is a Python module that provides a foreign function interface (FFI) for calling functions in shared libraries or DLLs.

It allows Python code to interact with C code and provides a way to create C-compatible data types in Python.

Additionally, this ‘_ctypes‘ module is a standard library module in Python and is available in all versions of Python.

It is widely used in system programming, network programming, and other areas where C libraries are used.

Why is Module ‘_ctypes’ used?

Technically, the ‘_ctypes‘ module is used in Python to interact with C code and C libraries.

It provides a way to call functions in shared libraries or DLLs and create C-compatible data types in Python.

There are several reasons why one might want to use the ‘_ctypes‘ module:

  • Interfacing with C code: If you need to call a C function from Python or use a C library in Python, the ‘_ctypes’ module provides a way to do this.
  • Accessing system functionality: Many system functions are only available in C libraries, and the ‘_ctypes’ module allows you to access these functions from Python.
  • High-performance computing: C is often used for high-performance computing, and the ‘_ctypes’ module can be used to call C functions from Python to take advantage of their performance.
  • Network programming: Many network protocols are implemented in C libraries, and the ‘_ctypes’ module can be used to call these libraries from Python.

What is Modulenotfounderror: no module named _ctypes?

Modulenotfounderror: no module named _ctypes error occurs due to incompatibility between Python 3.7.0 and ‘ctypes’ in the absence of the libffi-dev package.

So if we do not explicitly install the libffi-dev package, Python 3.7.0 installation will raise the Modulenotfound error.

As the root cause is pretty simple in the same way the solution too.

All we have to do is install or reinstall the libffi-dev package.

Let’s get started.

How to fix Modulenotfounderror: no module named ‘_ctypes’

Now that we were already done exploring what Modulenotfounderror: no module named ‘_ctypes and possible causes of why this error occurs.
So now we will walk through solutions along with Linux, CentOs, and MacOS systems.

  1. Fix the error by checking the module name.

    The first step to fix this error is to check the spelling of the module name, wherein this module name is case-sensitive.

    For instance, importing this module is typed like this:

    import _Ctypes

    This will throw the error:

    ModuleNotFoundError: No module named ‘_Ctypes’

    This is because the “C” should be lowercase since it is case-sensitive.

  2. Fix the error in Linux

    The main reason why Ubuntu Linux system raises the Modulenotfounderror: no module named ‘_ctypes’ error is that it requires to install libffi-dev package first.

    Wherein the _cytpes is depending on libffi-dev package.

    So when the libffi-dev is missing in the installation, _ctypes can not be used.

    To fix this we need to install libffi-dev with use of the following command:

    sudo apt install libffi-dev or sudo apt-get install libffi-dev

  3. Solve the error in CentOS

    To use the _ctypes modules in CentOS in Linux, we need to install a new package: libffi -devel.

    In Centos, we must use the “yum” command to install the libffi -devel package.

    Moreover, the yum command is the standard package manager.

    Thus, CentOS, we use this command to install and update packages.

    The code for installing the package is:

    yum install libffi-devel -y
    make install

  4. Fix the error in MacOS

    Use this code in your macOS terminal to install libffi.

    Here, we are installing libffi version 3.2.1. You can change your version accordingly.

    tar xvfz libffi-3.2.1.tar.gz
    cd libffi-3.2.1
    ./configure –prefix=/usr/local/libffi/3_2_1
    make install

Additional Solutions to Fix no module named ‘_ctypes’

If the error still raises even if you perform the ways above it may be because of missing dependencies. Try the following codes to install the dependencies.

  1. sudo apt-get update
  2. sudo apt-get upgrade
  3. sudo apt-get dist-upgrade
  4. sudo apt-get install build-essential python-dev python-setuptools python-pip python-smbus
  5. sudo apt-get install libncursesw5-dev libgdbm-dev libc6-dev
  6. sudo apt-get install zlib1g-dev libsqlite3-dev tk-dev
  7. sudo apt-get install libssl-dev openssl
  8. sudo apt-get install libffi-dev


In conclusion Modulenotfounderror: no module named ctypes is an error raised when the libffi-dev package is missing in installation.

Remember to always keep your Python installation and modules up to date, and to check for missing dependencies if you encounter any issues.

That’s it we have provided solutions for fixing this error. However, if you follow the steps and encounter any further errors, feel free to ask for more help!

If you are finding solutions to some errors you’re encountering we also have Modulenotfounderror: no module named ‘debug_toolbar’.

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