Calling a C program from a Python program
Calling a C program from a Python program can be useful when you need to leverage the performance of a C library or when you want to interface with existing C code. In this tutorial, I'll walk you through the steps to achieve this with code examples. We'll use the ctypes library, which is included with Python, to call C functions from a Python program.
First, let's create a simple C program. This program will contain a function that adds two integers. Create a file named add.c with the following content:
Compile the C program using your C compiler. Open a terminal and run the following command to compile add.c:
This command generates a shared library named add.so from add.c.
Now, let's create a Python program to call the C function add from the shared library. Create a Python file named call_c_from_python.py with the following content:
Execute the Python program by running the following command in your terminal:
You should see the output:
This demonstrates that you've successfully called a C function from your Python program.
In the Python program, we used the ctypes library to load the shared library (add.so) and define the argument types and return type of the C function we want to call. We then called the C function just like any other Python function.
Remember to adapt this example to your specific use case and make sure the shared library (.so or .dll) is available in the correct location.
Calling C code from Python using ctypes is a powerful way to leverage existing C libraries or optimize specific parts of your Python code that require low-level performance.
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