Pythonnet: Importing Python Script into C#

What will you learn?

In this comprehensive tutorial, you will master the art of seamlessly importing a Python script into a C# application using Pythonnet. By the end of this guide, you will be equipped with the skills to integrate Python functionalities within your C# codebase effortlessly.

Introduction to the Problem and Solution

When working on projects that involve a mix of Python and C#, merging these two languages can significantly enhance your project’s capabilities. The integration of Python scripts into a C# application is made possible through Pythonnet. This powerful package facilitates interoperability between Python and .NET languages like C#.

By importing Python scripts into your C# project, you can tap into the expansive library ecosystem of Python while benefiting from the performance and type safety features offered by C#. This approach not only enhances code reusability but also fosters flexibility across different language environments, empowering developers to create robust applications.


import clr
clr.AddReference("Python.Script.dll")  # Add reference to your Python script DLL

from YourNamespace import YourClass  # Import necessary class or module from the DLL

if __name__ == "__main__":
    # Your code here

# Copyright PHD

Note: Before importing your Python script into your C# project, ensure it is compiled into a .NET assembly (DLL). For detailed guidance on compiling Python scripts as DLLs, refer to resources such as


  • clr: The clr module provided by Pythonnet enables interaction with .NET assemblies.
  • AddReference(): This function adds a reference to the specified .NET assembly (in this case, our compiled Python script).
  • from … import …: Used to import specific classes or modules from the imported assembly for usage in our program.
  • The conditional block if __name__ == “__main__”: ensures specific code executes only when the script is run directly.
  1. How do I compile my Python script into a .NET assembly?

  2. To compile your Python script into a .NET assembly, tools like py2exe, pyinstaller, or .Net Compiler Platform can be used.

  3. Can I call functions defined in my imported python script from my C# application?

  4. Yes, after importing required classes/modules from your python script using Pythonnet, their functions can be called like any other.NET object.

  5. Do I need both Anaconda and Visual Studio installed for this integration?

  6. No, only Visual Studio is needed for developing your C# application; Anaconda is not specifically required for integrating these two languages.

  7. Is there any performance overhead when calling python scripts from c# via Pythonnet?

  8. While there might be some overhead due to inter-language communication, it’s generally acceptable unless handling extremely time-sensitive operations.

  9. Can I pass data back and forth between my c# application and imported python scripts?

  10. Data exchange between both sides is feasible through methods like method calls or file input/output operations.

  11. Are there limitations on what type of python scripts can be imported?

  12. Most standard python scripts should be importable; however, complex dependencies or platform-specific libraries may pose issues during compilation or execution.


Integrating existing functionality written in one language (such as Python) into another (like C#) unlocks opportunities for leveraging strengths across different ecosystems. With tools like Pythonnet, bridging gaps between languages becomes more manageable, fostering enhanced productivity and efficiency in software development projects.

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