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Struggling to get Vim to use Python 3.6 on Ubuntu 16.04? This guide walks you through the steps to compile Vim with Python 3.6 support for optimal performance with plugins like YouCompleteMe.
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How to Force VIM to Use Python 3.6 on Ubuntu 16.04

If you're a developer or power user on Ubuntu 16.04 and rely on VIM, you may encounter some compatibility issues with plugins like YouCompleteMe that require a specific version of Python—in this case, Python 3.6. Even if you have set Python 3.6 as your default interpreter using update-alternatives, you might find that VIM continues to use Python 3.5 instead. This can be frustrating, but the good news is that there is a solution.

In this guide, we'll explore how to compile VIM with Python 3.6 support to ensure that your development setup works seamlessly.

Understanding the Issue

VIM utilizes Python interpreters based on how it was compiled. Therefore, simply changing the default Python version does not affect VIM’s behavior. If you want VIM to recognize and use Python 3.6, you need to compile it from source with explicit support for Python 3.6.

Steps to Compile VIM with Python 3.6 Support

Step 1: Install Required Dependencies

Before compiling VIM, you'll need to install several dependencies. Open your terminal and run:

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vim-nox: This is a minimal version of VIM that includes support for various languages, including Python.

build-essential: This package contains the essential tools for compiling software.

python3.6-dev: This is the development package for Python 3.6, essential for building Python extensions.

Step 2: Download VIM Source Code

Next, you'll need to download the latest VIM source code. You can do this by cloning the official VIM repository, as follows:

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Step 3: Configure the Build

Now that you have the VIM source code, you need to configure it to use Python 3.6. This step is crucial and involves specifying the Python interpreter to use. Use the following command:

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In this command:

--enable-python3interp=yes tells the compiler to enable Python 3 interpreter support.

--with-python3-command=python3.6 specifies which Python command to use.

--with-python3-config-dir=$(python3.6-config --configdir) helps to find the configuration directory for Python 3.6.

Step 4: Compile and Install VIM

Once the configuration is complete, compile and install VIM with the following commands:

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This process may take some time, depending on the speed of your machine.

Step 5: Verify the Installation

Finally, to confirm that VIM is using Python 3.6, you can run:

[[See Video to Reveal this Text or Code Snippet]]

You should see " + python3/dyn" in the output, confirming Python 3 support.

Conclusion

Compiling VIM with Python 3.6 support on Ubuntu 16.04 might seem daunting, but by following these organized steps, you can quickly get it up and running. This approach not only resolves compatibility issues with plugins like YouCompleteMe but also enhances your overall development experience.

If you run into any issues or have additional questions, feel free to reach out! Happy coding!