Ubuntu18.04下Python3.6安装mlpy0.1.0报Py_InitModule3未声明错误

Hey there, let's work through this mlpy installation issue you're facing!

Why You're Seeing This Error #

That ‘Py_InitModule3’ was not declared in this scope message is a clear red flag: mlpy 0.1.0 was built exclusively for Python 2.x, and it's completely incompatible with Python 3.x. Py_InitModule3 is a C API function that Python 3 removed entirely, so when your Python 3.6 tries to compile the package's C extensions, it can't find that function at all.

Solutions to Try #

Option 1: Use Python 2.7 (Easiest Fix)

Ubuntu 18.04 comes with Python 2.7 pre-installed, so this is the quickest way to get mlpy up and running:

1. First, make sure you have pip for Python 2 installed:

   sudo apt-get update && sudo apt-get install python-pip
   

2. Install mlpy using pip2:

   pip2 install mlpy==0.1.0
   

3. If you're installing from source, run setup.py with Python 2 instead:

   python2 setup.py install
   

Option 2: Adapt the Code for Python 3 (Advanced)

If you absolutely need to use mlpy with Python 3.6, you'll have to modify the package's source code to update the C extensions for Python 3:

• Locate the C files in the mlpy/libs directory where the error occurs
• Replace Py_InitModule3 with Python 3's equivalent PyModule_Create function
• Fix other Python 2 → Python 3 API differences (like string handling and type conversions)
• After making these changes, re-run the installation:

  python3 setup.py install
  

Note: This requires familiarity with Python's C extension API, so it's only recommended if you're comfortable with low-level Python development.

内容的提问来源于stack exchange，提问作者Shiv Pratap Singh