Anaconda Python报错ModuleNotFoundError: No module named 'matlab'，求助解决

Hey there! Let’s walk through this installation issue step by step—since you’re using an Anaconda environment with Python 3.6 and MATLAB R2018a, there are a few specific checks and fixes to try:

1. Ensure You’re in the Correct Anaconda Environment #

A super common mistake is using the system Python instead of your Conda environment’s Python. Let’s fix that first:

• Activate your target environment (replace your_env_name with your actual environment name, e.g., base):

  conda activate your_env_name
  

• Verify you’re using the right Python executable:

  # Linux/macOS
  which python
  
  # Windows
  where python
  

  The output should point to a path inside your Anaconda envs folder, not the system’s default Python location.

2. Navigate to the MATLAB Engine Setup Directory #

MATLAB R2018a stores the Python engine files in a specific folder. CD into this path first (adjust for your OS):

• Linux: /usr/local/MATLAB/R2018a/extern/engines/python
• Windows: C:\Program Files\MATLAB\R2018a\extern\engines\python
• macOS: /Applications/MATLAB_R2018a.app/Contents/MATLAB/extern/engines/python

Run this command to move into the directory:

cd /usr/local/MATLAB/R2018a/extern/engines/python

3. Install Using Your Conda Environment’s Python #

Instead of relying on the generic python alias, use the full path to your Conda env’s Python to run the setup script. This avoids mixing system and Conda Python versions:

# Linux/macOS example
/path/to/your/anaconda/env/bin/python setup.py install

# Windows example
C:\path\to\your\anaconda\env\python.exe setup.py install

If you hit permission errors on Linux/macOS, don’t use sudo directly (it will default to system Python). Instead, fix ownership of the MATLAB directory first:

sudo chown -R $USER /usr/local/MATLAB/R2018a

Then re-run the install command without sudo.

4. Confirm 64-Bit Compatibility #

MATLAB R2018a is 64-bit only, so your Python installation must also be 64-bit. Check this with:

import platform
print(platform.architecture())

You should see ('64bit', ...) in the output. If you have 32-bit Python, reinstall Anaconda with the 64-bit version.

5. Fix Spyder’s Interpreter Configuration #

If the install succeeds but Spyder can’t find matlab.engine, it’s probably using the wrong Python interpreter:

1. Open Spyder, go to Tools > Preferences > Python interpreter.
2. Select "Use the following interpreter" and browse to the Python executable in your Conda environment.
3. Restart Spyder and try importing the module again.

6. Add MATLAB Libraries to Your System Path #

If you get errors about missing MATLAB libraries, add MATLAB’s binary directory to your system’s library path:

• Linux: Add this line to ~/.bashrc or ~/.zshrc:

  export LD_LIBRARY_PATH=/usr/local/MATLAB/R2018a/bin/glnxa64:$LD_LIBRARY_PATH
  

  Run source ~/.bashrc (or source ~/.zshrc) to apply changes.
• macOS: Add this to ~/.zshrc or ~/.bash_profile:

  export DYLD_LIBRARY_PATH=/Applications/MATLAB_R2018a.app/Contents/MacOS/bin/maci64:$DYLD_LIBRARY_PATH
  

• Windows: Add C:\Program Files\MATLAB\R2018a\bin\win64 to your system’s PATH environment variable, then restart your computer.

7. Test the Installation #

Once everything is set up, test the engine in Spyder:

import matlab.engine
eng = matlab.engine.start_matlab()
result = eng.sqrt(4.0)
print(result)
eng.quit()

If this runs without errors, you’re good to go!

内容的提问来源于stack exchange，提问作者Dennis