MacOS High Sierra下conda环境Jupyter无法导入OpenEXR模块报错求助

Hey there, that Symbol not found error you're hitting is almost certainly a version mismatch between the Python OpenEXR bindings you installed and the underlying OpenEXR/IlmImf libraries in your conda environment. The error references Imf_2_2, which points to an older OpenEXR 2.2 series that your current environment doesn't have. Let's fix this step by step:

Step 1: Clean up existing conflicting packages #

First, we need to fully remove any existing OpenEXR-related packages to eliminate version conflicts:

# Activate your target conda environment first
conda activate your_env_name

# Uninstall the Python OpenEXR bindings (if installed via pip)
pip uninstall -y OpenEXR

# Uninstall conda-managed OpenEXR and its dependencies
conda uninstall -y openexr ilmbase

Step 2: Install compatible versions via conda-forge #

Conda-forge provides pre-built, compatible packages for MacOS that avoid these version mismatches. Use this channel to install the correct libraries:

# Add conda-forge channel (if you haven't already)
conda config --add channels conda-forge
conda config --set channel_priority strict

# Install openexr and its Python bindings
conda install -y openexr python-openexr

Step 3: Verify the fix #

1. First test the import directly in your terminal to confirm the libraries work:

python -c "import OpenEXR; print('OpenEXR version:', OpenEXR.__version__)"

If this prints a version number without errors, the library is properly installed.

2. Critical: Restart your Jupyter Notebook completely (don't just refresh the page). Jupyter caches environment state, so it won't pick up the new installation until you restart it. Then try importing OpenEXR in your notebook again:

import OpenEXR

Fallback: Manual compilation if conda install fails #

If the above steps don't work, you can compile the Python bindings to match your environment's OpenEXR version:

1. Install required build dependencies:

conda install -y ilmbase openexr cmake

2. Download the source code for Python OpenEXR that matches your installed openexr version (check with conda list openexr), then compile and install:

cd path/to/openexr-python-source
python setup.py build
python setup.py install

Quick Notes #

• Don't mix pip and conda for OpenEXR packages—this is the #1 cause of version mismatches here. Stick to one package manager for all OpenEXR-related installs.
• Double-check that your Jupyter Notebook is using the correct conda environment. Run !which python in a notebook cell to confirm the path matches your activated environment's Python executable.

内容的提问来源于stack exchange，提问作者Siddharth Das