Install OpenCV 3.4 in Python 3.6 / 2.7

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OpenCV 3 works with Python 2.7, 3.4, 3.5 and 3.6. The unofficial OpenCV PyPi wheels work for Linux, Mac and Windows.

python -m pip install opencv-python

OpenCV including the Extra contributed modules may be done instead by:

python -m pip install opencv-contrib-python


  • OpenCV 3 release notes
  • Conda-forge OpenCV 3
  • (reference) Windows-only OpenCV wheels. (cpMN where you have Python M.N). contrib includes OpenCV-extra packages. For example, assuming you have Python 3.6, you might download opencv_python-3.4.0+contrib-cp36-cp36m-win_amd64.whl.

Python executable selection

If you get the ... is not supported on this platform error be sure you’re not accidentally using Python 2.7 instead of Python 3, you may have to manually specify the path for the pip command e.g.

c:\anaconda3\scripts\python -m pip install opencv-python

Test Python OpenCV install

We made several test scripts to try out the OpenCV install.

compile source

You can compile and install OpenCV for Python 2.7 to Python 3.6. Or compile OpenCV with extra contributed packages. Compiling yourself allows customizing and optimizing OpenCV for your computer (e.g. using GPU, TBB, OpenCL, etc.).


The conda install opencv and conda install -c conda-forge opencv methods for OpenCV continue to be BROKEN for video/image reading and display. Use pip install above instead.

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