python3常用庫(pypi)

1. cv2 (Unofficial pre-built OpenCV packages for Python.)
   pip install opencv-python
   pip install opencv-contrib-python
   import cv2

2. numpy (NumPy is the fundamental package for array computing with Python.)
   pip install numpy

3. Pillow (python2.x中爲PIL, Python Imaging Library (Fork))
   pip install Pillow
   from PIL import Image
   from PIL.Image import core as _imaging

4. matplotlib (Python plotting package)

   pip install matplotlib
   Successfully installed cycler-0.10.0 kiwisolver-1.1.0 matplotlib-3.0.3 pyparsing-2.4.0 python-dateutil-2.8.0 six-1.12.0