Demonstrate inline png image

Notebook with PNG.ipynb

===================================== test session starts =====================================
platform linux -- Python 3.6.5, pytest-3.8.2, py-1.6.0, pluggy-0.7.1
rootdir: /home/stu/projects/mine/scratch/notebooks, inifile:
plugins: nbval-0.9.1
collected 1 item                                                                              

Notebook with PNG.ipynb F                                                               [100%]

========================================== FAILURES ===========================================
_______________________________ Notebook with PNG.ipynb::Cell 0 _______________________________
Notebook cell execution failed
Cell 0: Cell outputs differ

Input:
import io

from IPython.display import display
from PIL import Image


path="Raspi_Colour_R.png"
        
with open(path, 'rb') as f:
    inline_image = Image.open(io.BytesIO(f.read()))
    display(inline_image)

Traceback:
 mismatch 'text/plain'

 assert reference_output == test_output failed:

  '<PIL.PngImag...7FFB2C071EF0>' == '<PIL.PngImage...7FAE093AF860>'
  Skipping 61 identical leading characters in diff, use -v to show
  - 67 at 0x7FFB2C071EF0>
  + 67 at 0x7FAE093AF860>


====================================== warnings summary =======================================
/home/stu/.virtualenvs/scratch/local/lib/python3.6/site-packages/jupyter_client/manager.py:62: DeprecationWarning: KernelManager._kernel_spec_manager_changed is deprecated in traitlets 4.1: use @observe and @unobserve instead.
  def _kernel_spec_manager_changed(self):

-- Docs: https://docs.pytest.org/en/latest/warnings.html
============================ 1 failed, 1 warnings in 2.12 seconds ============================