I imported cv2 but it is showing; No module named ‘cv2’
Unable to import cv2
Hey @stutijain578, did you install opencv library ? If no , then please install it using the following command in the anaconda prompt :
conda install -c conda-forge opencv
Hope this helps !
Happy coding 
does the same command hold for mac as well?
Yes yes just write this in terminal.
how to put one image on another?
I would be happy to help. Can you please ask this as a separate query on the portal ? I hope your error of : No module named cv2 has been resolved ! 
Happy Learning 
yes
and this also got resolved 