Woah, I loved how expository your code was. I am also a python programmer but am not too familiar with this module. Thanks for the tutorial. A question though. Why is the dump function there when a suitable alternative would be to commit the dictionary to a file simply using such code for example

       x = open(filename, 'w+')
        x. write(fav_cryptos)
        x. close 

Wouldn't this append the file to the document or is it for a more peculiar purpose?