Added version of apriori.py from pip modded for python 3: prints to print()s, commented out rulesFromConseq b/c of mixed tabs and spaces that make it seem broken, swapped map(set, dataSet) for list(map(set, dataSet))
Updated .gitignore
Cleaned up  some spacing for PEP 8 compliance, replaced map(frozenset, C1) with list comprehension for python 3, replaced dict of frozensets with defaultdict, replaced map(set, dataSet) with list comprehension, updates rulesFromConseq to work, moved sample code into a main().
Swapped defaultdict for Counter, b/c it's a better choice, PEP 8 formatting