mystery.py

#!/usr/bin/python3 -i

# Hello there!
# The following line of code creates a mystery object which behaves in really weird ways.
# Have fun trying to figure it out.
#   :Dom
#
# PS: This concept came from a Kiwi Pycon 2015 talk.

mystery = next(filter(lambda _:'.'in repr([_])and not(list!= type(_) or _),['%s'%{}]+__import__('gc').get_objects()))

print()
print("Try these in your interactive python3 shell:")
print()
print("mystery")
print("{'mystery': mystery}")
print("[[mystery]]")
print()