Change memory compare

[tmiklu]

Hi @mikeckennedy
A variables christmas and todaydate will never meet condition because they always have a different id in memory location.
You can use sys.intern() to intern strings for performance. This function allows you to compare their memory addresses rather than comparing the strings character-by-character

[mikeckennedy]

Thanks so much for pointing out this mistake. You're totally right, but Julian should have just used != or == for the test. I updated the code to work correctly.