The following code is supposed to print MyWords after removing SpamWords[0]. However; instead of returning "yes" it instead returns "None". Why is it returning "None"?
MyWords = "Spam yes"
SpamWords = ["SPAM"]
SpamCheckRange = 0
print ((MyWords.upper()).split()).remove(SpamWords[SpamCheckRange])
Because remove is a method that changes the mutable list object it's called on, and returns None.
l= MyWords.upper().split()
l.remove(SpamWords[SpamCheckRange])
# l is ['YES']
Perhaps you want:
>>> [word for word in MyWords.split() if word.upper() not in SpamWords]
['yes']
l is ['YES'].remove is a method of list (str.split returns a list), not str. It mutates the original list (removing what you pass) and returns None, not a modified list.