Check if string is uppercase or lowercase and eliminate

[Mekire]

isupper is a function not an attribute so it needs parenthesis

>>> "Fred".isupper
<built-in method isupper of str object at 0x0348DEC0>
>>> "Fred".isupper()
False
>>> "Fred"[0].isupper()
True

Also you should be using for loops for this, not while loops:

code = "soMe SuPPLies liKE Ice-cREAm aRe iMPORtant oNly tO THeir cReaTORS. tO DestroY thEm iS pOInTLess"

for word in code.split():
    if word[0].isupper():
        print(word)