we are glad to help but we are not going to do it for you. Post your code in python tags, any error traceback - in error tags and in full. Also post the assignment verbatim (your current example is contradicting - how passing [1, 1, 1, 1] to function will return True (i.e. items in list appear only one time) when the item 1 appears 4 times)... why [1, 1, 2, 2] will return True and [1, 1, 2, 3] will return False?
If you can't explain it to a six year old, you don't understand it yourself, Albert Einstein
How to Ask Questions The Smart Way: link and another link
Create MCV example
Debug small programs
How to Ask Questions The Smart Way: link and another link
Create MCV example
Debug small programs