please solve and provide code in python

this is my code but apparently its wrong

Question

Goal: Learn to combine different list methods.

Assignment: Given the lists list$\_1$ and list$\_2,$ create a new sorted list consisting of all the elements of $1$ist$\_1$ that do not appear in list$\_2.$ Make sure that duplicate items only appear once. Assign this new list to diff$\_$list. Make sure to use the sort function.

$```$

def find$\_$difference$($list$\_1,$ list$\_2)$:

diff$\_$list $=[]$

for item in list$\_1$:

if item not in list$\_2$ and item not in diff$\_$list:

diff$\_$list.append$($item$)$

diff$\_$list.sort$()$

return diff$\_$list

$```$

Feedback $-$ Execution

More information

No output.

Feedback:

$\backslash (\backslash$varnothing $\backslash )$ Expected variable 'diff$\_$list' to exist