12:17 is proving confusing syntax wise


#1

https://www.codecademy.com/en/courses/python-beginner-nzzVa/4/1?curriculum_id=4f89dab3d788890003000096
So I'm trying to concatenate two lists in a function. I'm defining the function with two arguments, as instructed, and returning them added together. I can't see anything wrong with the syntax but it refuses to pass it, saying 'SyntaxError: invalid syntax', with the ^ pointing to the 's(' on the function defining line.

m = [1, 2, 3]
n = [4, 5, 6]

# Add your code here!
dev join_lists(x, y):
    return x + y
    
print join_lists(m, n)
# You want this to print [1, 2, 3, 4, 5, 6]


#2

function definition is wrong, its def not dev


#3

Oh yes. Thank you for pointing that out.