str converts the list into its string representation. Use map to convert each number in the list to str:
lista = [1,2,3,4,9,5]
print("<".join(map(str, sorted(lista))))
>>> 1<2<3<4<5<9
0
solved Can´t join a list the way I would like
 
str converts the list into its string representation. Use map to convert each number in the list to str:
lista = [1,2,3,4,9,5]
print("<".join(map(str, sorted(lista))))
>>> 1<2<3<4<5<9
0
solved Can´t join a list the way I would like