Why the error occuring?

Question

states_needed = set([“mt”, “wa”, “or”, “id”, “nv”, “ut”, "ca", "az"])

stations = set ()
stations[“kone”] = set([“id”, “nv”, “ut”])
stations[“ktwo”] = set([“wa”, “id”, “mt”])
stations[“kthree”] = set([“or”, “nv”, “ca”])
stations[“kfour”] = set([“nv”, “ut”])
stations[“kfive”] = set([“ca”, “az”])

finel_station = {}

while states_needed:
states_covered = {}
best_station = None
for states, station in stations.items():
covered = states_needed & states
if len(covered)>len(states_needed):
best_station = station
states_covered = covered

states_needed -= states_covered
final_station.add(best_station)

OUTPUT :-
File "main.py", line 1

states_needed = set([“mt”, “wa”, “or”, “id”, “nv”, “ut”, "ca", "az"])

^

SyntaxError: invalid character in identifier

Answer 1

You need to use single(' ') or double(" ") quotes to denote a string (not “ ”)

Answer 2

my interpreter says what Simba says, use "" or '' only !

Answer 3

Okay I got it...