Buggy python submission (verdict: Runtime Error):
import sys
from scipy.sparse.csgraph import shortest_path
from scipy.sparse import csr_matrix
from itertools import permutations
read = sys.stdin.read
readline = sys.stdin.readline

N, M, R = map(int, readline().split())
r = list(map(int, readline().split()))
ABC = map(int, read().split())
A, B, C = map(list, zip(*zip(ABC, ABC, ABC)))

for i in range(N + 1):
    A.append(i)
    B.append(i)
    C.append(0)

csr = csr_matrix((C, (A, B)), (N + 1, N + 1))
distance = shortest_path(csr, directed=False)

answer = 10 ** 9
for tour in permutations(r):
    tmp = 0
    for i, j in zip(tour, tour[1:]):
        tmp += distance[i][j]

    if tmp < answer:
        answer = tmp

print(int(answer))

Fixed submission:
import sys
from scipy.sparse.csgraph import floyd_warshall
from itertools import permutations
read = sys.stdin.read
readline = sys.stdin.readline

N, M, R = map(int, readline().split())
r = list(map(int, readline().split()))

INF = float('inf')
graph = [[INF] * (N + 1) for _ in range(N + 1)]
ABC = map(int, read().split())

for i in range(N + 1):
    graph[i][i] = 0

for A, B, C in zip(*[iter(ABC)] * 3):
    graph[A][B] = C
    graph[B][A] = C

distance = floyd_warshall(graph, directed=False)
answer = 10 ** 9
for tour in permutations(r):
    tmp = 0
    for i in range(R - 1):
        tmp += distance[tour[i]][tour[i + 1]]

    if tmp < answer:
        answer = tmp

print(int(answer))

Buggy python submission (verdict: Runtime Error):
import sys
from scipy.sparse.csgraph import shortest_path
from scipy.sparse import csr_matrix
from itertools import permutations
read = sys.stdin.read
readline = sys.stdin.readline

N, M, R = map(int, readline().split())
r = list(map(int, readline().split()))
ABC = map(int, read().split())
A, B, C = map(list, zip(*zip(ABC, ABC, ABC)))
A.append(0)
B.append(0)
C.append(0)

csr = csr_matrix((C, (A, B)), (N + 1, N + 1))
distance = shortest_path(csr, directed=False)

answer = 10 ** 9
for tour in permutations(r):
    tmp = 0
    for i, j in zip(tour, tour[1:]):
        tmp += distance[i][j]

    if tmp < answer:
        answer = tmp

print(int(answer))

Fixed submission:
import sys
from scipy.sparse.csgraph import floyd_warshall
from itertools import permutations
read = sys.stdin.read
readline = sys.stdin.readline

N, M, R = map(int, readline().split())
r = list(map(int, readline().split()))

INF = float('inf')
graph = [[INF] * (N + 1) for _ in range(N + 1)]
ABC = map(int, read().split())

for i in range(N + 1):
    graph[i][i] = 0

for A, B, C in zip(*[iter(ABC)] * 3):
    graph[A][B] = C
    graph[B][A] = C

distance = floyd_warshall(graph, directed=False)
answer = 10 ** 9
for tour in permutations(r):
    tmp = 0
    for i in range(R - 1):
        tmp += distance[tour[i]][tour[i + 1]]

    if tmp < answer:
        answer = tmp

print(int(answer))

Buggy python submission (verdict: Runtime Error):
import sys
from scipy.sparse.csgraph import shortest_path
from scipy.sparse import coo_matrix
from itertools import permutations
read = sys.stdin.read
readline = sys.stdin.readline

N, M, R = map(int, readline().split())
r = list(map(int, readline().split()))
ABC = map(int, read().split())

INF = float('inf')

ABC = zip(ABC, ABC, ABC)
A, B, C = zip(*ABC)

csr = coo_matrix((C, (A, B)), (N + 1, N + 1))
distance = shortest_path(csr, directed=False)

answer = 10 ** 9
for tour in permutations(r):
    tmp = 0
    for i, j in zip(tour, tour[1:]):
        tmp += distance[i][j]

    if tmp < answer:
        answer = tmp

print(int(answer))

Fixed submission:
import sys
from scipy.sparse.csgraph import floyd_warshall
from itertools import permutations
read = sys.stdin.read
readline = sys.stdin.readline

N, M, R = map(int, readline().split())
r = list(map(int, readline().split()))

INF = float('inf')
graph = [[INF] * (N + 1) for _ in range(N + 1)]
ABC = map(int, read().split())

for i in range(N + 1):
    graph[i][i] = 0

for A, B, C in zip(*[iter(ABC)] * 3):
    graph[A][B] = C
    graph[B][A] = C

distance = floyd_warshall(graph, directed=False)
answer = 10 ** 9
for tour in permutations(r):
    tmp = 0
    for i in range(R - 1):
        tmp += distance[tour[i]][tour[i + 1]]

    if tmp < answer:
        answer = tmp

print(int(answer))