let x, y, z

x, = (1,)

assert x == 1

y, = [2]

assert y == 2

for a, in [(1,),(2,),(3,)]:
    print(a)

try:
    z, = 1
except TypeError:
    print("okay")

print(list(x * x for x, in [(1,),[2],(3,)]))