当我使用多个“if”循环时，为什么它总是说“Syntax error”？

Question

我尝试用python编写一个“让你自己冒险”的故事，并且尝试使用多个“if”循环。然而，程序一直在说“语法错误”。有人能告诉我为什么会发生这种情况，并说明一个可能的解决方案吗

a = eval(input("Enter 0 to go on the ladder, and 1 to try out you new pair of plunger boots: "))
if a == 1:
    print("You put on the boots and climb on the side of the ship. You put one foot forward, then the next, then you try to take a step.")
    time.sleep(10)
    print("However, the boots won't budge.")
    time.sleep(2)
    print("MISSION FAIL")
    time.sleep(1)
else:
    print("You climb up the ladder.")
    time.sleep(2)
    print("You see a guard at the top armed with an automatic rifle.")
    time.sleep(4)
    print("You can use the grenade in your pocket, or you can take him out with your pack of C4")
    time.sleep(5)
    b = eval(input("Enter 0 for grenade, 1 for the pack of C4: ")
    if b == 0:
        print("You throw the grenade up.")
        time.sleep(3)
        print("You hear a smack, and you see the grenade coming back down at you.")
        time.sleep(4)
        print("MISSION FAIL")
        print("Mental note: These guards are known for their fast reflexes.")
        time.sleep(3.5)

Answer 1

b=eval（…）行缺少“）”

应该是

b = eval(input(...))

而且它是

b = eval(input(...)

因此，语法错误