Python if分支执行后未按预期终止 实现游戏流程控制与重启循环

你的分支判断只处理了「选right时打印失败提示」的逻辑，没有做流程终止或跳转，所以分支代码执行完后，程序会按顺序继续往下运行，自然就弹出了step2的输入提示。

方案1：选错直接终止程序 #

最简单的改法，在right分支打印完失败提示后，加一行exit()直接终止程序运行即可。另外你原来判断right的时候没加.lower()，用户输入大写的Right/RIGHT会匹配失败，顺手给你补上。
修改后的step1段代码：

step1 = input(" Do you pick left or right? ")

if step1.lower() == "left":
  print("congratulations you have avoid the pit of snakes! and moved to your next choice!")
elif step1.lower() == "right":
  print("""

         OH no you fell into a pit full of SNAKES!

       
    --..,_                     _,.--.
       `'.'.                .'`__ o  `;__.      
          '.'.            .'.'`  '---'`  `
            '.`'--....--'`.'
              `'--....--'`



""")
  exit() # 执行到这里直接终止程序，不会继续往下跑step2

step2 = input("You come up to a lake do you wait or do you swim? ")

方案2：失败后支持重启游戏 #

要实现重开逻辑，给整个游戏套一层外层循环即可，失败后询问用户意愿，选重开就回到游戏初始流程，选退出就终止程序。
参考实现结构：

while True:
  # 游戏开场逻辑
  print('''
*******************************************************************************
          |                   |                  |                     |
 _________|________________.=""_;=.______________|_____________________|_______
|                   |  ,-"_,=""     `"=.|                  |
|___________________|__"=._o`"-._        `"=.______________|___________________
          |                `"=._o`"=._      _`"=._                     |
 _________|_____________________:=._o "=._."_.-="'"=.__________________|_______
|                   |    __.--" , ; `"=._o." ,-"""-._ ".   |
|___________________|_._"  ,. .` ` `` ,  `"-._"-._   ". '__|___________________
          |           |o`"=._` , "` `; .". ,  "-._"-._; ;              |
 _________|___________| ;`-.o`"=._; ." ` '`."\` . "-._ /_______________|_______
|                   | |o;    `"-.o`"=._``  '` " ,__.--o;   |
|___________________|_| ;     (#) `-.o `"=.`_.--"_o.-; ;___|___________________
____/______/______/___|o;._    "      `".o|o_.--"    ;o;____/______/______/____
/______/______/______/_"=._o--._        ; | ;        ; ;/______/______/______/_
____/______/______/______/__"=._o--._   ;o|o;     _._;o;____/______/______/____
/______/______/______/______/____"=._o._; | ;_.--"o.--"_/______/______/______/_
____/______/______/______/______/_____"=.o|o_.--""___/______/______/______/____
/______/______/______/______/______/______/______/______/______/______/_____ /
*******************************************************************************
''')
  print("Welcome to Treasure Island.")
  print("Your mission is to find the treasure.") 

  name = input("What is your Name ? ")
  print(f"Welcome {name} to the Treasure Island game. Lets get started!")

  game_over = False
  step1 = input(" Do you pick left or right? ")
  if step1.lower() == "left":
    print("congratulations you have avoid the pit of snakes! and moved to your next choice!")
  elif step1.lower() == "right":
    print("""

         OH no you fell into a pit full of SNAKES!

       
    --..,_                     _,.--.
       `'.'.                .'`__ o  `;__.      
          '.'.            .'.'`  '---'`  `
            '.`'--....--'`.'
              `'--....--'`



""")
    game_over = True

  # 失败后走重启询问逻辑
  if game_over:
    restart = input("Game Over! 输入y重新开始游戏，按其他键退出：")
    if restart.lower() == "y":
      continue # 回到循环开头，重开游戏
    else:
      break # 跳出循环，结束程序

  # 后续关卡逻辑写在这里
  step2 = input("You come up to a lake do you wait or do you swim? ")
  # 后续step2、step3等所有失败分支，只要把game_over设为True即可，会自动走上面的重启询问流程

你之后写其他关卡的失败分支时，要么直接调用exit()终止程序，要么标记game_over = True走重启逻辑，不要让执行流自然落到后续关卡的代码上，就不会再出现选错选项还能继续推进剧情的问题。

内容的提问来源于stack exchange，提问作者Saqib Munir