# 结构模式匹配

lunch_order = "taco"

# 在最基本的使用情况下,可以使用可能出现的不同值来检查一个变量,这称为文本模式。
match lunch_order:
 case "pizza":
 print("Pizza time!")
 case "sandwich":
 print("Here's your sandwich")
 case "taco":
 print("Taco, taco, TACO, tacotacotaco!")
 case _:
 # 下画线(_)是通配符,它将匹配任何值。这称为回退 case,必须放在最后,因为它将匹配任何内容。
 print("Yummy.")


match lunch_order:
 case "taco":
 print("Taco, taco, TACO, tacotacotaco!")
 case "salad" | "soup":
 # 使用 or 模式,其中可能的字面值由竖线分隔
 print("Eating healthy, eh?")
 case _:
 print("Yummy.")

match lunch_order:
 case "salad" | "soup":
 print("Eating healthy, eh?")
 case order:
 # 捕获模式,除了实现回退 Case 的效果之外,还会捕获到匹配的值。
 print(f"Enjoy your {order}.")

lunch_order = ["taco", "salad"]

match lunch_order:
 case "salad" | "soup":
 print("Eating healthy, eh?")
 case (flavor, "salad"):
 # 捕获模式,支持匹配元组或列表(序列)
 print(f"Enjoy your {order}.")


class Special:
 today = "sandwich"


pizza = "pizza"
lunch_order = "soup"
match lunch_order:
 case Special.today:
 # 有限定的名称,相当于读取变量
 print("Here's your sandwich")
 case "taco":
 print("Taco, taco, TACO, tacotacotaco!")
 case pizza:
 # 所有未限定的名称(即不含点号的简单变量名称)都将用于捕获。
 print("变量 pizza 实现为捕获模式")


lunch_order = "soup"
match lunch_order:
 case "taco":
 print("Taco, taco, TACO, tacotacotaco!")
 case so if "so" in so:
 # 为匹配模式添加额外的条件
 print(f"匹配到 {so}")
 case order:
 print(f"Enjoy your {order}.")