【“笨办法”学Python】31.做出决定——if、else、elif 和嵌套

31.做出决定——if、else、elif 和嵌套

• 前言
• 一、Atom文本编辑器
• 二、运行Python程序
• 总结

  if、else 和 elif可以创建包含条件判断的脚本。

print("""You enter a dark room with two doors.
Do you go through door #1 or door #2 ?""")

door = input("> ")

if door == "1":
    print("There's a giant bear here eating a cheese cake.")
    print("What do you do?")
    print("1. Take the cake.")
    print("2. Scream at the bear.")

    bear = input("> ")

    if bear == "1":
        print("The bear eats your face off. Good job!")
    elif bear == "2":
        print("The bear eats your legs off. Good job!")
    else:
        print(f"Well, doing {bear} is probably better.")
        print("Bear run away.")

elif door == "2":
    print("You stare into the nedless abyss at Cthulhu's retina.")
    print("1. Blueberries.")
    print("2. Yellow jacket clothespins.")
    print("3. Understanding revolvers yelling melodies.")

    insanity = input("> ")

    if insanity == "1" or insanity == "2":
        print("Your body survives powered by a mind of jello.")
        print("Good job!")
    else:
        print("The insanity rots yours eyes into a pool of muck.")
        print("Good job!")
else:
    print("You stumble around and fall on a knife and die. Good job!")

  这里的重点是可以在if语句的内部在放一个if语句作为可运行的代码。这是一个强大的功能，可以用来创建嵌套的决定，其中的一个分支将引向另一个分支的子分支。

  在Window上键入Python就可以看到结果。

python ex31.py

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