if语句中的if语句

Question

这是我的家庭作业，我坚持让代码变成一个后续问题，就像这里的代码，我试着在后面插入一个if语句，但它给了我一个意想不到的提示错误。

到目前为止，我的代码如下：

Choice = input("Hello! Do you want to buy or sell snakes? Please enter (b) or (s) :")
if Choice == "b":
    buySnake = input ("What snake do you want to buy? We are selling python, kingsnake, rattlesnake, deathadder, cobra, mamba, viper and gartersnake. Please choose one : ")
        if buySnake == "python":
             return (to be added)   
elif Choice == "s":
    sellFsnakes(snakeList,name,amount)
else:
    print("Please try again.")
    buyWsnakes(snakeList,name,amount)

Answer 1

你有一个额外的缩进。只需删除额外的缩进级别：

Choice = input("Hello! Do you want to buy or sell snakes? Please enter (b) or (s) :")
if Choice == "b":
    buySnake = input ("What snake do you want to buy? We are selling python, kingsnake, rattlesnake, deathadder, cobra, mamba, viper and gartersnake. Please choose one : ")
    if buySnake == "python":
        return (to be added)   
elif Choice == "s":
    sellFsnakes(snakeList,name,amount)
else:
    print("Please try again.")
    buyWsnakes(snakeList,name,amount)

Answer 2

缩进是在Python中创建代码块的方法。你的错误恰好说明了你做错了什么。

if condition:
    # executes if condition is met
    if internalCondition:
        # executes if both condition and internalCondition is met
elif otherCondition:
    # executes if first statement didn't and otherCondition is met
else:
    # executes if nothing else executed

您使用多余的空格缩进了if internalCondition:。