KeyError：字典和输入

Question

我收到一个 KeyError。 else 块不起作用。当输入超出字典时，它会不断给出 KeyError，但它应该 print("problem")

如果您知道解决此问题的方法，请告诉我。谢谢。

words = {"good night": ["nighty night", "good night", "sleep well"],
         "good morning": ["good morning", "wakey-wakey!", "rise and shine!"]}

text_punk = input("text something: ")

punk = random.choice(words[text_punk])


if text_punk in words:
    print(punk)
    talk(punk) #this is for pyttsx3
else:
    print("problem!")

Answer 1

在此代码中，在您检查 if text_punk in words 之前引发了异常：

punk = random.choice(words[text_punk])  # might raise

if text_punk in words:
    print(punk)
    talk(punk) #this is for pyttsx3
else:
    print("problem!")

您可以通过在分配punk 之前检查words 来修复它：

if text_punk in words:
    punk = random.choice(words[text_punk])  # shouldn't raise
    print(punk)
    talk(punk) #this is for pyttsx3
else:
    print("problem!")

或使用try/except 代替if/else：

try:
    punk = random.choice(words[text_punk])  # might raise
    print(punk)
    talk(punk) #this is for pyttsx3
except KeyError:
    print("problem!")