我的 wordnet python 代码中发生错误：IndexError;列表索引超出范围

Question

我正在编写一些小代码，但错误

IndexError: list index out of range

总是在执行最后一行代码之后出现，有什么帮助吗？

from nltk.corpus import wordnet  # this is where you load the wordnet corpus

user_input = input("What should I reverse, user?")  # this is where you get the items for the string

str = user_input  # this is the initial string

stringlength = len(str)  # this is where you calculate length of the list

slicedString = str[stringlength::-1]  # this is where you start slicing

syns = wordnet.synsets(slicedString)  # this gives the reversed word to the dictionary

print(syns[0].definition())  # this prints the meaning (if there is one)

我在书中寻找答案，但没有任何效果。 (PyCharm Edu 4.0)

Answer 1

显然，syns 不是长度至少为 1 的列表或元组。您是否尝试打印此变量以查看它是否包含值？