‘‘‘
已有word_index，格式如下
{‘word1‘: 1,
‘word2‘: 2,
‘word3‘: 3,
...
}
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# 快速互换
index_word_map = {v:k for k,v in word_index.items()}
‘‘‘
{1:‘word1‘,
2:‘word2‘,
3:‘word3‘,
...
}
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Python 字典 键值和字典值互换 key和value互换
原文：https://www.cnblogs.com/amilychensblog/p/14778943.html