擅长:python、mysql、java
<p>在python中,同一个键不能有两次。字典中的每一个键都必须是唯一的。查看<a href="https://docs.python.org/3.6/library/stdtypes.html#dict" rel="nofollow noreferrer">documentation</a>:</p>
<blockquote>
<p>If a key occurs more than once, the last value for that key becomes the corresponding value in the new dictionary.</p>
</blockquote>
<p>字典是自动的,不考虑重复的键,它总是计算最后分配的键。</p>
<pre><code>duplicate_keys = {"ABab": 6.25, "aBab": 6.25, "Abab": 6.25, "abab": 6.25, "ABab": 6.25, "aBab": 6.25, "Abab": 6.25, "abab": 6.25, "ABab": 6.25, "aBab": 6.25, "Abab": 6.25, "abab": 6.25, "ABab": 6.25, "aBab": 6.25, "Abab": 6.25, "abab": 6.25}
unique_keys = {"ABab": 6.25, "aBab": 6.25, "Abab": 6.25, "abab": 6.25}
duplicate_keys == unique_keys # True
</code></pre>