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29 lines
972 B
XML
29 lines
972 B
XML
<!DOCTYPE qhelp PUBLIC
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"-//Semmle//qhelp//EN"
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"qhelp.dtd">
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<qhelp>
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<overview>
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<p>Dictionary literals are constructed in the order given in the source.
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This means that if a key is duplicated, the second key-value pair will overwrite
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the first; as a dictionary can only have one value per key.
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</p>
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</overview>
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<recommendation>
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<p>Check for typos to ensure that the keys are supposed to be the same.
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If they are then decide which value is wanted and delete the other one.</p>
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</recommendation>
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<example>
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<p>The following example will output <code>"c"</code>, because the mapping between 2 and <code>"b"</code> is overwritten by the
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mapping from 2 to <code>"c"</code>. The programmer may have meant to map 3 to <code>"c"</code> instead.</p>
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<sample src="DuplicateKeyInDictionaryLiteral.py" />
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</example>
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<references>
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<li>Python: <a href="http://docs.python.org/3/reference/expressions.html#dictionary-displays">Dictionary literals</a>.</li>
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</references>
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</qhelp>
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