25 lines
509 B
Markdown
25 lines
509 B
Markdown
---
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title: Find key of value
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tags: dictionary,intermediate
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firstSeen: 2020-04-16T19:13:20+03:00
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lastUpdated: 2020-11-02T19:27:53+02:00
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---
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Finds the first key in the provided dictionary that has the given value.
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- Use `dictionary.items()` and `next()` to return the first key that has a value equal to `val`.
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```py
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def find_key(dict, val):
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return next(key for key, value in dict.items() if value == val)
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```
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```py
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ages = {
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'Peter': 10,
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'Isabel': 11,
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'Anna': 9,
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}
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find_key(ages, 11) # 'Isabel'
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```
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