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python/snippets/find-key.md

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+---
+title: Find key of value
+type: snippet
+tags: [dictionary]
+cover: blue-red-mountain
+dateModified: 2020-11-02T19:27:53+02:00
+---
+
+Finds the first key in the provided dictionary that has the given value.
+
+- Use `dictionary.items()` and `next()` to return the first key that has a value equal to `val`.
+
+```py
+def find_key(dict, val):
+  return next(key for key, value in dict.items() if value == val)
+```
+
+```py
+ages = {
+  'Peter': 10,
+  'Isabel': 11,
+  'Anna': 9,
+}
+find_key(ages, 11) # 'Isabel'
+```