Reorganize snippets

python/s/find-keys.md

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+---
+title: Find keys with value
+type: snippet
+language: python
+tags: [dictionary]
+cover: laptop-plants-2
+dateModified: 2020-11-02T19:27:53+02:00
+---
+
+Finds all keys in the provided dictionary that have the given value.
+
+- Use `dictionary.items()`, a generator and `list()` to return all keys that have a value equal to `val`.
+
+```py
+def find_keys(dict, val):
+  return list(key for key, value in dict.items() if value == val)
+```
+
+```py
+ages = {
+  'Peter': 10,
+  'Isabel': 11,
+  'Anna': 10,
+}
+find_keys(ages, 10) # [ 'Peter', 'Anna' ]
+```