Add invert_dictionary

snippets/invert_dictionary.md

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+---
+title: invert_dictionary
+tags: dictionary,intermediate
+---
+
+Inverts a dictionary with unique hashable values.
+
+Use `dictionary.items()` in combination with a list comprehension to create a new dictionary with the values and keys inverted.
+
+```py
+def invert_dictionary(obj):
+  return { value: key for key, value in obj.items() }
+```
+
+```py
+ages = {
+  "Peter": 10,
+  "Isabel": 11,
+  "Anna": 9,
+}
+invert_dictionary(ages) # { 10: "Peter", 11 "Isabel", 9: "Anna" }
+```