Add sort_dict_by_key

snippets/sort_dict_by_key.md

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+---
+title: sort_dict_by_key
+tags: dictionary,intermediate
+---
+
+Sorts the given dictionary by key.
+
+- Use `dict.items()` to get a list of tuple pairs from `d` and sort it using `sorted()`.
+- Use `dict()` to convert the sorted list back to a dictionary.
+- Use the `reverse` parameter in `sorted()` to sort the dictionary in reverse order, based on the second argument.
+
+```py
+def sort_dict_by_key(d, reverse = False):
+  return dict(sorted(d.items(), reverse = reverse))
+```
+
+```py
+d = {'one': 1, 'three': 3, 'five': 5, 'two': 2, 'four': 4}
+sort_dict_by_key(d) # {'five': 5, 'four': 4, 'one': 1, 'three': 3, 'two': 2}
+sort_dict_by_key(d, True) # {'two': 2, 'three': 3, 'one': 1, 'four': 4, 'five': 5}
+```