how can I sort a dictionary in python according to its keys? code example

Example 1: how can I sort a dictionary in python according to its values?

s = {1: 1, 7: 2, 4: 2, 3: 1, 8: 1}
k = dict(sorted(s.items(),key=lambda x:x[0],reverse = True))
print(k)

Example 2: sort dictionary by key

dictionary_items = a_dictionary.items()
sorted_items = sorted(dictionary_items)