1Python 3.6.9 (default, Oct 8 2020, 12:12:24)
2[GCC 8.4.0] on linux
3Type "help", "copyright", "credits" or "license" for more information.
4>>> a = {'a': 123, 'c': 5}
5>>> b = {'a': 2, 'b': 4}
6>>> a.keys() & b.keys() # intersection
7{'a'}
8>>> a.keys() ^ b.keys() # difference
9{'b', 'c'}
10>>> a.keys() - b.keys() # subtraction
11{'c'}