On: An efficient way to make hash maps with insertion ...

[joshuamorton]

Note that this is an oversimplification, as

    p = Path('a.txt')
    q = Path('a.txt')

    p is q  # False

since p and q are different objects and "is" equality checks if the objects are the same (this can be interpreted approximately as "have the same memory address"), so it'll almost never be true. And in the cases where it is ( 2 is 2), you shouldn't rely on it, as most of them are optimizations.