struct.pack produces raw binary data. In Python 3.x, this is represented by the bytes type; in 2.x, bytes is an alias for str. In Python 3, indexing a bytes object returns the integer value of the byte: >>> b”abc”[1] 98 Thus, the ord calls are redundant in the original code, and should be removed.
It stands for “ordinal”. The earliest use of ord that I remember was in Pascal. There, ord() returned the ordinal value of its argument. For characters this was defined as the ASCII code. The same convention was also used in Modula-2. Later, Python (as well as PHP, some dialects of SQL etc) followed this convention, … Read more
The definition of Ord is this: pub trait Ord: Eq + PartialOrd<Self> { fn cmp(&self, other: &Self) -> Ordering; } Any type that implements Ord must also implement Eq and PartialOrd<Self>. You must implement these traits for SomeNum. Incidentally, your implementation looks like being the wrong way round; if self.value is all you are comparing, … Read more