Native Python support for units?

In Python (not math), the notation 10e1 is *not* a combined-multiplication-and-exponentiation operator applied to the arguments 10 and 1. Rather, it is another way of writing the float literal 100.0. Similarly, in Python, the j suffix is not a multiply-by-𝑖 postfix operator. Rather, it is the suffix for an imaginary literal. You cannot write some_varj and expect it to multiply some_var by 𝑖, nor can you write some_vare1 and expect it to multiply some_var by 10, because in both cases, the syntax is meant for constructing literals. This also means that both of these syntaxes have the highest possible precedence, since they're not proper operations at all, they're just literal notation. This cannot even be overridden by parentheses. 10e(1j) is a syntax error, not 10 × 10^𝑖. The latter can only be written explicitly using the * and ** operators (or equivalent functions from the cmath module).

To be even more pedantic: The imaginary literal syntax consists of a (real) float literal followed by the j suffix. So you have to parse a real literal before you can even deal with parsing an imaginary literal, and that's why the j has to bind less tightly than the e. If you had instead written 10 * 10 ** 1j, then the opposite would happen, and you really would get 10 × 10^𝑖 (i.e. the j binds more tightly than the exponent operator, contrary to PEMDAS and similar rules).