I am not sure when the python syntax become such a beacon of quality, but that makes me genuinely sad; Especially with looking at all the other syntax (swift, kotlin, F#/ocaml, rust) out there.
I obviously don't have experience with Python, but the only good thing about the syntax to my eyes is the vertical space savings you gain by doing away with curly braces.
[i*i for i in range(10)] is hardly terse or cryptic.
Python regular expressions are much like regular expressions anywhere else, so you're not really criticising Python there. You might need extra backslashes if you were trying to do them without raw strings (r'\s*' == '\\s*'), but that's hardly unique to Python either.
But…that’s not how you format “private” symbols in Python, conventionally; single leading underscore is; double leading is for identifiers you want mangled with classnames, and double leading and trailing is for special methods.
That‘s not random syntax trivia. It‘s a slice. Pretty generic and straighforward.
That said system languages have a disadvantage, they can't even concatenate two strings 'simply'.
That being said, string concatenation is only marginally related to syntax. It's a matter of semantics, which go much deeper. There is a very good reason for which string concatenation isn't simpler in Rust.