C++ vs Rust vs Python

C++ Rust (use std::collections::HashSet) Python (set())
Create
Empty 

unordered_set<string> us;
set of pairs 

using mpair = pair<double, double>;
struct Hash {
    size_t operator()(const mpair& p) const {
        return hash<double>()(p.first) ^ hash<double>()(p.second);
    }
};
unordered_set<mpair, Hash> us(s.begin(), s.end());
Filled
from String		 

string s = "abcda";
unordered_set<char> us(s.begin(), s.end());
n sets 
unordered_set<string> us(n);
Empty 
let mut hs:HashSet<String> = HashSet::new();
Filled
From String		 
let s = String::from("abcda");
let mut us:HashSet<char> = s.chars().collect();
Empty 
hs = set()
Filled 
//Copy words from vector
word: List[str]
hs = set(words)

# n sets
graph = [set() for _ in range(n)]
Find 
           
value = us[key]
value=count(key)
            
           
if let Some(value) = hs.get(&key) {
    //value returned
} else {
    // Not found
}
            
           
if key in hs:
    // contains key
Insert 
           
us.insert(key)
            
           
hs.insert(word);
            
           
for i in range(0, len(words)):
    hs.add(wordDict[i])