Rust Platform

🎯 Python's classes can hold any type without declaring it:

class Container:
    def __init__(self, item):
        self.item = item

Container(42)
Container("hello")
Container([1, 2, 3])

No type declarations needed — item can be anything. With type hints, you can be more specific:

from typing import Generic, TypeVar
T = TypeVar("T")

class Container(Generic[T]):
    def __init__(self, item: T):
        self.item = item

But Python's generics are only for type checkers. At runtime, Container[int] and Container[str] are the same class.

Rust's generic structs are different — they're real, distinct types at compile time:

struct Container<T> {
    item: T,
}

// Container<i32> and Container<String> are different types
// The compiler generates optimized code for each

Defining generic structs

The <T> after the struct name declares a type parameter. Use it in fields:

struct Container<T> {
    item: T,
}

struct Entry<K, V> {
    key: K,
    val: V,
}

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