Whitelist Access - Vyper Typing CST Test
Loading…
Whitelist Access — Vyper Code
A contract that allows only whitelisted addresses to perform an action.
owner: public(address)
whitelist: public(HashMap[address, bool])
@external
def __init__():
self.owner = msg.sender
@external
def add_user(user: address):
assert msg.sender == self.owner
self.whitelist[user] = True
@external
def restricted_action():
assert self.whitelist[msg.sender] == TrueVyper Language Guide
Vyper is a security-focused, Python-like smart contract programming language for the Ethereum Virtual Machine (EVM). It emphasizes simplicity, readability, and auditability-making it ideal for high-assurance smart contracts.
Primary Use Cases
- ▸High-assurance smart contracts
- ▸DeFi protocols and vaults
- ▸Governance and treasury contracts
- ▸Security-audited financial logic
- ▸Minimalistic EVM dApps
Notable Features
- ▸Python-like syntax
- ▸Strong typing and safety checks
- ▸No modifiers -> predictable flow
- ▸No inheritance -> reduced complexity
- ▸Built-in overflow/underflow protection
Origin & Creator
Vyper was created by the Ethereum Foundation with contributions from Vitalik Buterin and the research team. It emerged around 2017 as a safer alternative to Solidity.
Industrial Note
Vyper is heavily used in high-stakes DeFi protocols, DAO governance, staking pools, and security-critical Ethereum contracts where simplicity and predictability matter more than feature richness.