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event Log:
creator: address
message: String[100]
@external
def fire(msg: String[100]):
log Log(msg.sender, msg)Coding works best on desktop or with an external keyboard.
Event Logger - Vyper Typing CST Test
Event Logger — Vyper Code
A simple example of Vyper events.
event Log:
creator: address
message: String[100]
@external
def fire(msg: String[100]):
log Log(msg.sender, msg)Vyper 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.
Quick Explain
- ▸Vyper syntax is inspired by Python but intentionally limited for security.
- ▸It removes complex features to reduce attack surfaces (no modifiers, no inheritance).
- ▸Compiled directly to Ethereum Virtual Machine bytecode.
- ▸Designed for formal verification and auditing.
- ▸Used by DeFi, security-critical dApps, and DAO contracts.
Core Features
- ▸Events and logs
- ▸Interfaces
- ▸Custom structs
- ▸ABI compatibility with Solidity
- ▸EVM-level optimization
Learning Path
- ▸Learn Python basics
- ▸Understand EVM
- ▸Write minimal contracts
- ▸Master Vyper syntax
- ▸Learn auditing & gas optimization
Practical Examples
- ▸Minimal ERC-20 token
- ▸Treasury vault
- ▸DAO voting contract
- ▸Time-locked withdrawals
- ▸Staking and reward distribution
Comparisons
- ▸Vyper vs Solidity: Vyper is safer but has fewer features.
- ▸Vyper vs Rust-based languages: Vyper is simpler but less powerful.
- ▸Vyper vs Yul: Vyper is high-level; Yul is low-level.
- ▸Vyper vs Cairo: Cairo targets STARK VMs; Vyper targets EVM.
- ▸Vyper vs Move: Move is resource-based; Vyper is minimalistic.
Strengths
- ▸High security and predictability
- ▸Easy to read and audit
- ▸Minimal attack surface
- ▸Formally verifiable
- ▸Ideal for critical DeFi contracts
Limitations
- ▸No inheritance
- ▸No modifiers
- ▸Limited built-in tooling vs Solidity
- ▸Smaller ecosystem
- ▸Not ideal for highly complex contracts
When NOT to Use
- ▸Highly complex inheritance-based systems
- ▸Large modular contract architectures
- ▸Contracts requiring inline assembly
- ▸Custom low-level opcodes
- ▸Massive multi-file OOP-style programs
Cheat Sheet
- ▸@external -> public function
- ▸@view -> read-only
- ▸@payable -> accept ETH
- ▸event Transfer: ...
- ▸struct User: ...
FAQ
- ▸Is Vyper safer than Solidity?
- ▸Yes - by design.
- ▸Is Vyper widely used?
- ▸Yes in DeFi and audited contracts.
- ▸Does Vyper support inheritance?
- ▸No - intentionally removed.
- ▸Is Vyper slower?
- ▸No - often more gas-efficient.
- ▸Can Vyper and Solidity interact?
- ▸Yes - ABI compatible.
30-Day Skill Plan
- ▸Week 1: Vyper syntax
- ▸Week 2: Events + functions
- ▸Week 3: Interfaces + ABI
- ▸Week 4: Security testing
- ▸Week 5: Build DeFi primitives
Final Summary
- ▸Vyper is a secure, minimal, Python-like EVM language.
- ▸Ideal for high-assurance and audited smart contracts.
- ▸No modifiers, no inheritance, less complexity.
- ▸Used widely in DeFi, DAOs, and financial logic.
- ▸Perfect for developers who value safety + clarity.
Project Structure
- ▸contracts/ - Vyper source files
- ▸tests/ - Python tests
- ▸scripts/ - deployment scripts
- ▸interfaces/ - .vy interface files
- ▸build/ - compiled artifacts
Monetization
- ▸Develop audited contracts
- ▸Write DeFi Vyper modules
- ▸Offer security audits
- ▸Sell DAO governance templates
- ▸Consult enterprise blockchain teams
Productivity Tips
- ▸Keep contracts small
- ▸Use interfaces wisely
- ▸Rely on Brownie for testing
- ▸Simplify state transitions
- ▸Avoid unnecessary features
Basic Concepts
- ▸Functions with strict typing
- ▸Events for logging
- ▸State variables with visibility
- ▸Custom structs
- ▸Fallback and default functions