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Learn Vyper - 10 Code Examples & CST Typing Practice Test

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.

View all 10 Vyper code examples →
Simple Counter ContractOwner-Only StorageSimple Bank (Deposit + Withdraw)ERC20-Like Token (Minimal)Timestamp LockerSimple VotingWhitelist AccessEvent LoggerImmutable ConfigSimple Multiplier

Learn VYPER with Real Code Examples

Updated Nov 25, 2025

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

Basic Concepts Overview

Functions with strict typing

Events for logging

State variables with visibility

Custom structs

Fallback and default functions

Project Structure

contracts/ - Vyper source files

tests/ - Python tests

scripts/ - deployment scripts

interfaces/ - .vy interface files

build/ - compiled artifacts

Building Workflow

Write Vyper (.vy) file

Compile to bytecode + ABI

Test and audit logic

Deploy via Brownie/Web3.py

Interact using generated ABI

Difficulty Use Cases

Beginner: simple ERC-20

Intermediate: vaults, staking

Advanced: governance logic

Expert: DeFi primitives

Auditor: security proofs

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.

Versioning Timeline

2017 - Initial Vyper prototype

2019 - First stable compiler

2021 - Major compiler upgrade

2023 - EVM opcodes alignment

2024-2025 - Ongoing security/perf improvements

Glossary

ABI: contract interface

Bytecode: EVM machine code

Decorator: function annotation

State variable: persistent storage

Event: logged data on-chain

Installation Setup

Install Python

pip install vyper

Verify using `vyper --version`

Compile contract using `vyper file.vy`

Deploy using Web3, Brownie, or Foundry

Environment Setup

Install Python

Install Vyper via pip

Set up Brownie

Connect to testnet

Compile & deploy contracts

Config Files

vyper-config.json

brownie-config.yaml

deployment scripts

compiler settings

interface .vy files

Cli Commands

vyper file.vy

vyper-json file.json

vyper --show-ast file.vy

vyper --abi file.vy

vyper --bytecode file.vy

Internationalization

Docs available widely

Community translations

Global Ethereum developer support

Unicode-safe

Cross-chain EVM compatibility

Accessibility

Python-like syntax helps beginners

Readable code structure

Extremely simple language surface

Safe defaults reduce errors

Clear compiler messages

Ui Styling

Not applicable (backend language)

IDE support minimal

Syntax-based highlighting

Compiler error styling

Remix Vyper plugin UI

State Management

Storage variables

Immutable constants

Mappings

Struct-based records

Event logs

Data Management

Storage layout is static

No dynamic arrays (unless bounded)

Strict struct definitions

ABI-compatible data

Event logs for indexing

Architecture

Vyper compiler -> EVM bytecode

Strict static typing system

Linear, restricted syntax model

Gas-optimized code generation

Formal verification-friendly design

Rendering Model

Vyper -> AST -> IR -> EVM bytecode

Static type checker

Opcode optimization layer

Strict compile-time verification

No dynamic dispatch

Architectural Patterns

Procedural contract design

Interface-based composition

Linear smart contract logic

Event-driven state changes

Explicit, non-inherited structures

Real World Architectures

DeFi lending protocols

DAO treasury managers

Staking pools

Token vaults

Governance modules

Design Principles

Security first

Minimalistic syntax

No surprises philosophy

Readable, auditable code

Formal verification compatibility

Scalability Guide

Use interfaces for modularity

Avoid unbounded loops

Split logic into multiple contracts

Optimize storage layout

Keep functions short and clear

Migration Guide

Rewrite Solidity contracts in Vyper

Remove modifiers and inheritance

Flatten logic into simple functions

Define structs instead of classes

Test using Brownie or Ape

Performance Notes

Designed for predictable gas usage

No complex inheritance -> faster execution

Static typing improves compiler safety

Loops must be strictly bounded

Ideal for minimalistic codebases

Security Notes

No unbounded loops allowed

Overflow safe by default

No inline assembly -> safer

Strict compiler prevents misuse

Easy to formally verify

Monitoring Analytics

Track event logs

Gas usage measurement

On-chain analytics dashboards

Audit tool outputs

Security monitoring systems

Code Quality

Use descriptive variable names

Restrict function visibility

Include events for all key actions

Avoid complex branching

Document assumptions clearly

Practical Examples

Minimal ERC-20 token

Treasury vault

DAO voting contract

Time-locked withdrawals

Staking and reward distribution

Troubleshooting

Check indentation errors

Fix type mismatch warnings

Verify function visibility

Validate event definitions

Ensure gas-optimized loops

Testing Guide

Use Brownie for Python tests

Mock interfaces

Assert event logs

Check reverts using `reverts()`

Test gas usage

Deployment Options

Brownie deployment scripts

Web3.py manual deployment

ApeWorx deploy

Hardhat Vyper plugin

Remix Vyper integration

Tools Ecosystem

Vyper Compiler

Brownie Framework

ApeWorx (Ape)

Web3.py

Etherscan Vyper verifier

Integrations

Ethereum mainnet + L2s

Brownie Python testing

Hardhat (via plugins)

Foundry (experimental)

EVM-compatible chains like Arbitrum and Optimism

Productivity Tips

Keep contracts small

Use interfaces wisely

Rely on Brownie for testing

Simplify state transitions

Avoid unnecessary features

Challenges

Debugging is more minimal

Smaller ecosystem

Missing some Solidity conveniences

Must architect without inheritance

Testing requires external tools

Learning Path

Learn Python basics

Understand EVM

Write minimal contracts

Master Vyper syntax

Learn auditing & gas optimization

Skill Improvement Plan

Week 1: Vyper syntax

Week 2: Events + functions

Week 3: Interfaces + ABI

Week 4: Security testing

Week 5: Build DeFi primitives

Interview Questions

Why choose Vyper over Solidity?

What features does Vyper intentionally remove?

How do events work in Vyper?

Explain Vyper’s security philosophy.

What are Vyper restrictions on loops?

Cheat Sheet

@external -> public function

@view -> read-only

@payable -> accept ETH

event Transfer: ...

struct User: ...

Books

Mastering Ethereum (Vyper sections)

Vyper Smart Contract Development

Secure DeFi Programming

Ethereum Patterns and Practices

Practical Smart Contracts

Tutorials

Write your first Vyper contract

ERC20 in Vyper

DAO voting in Vyper

Testing with Brownie

Security best practices

Official Docs

https://vyper.readthedocs.io

https://github.com/vyperlang/vyper

Community Links

Vyper GitHub Discussions

Ethereum Magicians

Discord Vyper Community

YouTube tutorials

Brownie + Ape forums

Community Support

Vyper GitHub

Ethereum Magicians

Vyper Discord

StackOverflow

Brownie + Ape communities

Monetization

Develop audited contracts

Write DeFi Vyper modules

Offer security audits

Sell DAO governance templates

Consult enterprise blockchain teams

Future Roadmap

Better compiler performance

More optimization passes

Better IDE support

Expanded plugin system

More formal verification tools

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

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.

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.

Code Sample Descriptions

1

Simple Counter Contract

count: public(uint256)

@external
def __init__():
    self.count = 0

@external
def increment():
    self.count += 1

@external
def reset():
    self.count = 0

A minimal counter smart contract using Vyper with increment and reset functions.

Let’s Try →
2

Owner-Only Storage

owner: public(address)
message: public(String[100])

@external
def __init__():
    self.owner = msg.sender
    self.message = ""

@external
def set_message(new_message: String[100]):
    assert msg.sender == self.owner
    self.message = new_message

A contract where only the owner can update a stored message.

Let’s Try →
3

Simple Bank (Deposit + Withdraw)

balances: public(HashMap[address, uint256])

@payable
@external
def deposit():
    self.balances[msg.sender] += msg.value

@external
def withdraw(amount: uint256):
    assert self.balances[msg.sender] >= amount
    self.balances[msg.sender] -= amount
    send(msg.sender, amount)

A tiny bank contract allowing users to deposit and withdraw ETH.

Let’s Try →
4

ERC20-Like Token (Minimal)

total_supply: public(uint256)
balances: public(HashMap[address, uint256])

@external
def __init__(_s: uint256):
    self.total_supply = _s
    self.balances[msg.sender] = _s

@external
def transfer(to: address, amount: uint256):
    assert self.balances[msg.sender] >= amount
    self.balances[msg.sender] -= amount
    self.balances[to] += amount

A simplified ERC20-style token for demonstration purposes.

Let’s Try →
5

Timestamp Locker

unlock_time: public(uint256)

@payable
@external
def __init__(_unlock: uint256):
    self.unlock_time = _unlock

@external
def withdraw():
    assert block.timestamp >= self.unlock_time
    send(msg.sender, self.balance)

A simple timelock contract where ETH can only be withdrawn after a specific timestamp.

Let’s Try →
6

Simple Voting

yes: public(uint256)
no: public(uint256)

@external
def vote(choice: bool):
    if choice:
        self.yes += 1
    else:
        self.no += 1

A tiny voting system with yes/no votes.

Let’s Try →
7

Whitelist Access

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] == True

A contract that allows only whitelisted addresses to perform an action.

Let’s Try →
8

Event Logger

event Log:
    creator: address
    message: String[100]

@external
def fire(msg: String[100]):
    log Log(msg.sender, msg)

A simple example of Vyper events.

Let’s Try →
9

Immutable Config

CONFIG: immutable(uint256)

@external
def __init__(v: uint256):
    CONFIG = v

@external
def get_config() -> uint256:
    return CONFIG

Shows how to use `immutable` variables in Vyper.

Let’s Try →
10

Simple Multiplier

factor: public(uint256)

@external
def __init__(_factor: uint256):
    self.factor = _factor

@external
def multiply(x: uint256) -> uint256:
    return x * self.factor

A utility contract that multiplies a number by a constant stored in the contract.

Let’s Try →

Frequently Asked Questions about Vyper

What is Vyper?

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.

What are the primary use cases for Vyper?

High-assurance smart contracts. DeFi protocols and vaults. Governance and treasury contracts. Security-audited financial logic. Minimalistic EVM dApps

What are the strengths of Vyper?

High security and predictability. Easy to read and audit. Minimal attack surface. Formally verifiable. Ideal for critical DeFi contracts

What are the limitations of Vyper?

No inheritance. No modifiers. Limited built-in tooling vs Solidity. Smaller ecosystem. Not ideal for highly complex contracts

How can I practice Vyper typing speed?

CodeSpeedTest offers 10+ real Vyper code examples for typing practice. You can measure your WPM, track accuracy, and improve your coding speed with guided exercises.

Learn Other Programming Languages

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