Big Update: New Sepolia Faucet Located Here.
\Kovan, Ropsten, and Rinkeby have been deprecated. Goerli Still works but we highly recommend Sepolia as its proof of stake based.
You'll need to verify via Twitter to get ETH & LINK.
You can find Backup Faucets here.
Additionally, lesson 7 uses Chainlink VRF v1 instead of v2, you can find the docs for Chainlink VRFv1 here.
YouTube Video
Welcome to the repository for the Ultimate Solidity, Blockchain, and Smart Contract - Beginner to Expert Full Course | Python Edition FreeCodeCamp course!
Table of Contents
Resources For This Course
Questions
Windows Support
Hiccups/Issues from the Video
Lesson 0: Welcome To Blockchain
What is a Blockchain?
Making Your First Transaction
How Do Blockchains Work?
Consensus
The Future
Miscellaneous
💻 Code: https://github.com/PatrickAlphaC/simple_storage
Everything in this section can be read about in the Solidity Documentation
Basic Solidity
- Versioning
- Compiling
- Contract Declaration
- Types & Declaring Variables
uint256, int256, bool, string, address, bytes32
- Default Initializations
- Comments
- Functions
- Deploying a Contract
- Calling a public state-changing Function
- Visibility
- Scope
- View & Pure Functions
- Structs
- Intro to Storage
- Arrays - Dynamic & Fixed sized
- Compiler Errors and Warnings
- Memory
- Mappings
- SPDX License
- Recap
Deploying to a "Live" network
- A testnet or mainnet
- Find a faucet here
- Connecting Metamask
- Interacting with Deployed Contracts
- The EVM
💻 Code: https://github.com/PatrickAlphaC/storage_factory
Inheritance, Factory Pattern, and Interacting with External Contracts
- Factory Pattern
- Imports
- Deploy a Contract From a Contract
- Interact With a Deployed Contract
- Recap
💻 Code: https://github.com/PatrickAlphaC/fund_me
Payable, msg.sender, msg.value, Units of Measure
Chainlink Oracles
- Decentralized Oracle Network Chainlink
- Blockchains can't make API calls
- Centralized Nodes are Points of Failure
- data.chain.link
- Getting External Data with Chainlink Oracles
Importing from NPM and Advanced Solidity
- Decimals/Floating Point Numbers in Solidity
- latestRoundData
- Importing from NPM in Remix
- Interfaces
- Getting Price Feed Addresses
- getPrice
- Tuples
- Matching Units (WEI/GWEI/ETH)
- getConversionRate
- Matching Units (Continued)
- SafeMath & Integer Overflow
- Setting a Threshold
- Require
- Revert
- Withdraw Function
- Transfer
- Balance
- this
- Contract Owners
- Constructor
- ==
- Modifiers
- Resetting
- for loop
- Array Length
- Forcing a Transaction
- Recap
💻 Code: https://github.com/PatrickAlphaC/web3_py_simple_storage
Installing VSCode, Python, and Web3
Our First Python Script with Web3.py - Deploying a Contract
- Reading our solidity file
- Running a Python Script in the Terminal
- MaxOS Shortcuts
- Windows Shortcuts
- Linux Shortcuts
- Compiling in Python
- py-solc-x
- Colorized Brackets
- JSON ABI
- Saving Compiled Code
- Formatting JSON
- Deploying in Python
- Get Bytecode
- Get ABI
- Choose Blockchain to Deploy To
- Web3.py
- HTTP / RPC Provider
- Private Keys MUST start with "0x"
- Contract Object
- Building a Transaction
- Account Nonce
- Calling "Constructor"
- Transaction Parameters
- Signing the Transaction
- NEVER put your private key directly in your code
- Setting Environment Variables (Windows, Linux, MacOS)
- Exported Environment Variables Only Last the Duration of the Shell/Terminal
- Private Key PSA
- .env file
- .gitignore
- Loading .env File in Python
- Viewing our Transaction / Deployment in Ganache
- Waiting for Block Confirmations
Interacting with Our Contract in Python & Web3.py
- 2 Things you always need
- Contract Address
- Contract ABI
- Getting address from transaction receipt
- Calling a view function with web3.py
- Updating State with Web3.py
- ganache-cli
- Working with ganache-cli
- Open a new terminal in the same window
- Deploying to a testnet
- Infura
- Alchemy
- Using Infura RPC URL / HTTP Provider
- Chain Ids
- Wow this seems like a lot of work... Is there a better way?
💻 Code: https://github.com/PatrickAlphaC/brownie_simple_storage
Brownie Introduction
Installing Brownie
Brownie Simple Storage Project
- A new Brownie project with
brownie init
- Project Basic Explanation
- Adding
SimpleStorage.sol to the contracts folder
- Compiling with
brownie compile
- Brownie deploy script
def main is brownie's entry point
- brownie defaults to a
development ganache chain that it creates
- Placing functions outside of the
main function
- brownie
accounts
- 3 Ways to Add Accounts
accounts[0]: Brownie's "default" ganache accounts
- Only works for local ganache
accounts.load("..."): Brownie's encrypted command line (MOST SECURE)
- Run
brownie accounts new <name> and enter your private key and a password
accounts.add(config["wallets"]["from_key"]): Storing Private Keys as an environment variable, and pulling from our brownie-config.yaml
- You'll need to add
dotenv: .env to your brownie-config.yaml and have a .env file
- Importing a Contract
- Contract.Deploy
- View Function Call in Brownie
- State-Changing Function Call in Brownie / Contract Interaction
transaction.wait(1)
Testing Basics
test_simple_storage.py- Arrange, Act, Assert
assertbrownie testtest_updating_storage- Pytest / Brownie Test Tips
- Deploy to a Testnet
brownie networks list- Development vs Ethereum
- Development is temporary
- Ethereum networks persist
- RPC URL / HTTP Provider in Brownie
- The network flag
get_account()networks.show_active()- build/deployments
- Accessing previous deployments
- Interacting with contracts deployed in our brownie project
[Brownie console]
💻 Code: https://github.com/PatrickAlphaC/brownie_fund_me
Introduction
Dependencies, Deploying, and Networks
- Dependencies
- chainlink-brownie-contracts
- remappings
- Deploy Script (V1)
helpful_scripts.py__init__.py- Deploy to Rinkeby
- Contract Verification (
publish_source)
- The Manual Way
- The Programmatic Way
- Interacting with Etherscan
- Deploying to Local Chains
- Introduction to Mocking
- Constructor Parameters
networks in our brownie-config.yaml- Copying Mock Contracts from chainlink-mix
- Deploying and using our mock
- Refactoring
- Deploying to a persistent ganache
- brownie attach
- Adding a persistent brownie network
- resetting a network build
Funding and Withdrawing Python Scripts
- Whoops! Let's fix an issue...
- Fund Script
- Withdraw Script
Testing across networks
test_can_fund_and_withdraw- default networks
- pytest
pip install pytest
- pytest.skip
- brownie exceptions
mainnet-fork- Custom mainnet fork
- Adding a development brownie network
brownie networks add development mainnet-fork-dev cmd=ganache-cli host=http://127.0.0.1 fork='https://infura.io/v3/$WEB3_INFURA_PROJECT_ID' accounts=10 mnemonic=brownie port=8545
- Alchemy
brownie test --network mainnet-fork- brownie ganache vs local ganache vs mainnet-fork vs testnet...
Git
Compatibility with Ganache UI
test_only_owner_can_withdraw() gives below error if the selected network is Ganache UI::
E ValueError: Execution reverted during call: 'VM Exception while processing transaction: revert'. This transaction will likely revert. If you wish to broadcast, include `allow_revert:True` as a transaction parameter.
More information here.
Lesson 7: [Smar
这是由 Chainlink 组织与 FreeCodeCamp 联合制作的免费 Solidity、区块链和智能合约课程（Python 版），从入门到进阶——这个仓库保存了 YouTube 课程的课程笔记、代码和资料。