Develop & Deploying your first Ethereum Smart Contract with Solidity and python in VSCode on Debian and Ubuntu-based distributions

Let’s start with the basics.

What is a Smart Contract?

“Smart contracts are a type of Ethereum account. This means they have a balance and they can send transactions over the network. However they’re not controlled by a user, instead they are deployed to the network and run as programmed. User accounts can then interact with a smart contract by submitting transactions that execute a function defined on the smart contract. Smart contracts can define rules, like a regular contract, and automatically enforce them via the code. Smart contracts cannot be deleted by default, and interactions with them are irreversible.” ~ Ethereum.org

What is Solidity?

“Solidity is an object-oriented, high-level language for implementing smart contracts. Smart contracts are programs which govern the behavior of accounts within the Ethereum state.” ~ docs.soliditylang.org

Procedure:

1. Setup VSCode. If you haven’t, click here.
2. Integrate python in VSCode for deployment. If you haven’t, click here.
3. Integrate Solidity for compiling. If you haven’t click here.
4. Creating smart Contract:
   I am creating a smart contract file named “simpleStorage.sol”.

// SPDX-License-Identifier: MIT;
//define solidity version
// pragma solidity >=0.6.0 <0.9.0;
// pragma solidity 0.6.0;//specific
// pragma solidity ^0.6.0;//every version of 0.6
pragma solidity ^0.8.0;
// defining contract like a lass in oop
contract SimpleStorage{
//data types
// uint256 favouriteNumber=5;
// uint favouriteNumber1=5;
// bool favouriteBool = true;
// string favouriteString="abc";
// int256 favouriteInt=-5;
// address favouriteAddress= 0x7EF7E075edB1801578A0aedb749DdE3644D50D65;//eth a/c address
// bytes32 favouriteBytes="cat";//32 max bytes in string
uint256 favouriteNumber;//=0
// uint256 public favouriteNumber;//=0 to see fvrt number
//    uint256 favouriteNumber;//=0 to see fvrt number
function store(uint256 _favouriteNumber) public {
favouriteNumber=_favouriteNumber;
}
// view functions //getter
function retrieve() public view returns(uint256){
return favouriteNumber;
}
//view and pure are non-stage changing functions
// view- only read thats why they are blue//statereading//retrns
//pure to do maths //no returns //no state redaing
// function retrievepure(uint256 favouriteNumber) public pure {
//     favouriteNumber + favouriteNumber;
// }
// STRUCTS:WHAT IF WE WANT A GROUP OF PEOPLE AND STORE THEIR FVRT NUMBER
struct People{
uint256 favouriteNumber;
string name;
}
// People public person = People({favouriteNumber:2, name:"abc"});
// ..storing variables in solidity works in numberic index fashion
// to create whole list of People
// A R R A Y
People[] public people;//dynamic
// People[10] public people;//fixed
function addPerson(string memory _name, uint256 _favouriteNumber) public {
// people.push(People({favouriteNumber:_favouriteNumber, name:_name}));
people.push(People(_favouriteNumber,_name));
nameToFvrtNum[_name]=_favouriteNumber;
}
//to access array use index
//ways to store info in solidity:1-memory ,2-storage
// memory data will only be stored during execution of function /contract
//data will exist even after execution
//String is actuallt an array of bytes
//M A P P I N G S(dictionary)
//what if we looking for specific person
mapping(string => uint256) public nameToFvrtNum;
}
//deployin to a live network:mainnetor testnet
// we are using rinkby to deploy

INcomplete ;( gonna complete later.