18-web3py

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Basic usage of web3.py

web3.py is a wrapped API based on the ethereum client API similar to web3.js. Familiarity with using it can give us a better understanding of programming on ethereum

Related tools

• Common IDE for python: PyCharm Visual Studio Code
• python version management tool: pyenv, you can use pyenv to install anaconda or other versions of python environment
• ganache-cli: Install through node, quickly build a local blockchain
• brownie: Installed as a python package, similar to truffle, it can be used to compile or generate projects more easily, in Here, just to demonstrate the interface of web3.py, its other functions are not used

Version dependencies

python: version 3.x and above env environment support todo

Install ganache-cli (If ganache-cli is already installed, skip this)

• Install using npm

npm install -g ganache-cli

install web3

pip3 install web3

Steps

• start ganache-cli

ganache-cli

• execute script

If the following command cannot be executed after installing Python 3 or above, use "python3" instead of "python"“
## Demonstrate contract construction and deployment
python scripts/1_deploy_using_web3.py

## Construct a contract instance based on the existing contract address
python scripts/2_play_around_on_existing_contract.py

## Demo of transfer using openzeppelin contract
python scripts/3_use_openzeppelin.py

## Demonstrate the call of the ERC20 contract
python scripts/4_use_openzeppelin_mintable_contract.py

## Demonstrate ERC20 dynamic Mint call
python scripts/5_use_openzeppelin_dynamic_mintable_contract.py

Reference link

https://web3py.readthedocs.io/en/stable/quickstart.html https://github.com/pypa/pipx