Web3QueryContractPython

Example of how to dynamically query read/write functions for a given Smart Contract using just the contract address (no ABI necessary) using Web3 in Python. Will dynamically retrieve the contract's ABI through etherscan's API.

1. Create Python virtual environment (optional)
   python -m venv venv
source venv/bin/activate

2. Install web3.py
   pip install web3

3. Add your Ethereum endpoint URL using Infura or equivalent
   This is required to query the Ethereum blockchain
   infura_url = "https://mainnet.infura.io/v3/00000000000000000000000"

4. Add the address of the Smart Contract you want to query
   You can get this from etherscan.io
   address = web3.toChecksumAddress("0x00000000000000000000000")

5. run web3QueryContract.py
   python3 web3QueryContract.py

Output should be similar to this:

READ CONTRACT FUNCTIONS:
contractURI: https://nft.syn.city/meta/SYNP/
maxTokenId: 888
name: Syn City Genesis Passes
nextTokenId: 409
owner: 0x41BDD852d3618Dc5D6338279F373Bf7935dc0242
symbol: SYNP
tokenURIHasBeenFrozen: False
validator: 0xc626be886d4b7D09898152c61959A9a898a78D6f

WRITE CONTRACT FUNCTIONS
approve
claimFreeToken
encodeForSignature
freezeBaseTokenURI
giveawayToken
renounceOwnership
revokeOperator
safeTransferFrom
safeTransferFrom
setApprovalForAll
setOperators
setValidator
transferFrom
transferOwnership
updateBaseTokenURI

There are also some examples of how to call individual functions directly using Web3's call() function (commented out by default).

Questions?
benwhut@gmail.com