Code for How to Query the Ethereum Blockchain with Python Tutorial

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query_ethereum_blockchain.py

from web3 import Web3 # infura API key API_KEY = "put your API key here" # change endpoint to mainnet or ropsten or any other of your account url = f"https://<endpoint>.infura.io/v3/{API_KEY}" w3 = Web3(Web3.HTTPProvider(url)) # see whether the connection is established res = w3.isConnected() print(res) # get latest block latest = w3.eth.get_block('latest') print(latest) # print the block number print(latest['number']) # query individual transactions transaction1 = w3.eth.get_transaction('0x0e3d45ec3e1d145842ce5bc56ad168e4a98508e0429da96c1ff89f11076da36d') print(transaction1) # use block number to query transactions transaction2 = w3.eth.get_transaction_by_block(15410924, 0) print(transaction2) # get number of transactions in a block transactionCount = w3.eth.get_transaction_count('0x486976656f6e2065752d68656176792d657163') print(transactionCount) # check if a block address is valid isValid = w3.isAddress('0xed44e77fb3408cd5ad415d7467af6f6783218fb74c3824de1258f6d266bcc7b7') print(isValid) # check if an address is a valid EIP-55 checksum address isChecksumAddressValid = Web3.isChecksumAddress('0x486976656f6e2065752d68656176792d657163') print(isChecksumAddressValid) # get balance of a block address balance = w3.eth.get_balance('0xd3CdA913deB6f67967B99D67aCDFa1712C293601') print(balance) # get proof of a block proof = w3.eth.get_proof('0x486976656f6e2065752d68656176792d657163', [0], 3391) print(proof) # get uncle of a block w3.eth.get_uncle_by_block(15410924, 0) nonce = w3.eth.getTransactionCount('0x610Ae88399fc1687FA7530Aac28eC2539c7d6d63', 'latest') # create a transaction transaction = { 'to': '0x31B98D14007bDEe637298086988A0bBd31184523', 'from': '0x31B98D14007bDEe63EREEDFT34544646MOI22', 'value': 500, 'gas': 10000, 'maxFeePerGas': 1000000208, 'nonce': nonce, } # send the transaction w3.eth.send_transaction(transaction) # sign a transaction signed = w3.eth.sign_transaction( dict( nonce=nonce, maxFeePerGas=34300000, maxPriorityFeePerGas=25000000, gas=100000, to='0xerecfBYWlB99D67aCDFa17EREFEerrtr73601', value=1, data=b'', ) ) address = '0x706f6f6c696e2e636f6d21688947c8f76c4e92' abi = '[{"inputs":[{"internalType":"address","name":"account","type":"address"},{"internalType":"address","name":"minter_",........' # abi of the contract # create a contract object contract = w3.eth.contract(address=address, abi=abi) # total supply of the token totalSupply = contract.functions.totalSupply().call() print(totalSupply) # read the data and update the state contract.functions.storedvalue().call() tx_hash = contract.functions.updateValue(100).transact() # retrieve token metadata print(contract.functions.name().call()) print(contract.functions.decimals().call()) print(contract.functions.symbol().call()) # output: # SHIBACHU # 9 # SHIBACHU # find the account balance address = '0x5eaaf114aad1313e7440d2ff805ced993e566df' balance = contract.functions.balanceOf(address).call()