Lesson 4: unable to execute print(transaction)

[ti51120]

Can anyone help with the error below? It works perfectly fine until I try to execute the print(transaction).

Below is my code.

from solcx import compile_standard, install_solc
import json
from web3 import Web3

with open("./SimpleStorage.sol", "r") as file:
    simpel_storage_file = file.read()

# Compile solidity
install_solc("0.6.0")
compiled_sol = compile_standard(
    {
        "language": "Solidity",
        "sources": {"SimpleStorage.sol": {"content": simpel_storage_file}},
        "settings": {
            "outputSelection": {
                "*": {"*": ["abi", "metadata", "evm.bytecode", "evm.sourceMap"]}
            }
        },
    }
)

with open("compiled_code.json", "w") as file:
    json.dump(compiled_sol, file)

bytecode = compiled_sol["contracts"]["SimpleStorage.sol"]["SimpleStorage"]["evm"][
    "bytecode"
]["object"]

abi = compiled_sol["contracts"]["SimpleStorage.sol"]["SimpleStorage"]["abi"]

#  Connecting to ganache
w3 = Web3(Web3.HTTPProvider("HTTP://127.0.0.1:7545"))
chain_id = 1337
my_address = "0x27e0A545B03bFE673f036C108df49465e68D6F65"
private_key = "0x15530a613dd53507c305eeba6f5e0995bf356d6fbbd0a9a7e882357163f20c6d"

# Create the contract in Python
SimpleStorage = w3.eth.contract(abi=abi, bytecode=bytecode)
nonce = w3.eth.getTransactionCount(my_address)

transaction = SimpleStorage.constructor().buildTransaction(
    {"chainId": chain_id, "from": my_address, "nonce": nonce}
)

print(transaction)

[cromewar]

Hello @ti51120 that's strange, let me understand the error just show up when adding the printing statement? I read the error and the maxPriorityFeeGas is usually related with Alchemy. @PatrickAlphaC could you give us a hand on this one?

[PatrickAlphaC]

Nice work :)

[Zetazero25]

I am running into the same issue as discussed in this thread. It seems that you are suggesting i change which version of web3 i have installed. How do i know which version of web3 is installed? and if the wrong version is installed how do i install the correct version?

[cromewar]

Hello @Zetazero25 you can see the web3 versions here.
If you want to install a specific version of a package on python using pip just do this: pip install package==version.

[PatrickAlphaC]

https://stackoverflow.com/questions/70104101/valueerror-method-eth-maxpriorityfeepergas-not-supported-web3-py-with-ganache

[Zetazero25]

Thank You! you guys are amazing

[yujiosword]

For visability, the answer can be found here: https://stackoverflow.com/questions/70104101/valueerror-method-eth-maxpriorityfeepergas-not-supported-web3-py-with-ganache

Encountered same error before, and it can be resolved by adding one more argument when building a transaction

transaction = SimpleStorage.constructor().buildTransaction(
    {
        "gasPrice": w3.eth.gas_price,
        "chainId": chain_id,
        "from": my_address,
        "nonce": nonce,
    }
)

[cromewar]

You are awesome @yujiosword .