Replacing Brett with Web3.py on Ethereum

As a developer working with the Ethereum blockchain, you are probably familiar with the Web3.py library for interacting with the Ethereum network. However, there are some issues that can arise when exchanging Brett tokens from one address to another. In this article, we will explore common issues and provide step-by-step solutions to resolve them.

Common Issues

Before we dive into the solution, let’s list some possible reasons why you might be having trouble exchanging Brett tokens:

• Invalid or missing addresses: Double-check that both addresses (ADRESA_DOPUSTE and ADRESA_BRETT) are valid and properly formatted.

• Invalid private key or gas limit

  : Make sure you are using a valid private key for thePERMIT_ADDRESSaddress, but do not exceed the maximum gas limit for the transaction.

Please ensure that you have a valid private key for thePERMIT_ADDRESS’ address. You can obtain this in the following ways:

• Retrieve the private key from the contract using the Web3.py eth_getRawTransaction function.

• Alternatively, use your preferred method to obtain the private key.

Step 2: Find the transaction details

To swap Brett tokens, you need to create a new transaction. You can do this by:

• Retrieving the current state of BRETT_ADDRESS.

• Creating a new contract instance using the Web3.py “Contract” class.

• Setting the parameters for the swap operation.

Step 3: Perform the exchange

Here is an example code snippet that demonstrates the exchange of Brett tokens:

web3 import





Set up constants and variables
PERMISSION_ADDRESS = '0x000000000022D473030F116dDEE9F6B43aC78BA3'
BRETT_ADDRESS = '...
contract address = '0x...'

Get the current Brett token balance
balance = web3.eth.getBalance(BRETT_ADDRESS)

Set the parameters for the exchange operation
parameters = [
{'from': PERMIT_ADDRESS, 'to': BRETT_ADDRESS, 'value': 10}, 
Exchange Brett tokens for 10 Brett units
]

Create a new transaction using the Web3.py Transaction class
tx = web3.eth.getTransaction(params[0], {"chainId": 1})

Sign the transaction with your private key (replace with your actual private key)
signedTx = tx.sign(privateKey)

Send the transaction to the Ethereum network
web3.eth.sendRawTransaction(signedTx.rawTransaction, {'gas': 40000, 'gasPrice': web3.toWei(20, 'gwei')})

Replace “privateKey” with your actual private key and set the gas limit according to your needs.

Step 4: Verify the exchange

To ensure the exchange was successful, you can do the following:

• Verify the Brett token balance on both addresses using Web3.py eth_getBalance.

• Verify that the transfer has been processed by checking the block number and transaction ID.

Price Vesting Polygon