Why is getTransactionReceipt returning None NoneType object

0 votes

I am using the following code:

provider = HTTPProvider('http://0.0.0.0:9945')
w3 = Web3(provider)

contract = w3.eth.contract(contract_interface['abi'], bytecode=contract_interface['bin'])

tx_hash = contract.deploy(transaction={'from': w3.eth.coinbase, 'gas': 250000})

print (tx_hash)
time.sleep(1)
tx_receipt = w3.eth.getTransactionReceipt(tx_hash)
print (tx_receipt)
contract_address = tx_receipt['contractAddress']

The tx_hash variable is getting a valid valid but tx_receipt is getting none.

The error I am getting is as follows:
contract_address = tx_receipt['contractAddress']
TypeError: 'NoneType' object is not subscriptable

w3.eth.getTransactionReceipt(tx_hash) function returns None

I dont understand why. Please help.

Jul 24, 2018 in Blockchain by digger
• 26,740 points
1,189 views

2 answers to this question.

0 votes
By looking at your code, it seems like the code "(w3.eth.getTransactionReceipt(tx_hash)" is getting executed before the block has been mined. According to the getTransactionReceipt doc http://web3py.readthedocs.io/en/latest/web3.eth.html#web3.eth.Eth.getTransactionReceipt),
getTransactionReceipt returns None when the transaction has not yet been mined. The sleep(1) is not giving enough time for the
blocks to be mined.

If you are using geth, start mining by turning on --mine or else try while w3.eth.getTransactionReceipt(tx_hash) is None
answered Jul 24, 2018 by slayer
• 29,370 points
0 votes

If you want to know more about this information. 

Visit: typeerror nonetype object is not subscriptable

answered Sep 11, 2020 by pythoncourse
• 140 points

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