2

I am new to Ethereum. Using pywallet, In my project, I had make ethereum wallet in local. Infura API is used as a provider for me.

https://mainnet.infura.io/MYTOKEN

So I get balance of address generated by my wallet using web3.py. And I want to send ether to some recipient(address). But I can't make transaction and can't find docs about that. Help me.

EDITED ADD QUESTIONS What is the default gasprice? How to determine gasprice and gas amount? Thanks.

3

This is described in web3py Documentation

Once you have your provider set and web3 instantiates you can do:

signed_txn = w3.eth.account.signTransaction(dict(
    nonce=w3.eth.getTransactionCount('yourAddress'),
    gasPrice = w3.eth.gasPrice, 
    gas = 100000,
    to='recipientAddress',
    value=web3.toWei(12345,'ether')
  ),
  'yourprivatekey')

w3.eth.sendRawTransaction(signed_txn.rawTransaction)

It will give the hash of the transaction. If you have your keyfile but you do not know your privatekey you can get it using this tool included in web3py

with open('path to your keyfile') as keyfile:
    encrypted_key = keyfile.read()
    private_key = w3.eth.account.decrypt(encrypted_key, 'thepasswordforyour_keyfile')

Hope this helps.

  • Thanks! where do we get the txid? – c2h2 Jun 1 '18 at 9:12
  • the transactionhash is returned when you do w3.eth.sendRawTransaction(signed_txn.rawTransaction), so you can do this: txid = w3.eth.sendRawTransaction(signed_txn.rawTransaction) – Jaime Jun 1 '18 at 9:14
  • Thanks again, but I am getting error message (on rinkeby): ValueError: {'code': -32000, 'message': 'insufficient funds for gas * price + value'} the account has 18.75 ETH, private key is 32 digits hex from Metamask... is it ok? – c2h2 Jun 1 '18 at 9:20
  • I got it working, 12345 is too large,,, I thought it is a wei. Thanks a lot! – c2h2 Jun 1 '18 at 9:30
  • If this solved your question, please accept the answer clicking on the check mark – Jaime Jun 1 '18 at 9:43

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