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I have been using Web3.py, and Web3's TestRPCProvider to create some utility functions in Python to deploy a smart contract meant to generate an ERC20 Token, and then communicate with that smart contract to transfer funds. I would now like to try it on Infura's Ropsten test network. I created a wallet on the network using MyEtherWallet, and used web3 with the private/public keys of the wallet to build and sign the transaction necessary to deploy the ERC20 contract, however I am getting this error

ValueError: {'code': -32000, 'message': 'insufficient funds for gas * price + value'}

My question is this since it is a test network, is there a way to generate test Ropsten ether in my new wallet using Web3.py or MyEtherWallet? To me it seems a little more pointless to use a test network if you have to top up your account with real money anyway.

Code "As method of class"

def deploy(self):
    instance = self.w3.eth.contract(abi=self.abi, bytecode=self.bin)

    construct_txn = instance.constructor().buildTransaction({
        'from': self.pub,
        'value': 0,
        'gas': 100000,
        'gasPrice': w3.eth.gasPrice,
        'nonce': self.w3.eth.getTransactionCount(self.pub),
    })

    signed = self.acct.signTransaction(construct_txn)
    tx_hash = self.w3.eth.sendRawTransaction(signed.rawTransaction)
    print(tx_hash.hex())
  • It's not clear to me- are you testing it on Ropsten testnet using Infura or on your RPC client? If it's the Ropsten testnet, then there's already an answer by @aquila, if it's your local testnet, then please edit the question. – DaveIdito Oct 20 '18 at 10:26
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You can ask somebody to transfer ethers to your address or try to use faucets like https://faucet.metamask.io/ https://faucet.ropsten.be/

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