Lesson 4: Web3.py Simple Storage - when I run "python deploy.py" I get a "SyntaxError: invalid syntax" message

[cyberflipped]

Hi there!

I've followed the steps detailed here:
https://github.com/PatrickAlphaC/web3_py_simple_storage

I set my private key and addressed the variables to connect with ganache and here's my deploy.py file:

import json

from web3 import Web3

# In the video, we forget to `install_solc`
# from solcx import compile_standard
from solcx import compile_standard, install_solc
import os
from dotenv import load_dotenv

load_dotenv()


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

# We add these two lines that we forgot from the video!
print("Installing...")
install_solc("0.6.0")

# Solidity source code
compiled_sol = compile_standard(
    {
        "language": "Solidity",
        "sources": {"SimpleStorage.sol": {"content": simple_storage_file}},
        "settings": {
            "outputSelection": {
                "*": {
                    "*": ["abi", "metadata", "evm.bytecode", "evm.bytecode.sourceMap"]
                }
            }
        },
    },
    solc_version="0.6.0",
)

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

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

# get abi
abi = json.loads(
    compiled_sol["contracts"]["SimpleStorage.sol"]["SimpleStorage"]["metadata"]
)["output"]["abi"]

# w3 = Web3(Web3.HTTPProvider(os.getenv("RINKEBY_RPC_URL")))
# chain_id = 4
#
# For connecting to ganache
w3 = Web3(Web3.HTTPProvider("http://0.0.0.0:8545"))
chain_id = 1337
my_address = "0x907c508f6bd46FE03630F03A768c2Eed34D0D0FD"
private_key = "0x82b605cec45cbbf9ff3f7deac74c18cfc63a999771e5cb61c2422290f8582f93"

# Create the contract in Python
SimpleStorage = w3.eth.contract(abi=abi, bytecode=bytecode)
# Get the latest transaction
nonce = w3.eth.getTransactionCount(my_address)
# Submit the transaction that deploys the contract
transaction = SimpleStorage.constructor().buildTransaction(
    {
        "chainId": chain_id,
        "gasPrice": w3.eth.gas_price,
        "from": my_address,
        "nonce": nonce,
    }
)
# Sign the transaction
signed_txn = w3.eth.account.sign_transaction(transaction, private_key=private_key)
print("Deploying Contract!")
# Send it!
tx_hash = w3.eth.send_raw_transaction(signed_txn.rawTransaction)
# Wait for the transaction to be mined, and get the transaction receipt
print("Waiting for transaction to finish...")
tx_receipt = w3.eth.wait_for_transaction_receipt(tx_hash)
print(f"Done! Contract deployed to {tx_receipt.contractAddress}")


# Working with deployed Contracts
simple_storage = w3.eth.contract(address=tx_receipt.contractAddress, abi=abi)
print(f"Initial Stored Value {simple_storage.functions.retrieve().call()}")
greeting_transaction = simple_storage.functions.store(15).buildTransaction(
    {
        "chainId": chain_id,
        "gasPrice": w3.eth.gas_price,
        "from": my_address,
        "nonce": nonce + 1,
    }
)
signed_greeting_txn = w3.eth.account.sign_transaction(
    greeting_transaction, private_key=private_key
)
tx_greeting_hash = w3.eth.send_raw_transaction(signed_greeting_txn.rawTransaction)
print("Updating stored Value...")
tx_receipt = w3.eth.wait_for_transaction_receipt(tx_greeting_hash)

print(simple_storage.functions.retrieve().call())

When I run python deploy.py, Visual Studio returns:

  File "deploy.py", line 80
    print(f"Done! Contract deployed to {tx_receipt.contractAddress}")
                                                                   ^
SyntaxError: invalid syntax

I would be very grateful for any assistance.

[PatrickAlphaC]

Could you try copy pasting from the github repo code? I don't see anything glaring...

[cromewar]

Yes, for me is something related to indentation error on for editor which is makin python to freak out.

[cyberflipped]

Thanks for the suggestions.

I've just tried this but to no avail. Here is the code:

deploy.py:

import json

from web3 import Web3

# In the video, we forget to `install_solc`
# from solcx import compile_standard
from solcx import compile_standard, install_solc
import os
from dotenv import load_dotenv

load_dotenv()


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

# We add these two lines that we forgot from the video!
print("Installing...")
install_solc("0.6.0")

# Solidity source code
compiled_sol = compile_standard(
    {
        "language": "Solidity",
        "sources": {"SimpleStorage.sol": {"content": simple_storage_file}},
        "settings": {
            "outputSelection": {
                "*": {
                    "*": ["abi", "metadata", "evm.bytecode", "evm.bytecode.sourceMap"]
                }
            }
        },
    },
    solc_version="0.6.0",
)

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

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

# get abi
abi = json.loads(
    compiled_sol["contracts"]["SimpleStorage.sol"]["SimpleStorage"]["metadata"]
)["output"]["abi"]

# w3 = Web3(Web3.HTTPProvider(os.getenv("RINKEBY_RPC_URL")))
# chain_id = 4
#
# For connecting to ganache
w3 = Web3(Web3.HTTPProvider("http://0.0.0.0:8545"))
chain_id = 1337
my_address = "0xaD0Fcc74E0DCC2284b26B4D3df36F101113889DF"
private_key = "0x49c66c8fac7563d0ed53d460cecf61a05bcb6e80c0255b449ea9d9cd8b3acabe"

# Create the contract in Python
SimpleStorage = w3.eth.contract(abi=abi, bytecode=bytecode)
# Get the latest transaction
nonce = w3.eth.getTransactionCount(my_address)
# Submit the transaction that deploys the contract
transaction = SimpleStorage.constructor().buildTransaction(
    {
        "chainId": chain_id,
        "gasPrice": w3.eth.gas_price,
        "from": my_address,
        "nonce": nonce,
    }
)
# Sign the transaction
signed_txn = w3.eth.account.sign_transaction(transaction, private_key=private_key)
print("Deploying Contract!")
# Send it!
tx_hash = w3.eth.send_raw_transaction(signed_txn.rawTransaction)
# Wait for the transaction to be mined, and get the transaction receipt
print("Waiting for transaction to finish...")
tx_receipt = w3.eth.wait_for_transaction_receipt(tx_hash)
print(f"Done! Contract deployed to {tx_receipt.contractAddress}")


# Working with deployed Contracts
simple_storage = w3.eth.contract(address=tx_receipt.contractAddress, abi=abi)
print(f"Initial Stored Value {simple_storage.functions.retrieve().call()}")
greeting_transaction = simple_storage.functions.store(15).buildTransaction(
    {
        "chainId": chain_id,
        "gasPrice": w3.eth.gas_price,
        "from": my_address,
        "nonce": nonce + 1,
    }
)
signed_greeting_txn = w3.eth.account.sign_transaction(
    greeting_transaction, private_key=private_key
)
tx_greeting_hash = w3.eth.send_raw_transaction(signed_greeting_txn.rawTransaction)
print("Updating stored Value...")
tx_receipt = w3.eth.wait_for_transaction_receipt(tx_greeting_hash)

print(simple_storage.functions.retrieve().call())

requirements.txt:

web3==5.23.1
py-solc-x

SimpleStorage.sol

// SPDX-License-Identifier: MIT

pragma solidity >=0.6.0 <0.9.0;

contract SimpleStorage {
    uint256 favoriteNumber;

    // This is a comment!
    struct People {
        uint256 favoriteNumber;
        string name;
    }

    People[] public people;
    mapping(string => uint256) public nameToFavoriteNumber;

    function store(uint256 _favoriteNumber) public {
        favoriteNumber = _favoriteNumber;
    }

    function retrieve() public view returns (uint256) {
        return favoriteNumber;
    }

    function addPerson(string memory _name, uint256 _favoriteNumber) public {
        people.push(People(_favoriteNumber, _name));
        nameToFavoriteNumber[_name] = _favoriteNumber;
    }
}

I'm using Python 3.9.6 and Visual Studio Code Version: 1.64.2 (Universal).

I saw these 2 problems and perhaps they might help to resolve the issue?

[cromewar]

Well two things here:

1. this line print(f"Done! Contract deployed to {tx_receipt.contractAddress}") seems to getting you some troubles, could you change it to print(tx_receipt.contractAddress) and see if this works for you?

This could for various reasons:

• you are not selecting the correct python interpreter on vscode (bottom left corner).
• you have installed the dependencies using something like pipx instead of pip.

[cyberflipped]

Thanks, however, now it suggests that line 85 has a syntax Error:

  File "deploy.py", line 85
    print(f"Initial Stored Value {simple_storage.functions.retrieve().call()}")
                                                                             ^
SyntaxError: invalid syntax

[cromewar]

For some reason is complaining in all print statements, which lead me to believe something is wrong with your python installation, could you try using a virtualenv and with python v 3.8?

[cyberflipped]

It would appear to me that there is an issue with Visual Studio Code for Mac:
"On macOS, selecting venv interpreter actually selects system interpreter #13603"
microsoft/vscode-python#13603

In the end, I installed "Python Environment Manager" v1.0.3 in Visual Studio Code
and then I had to chose the correct VirtualEnvWrapper:

I then needed to run:

pip install web3
pip install py-solc-x
pip install python-dotenv 
python deploy.py

It finally worked!

Installing...
Deploying Contract!
Waiting for transaction to finish...
Done! Contract deployed to 0x2DD458465bD26F3a8177336377677C6B93B29896
Initial Stored Value 0
Updating stored Value...
15

So the issue was indeed with VSC using the wrong version of python and it was thanks to the Python Environment Manager that I was finally able to get it to work

Many thanks for all your assistance.

[cromewar]

Nice it was definitely related to your python setup, I'm glad is solved now!