deploy contract example is broken ! "Expected an int, bytes, bytearray or hexstr."

[drandreaskrueger]

Your own example has stopped working?

versions: web3 4.2.0, solc 0.4.23+commit.124ca40d.Linux.gpp, eth_tester 0.1.0b24, python 3.5.3 (default, Jan 19 2017, 14:11:04) [GCC 6.3.0 20170118]

~/py3/site-packages/eth_tester/backends/__init__.py:48: UserWarning: Ethereum Tester: No backend was explicitely set, and no *full* backends were available.  Falling back to the `MockBackend` which does not support all EVM functionality.  Please refer to the `eth-tester` documentation for information on what backends are available and how to set them.
  "Ethereum Tester: No backend was explicitely set, and no *full* "
~/DeployContractExample.py:20: DeprecationWarning: deploy is deprecated in favor of contract.constructor.transact
  bytecode=contract_interface['bin']).deploy()

Traceback (most recent call last):
  File "~/DeployContractExample.py", line 41, in <module>
    address = deploy_contract(w3, contract_interface)
  File "~/DeployContractExample.py", line 20, in deploy_contract
    bytecode=contract_interface['bin']).deploy()
  File "~/py3/site-packages/web3/utils/decorators.py", line 57, in wrapper
    return to_wrap(*args, **kwargs)
  File "~/py3/site-packages/web3/contract.py", line 289, in deploy
    deploy_transaction['data'] = cls._encode_constructor_data(args, kwargs)
  File "~/py3/site-packages/web3/utils/decorators.py", line 16, in _wrapper
    return self.method(objtype, *args, **kwargs)
  File "~/py3/site-packages/web3/contract.py", line 667, in _encode_constructor_data
    arguments = merge_args_and_kwargs(constructor_abi, args, kwargs)
  File "~/py3/site-packages/web3/utils/abi.py", line 204, in merge_args_and_kwargs
    len(args) + len(kwargs),

TypeError: Incorrect argument count.  Expected '1'.  Got '0'

What was wrong?

Please see

• DeployContractExample.py
• tested both contracts in contract.sol, both fail with the same error message.

How can it be fixed?

Repair example code.

[drandreaskrueger]

Actually, now I chose to deploy not their, but your example contract.sol ... and now I get a different error:

versions: web3 4.2.0, solc 0.4.23+commit.124ca40d.Linux.gpp, eth_tester 0.1.0b24, python 3.5.3 (default, Jan 19 2017, 14:11:04) [GCC 6.3.0 20170118]
~/py3/site-packages/eth_tester/backends/__init__.py:48: UserWarning: Ethereum Tester: No backend was explicitely set, and no *full* backends were available.  Falling back to the `MockBackend` which does not support all EVM functionality.  Please refer to the `eth-tester` documentation for information on what backends are available and how to set them.
  "Ethereum Tester: No backend was explicitely set, and no *full* "
~/DeployContractExample.py:25: DeprecationWarning: deploy is deprecated in favor of contract.constructor.transact
  bytecode=contract_interface['bin']).deploy()
Traceback (most recent call last):
  File "~/DeployContractExample.py", line 46, in <module>
    address = deploy_contract(w3, contract_interface)
  File "~/DeployContractExample.py", line 25, in deploy_contract
    bytecode=contract_interface['bin']).deploy()
  File "~/py3/site-packages/web3/utils/decorators.py", line 57, in wrapper
    return to_wrap(*args, **kwargs)
  File "~/py3/site-packages/web3/contract.py", line 291, in deploy
    txn_hash = cls.web3.eth.sendTransaction(deploy_transaction)
  File "~/py3/site-packages/web3/eth.py", line 239, in sendTransaction
    get_buffered_gas_estimate(self.web3, transaction),
  File "~/py3/site-packages/web3/utils/transactions.py", line 72, in get_buffered_gas_estimate
    gas_estimate = web3.eth.estimateGas(gas_estimate_transaction)
  File "~/py3/site-packages/web3/eth.py", line 280, in estimateGas
    [transaction],
  File "~/py3/site-packages/web3/manager.py", line 106, in request_blocking
    raise ValueError(response["error"])

ValueError: RPC Endpoint has not been implemented: eth_estimateGas

[drandreaskrueger]

I guess that's it? Wrong versions?

-->

http://web3py.readthedocs.io/en/latest/contracts.html#contract-deployment-example

[drandreaskrueger]

but

The sandbox node provided by eth-tester. You can install it with pip install -U web3[tester].

in spite of

pip3 install py-solc web3 web3[tester]

I get a

versions: web3 4.2.0, solc 0.4.23+commit.124ca40d.Linux.gpp, python 3.5.3 (default, Jan 19 2017, 14:11:04) [GCC 6.3.0 20170118]
Traceback (most recent call last):
  File "/home/akrueger/Documents/Code/gitlab/electronDLT/chainhammer/DeployContractExample.py", line 42, in <module>
    w3 = Web3(Web3.EthereumTesterProvider())
  File "/home/akrueger/Documents/Code/envs/py3eth/lib/python3.5/site-packages/web3/utils/decorators.py", line 57, in wrapper
    return to_wrap(*args, **kwargs)
  File "/home/akrueger/Documents/Code/envs/py3eth/lib/python3.5/site-packages/web3/providers/tester.py", line 121, in __init__
    raise Exception("`TestRPCProvider` requires the `eth-testrpc` package to be installed")
Exception: `TestRPCProvider` requires the `eth-testrpc` package to be installed

[drandreaskrueger]

So ... now ... with pip3 install py-solc web3 web3[tester] eth-testrpc

This code, which is the exact copy of your example in the latest manual
https://gitlab.com/electronDLT/chainhammer/blob/1c87749345d04a474b243e7b3ccd97a8dc3358e3/DeployContractExample.py

does still fail:

versions: web3 4.2.0, solc 0.4.23+commit.124ca40d.Linux.gpp, python 3.5.3 (default, Jan 19 2017, 14:11:04) [GCC 6.3.0 20170118]

Traceback (most recent call last):
  File "~/DeployContractExample.py", line 45, in <module>
    print (w3.eth.accounts)
  File "~/py3/site-packages/web3/eth.py", line 97, in accounts
    return self.web3.manager.request_blocking("eth_accounts", [])
  File "~/py3/site-packages/web3/manager.py", line 103, in request_blocking
    response = self._make_request(method, params)
  File "~/py3/site-packages/web3/manager.py", line 86, in _make_request
    return request_func(method, params)
  File "~/py3/site-packages/web3/middleware/gas_price_strategy.py", line 18, in middleware
    return make_request(method, params)
  File "~/py3/site-packages/web3/middleware/formatting.py", line 23, in middleware
    response = make_request(method, params)
  File "~/py3/site-packages/web3/middleware/attrdict.py", line 18, in middleware
    response = make_request(method, params)
  File "~/py3/site-packages/web3/middleware/formatting.py", line 23, in middleware
    response = make_request(method, params)
  File "~/py3/site-packages/web3/middleware/normalize_errors.py", line 9, in middleware
    result = make_request(method, params)
  File "~/py3/site-packages/web3/middleware/validation.py", line 45, in middleware
    return make_request(method, params)
  File "~/py3/site-packages/web3/middleware/formatting.py", line 23, in middleware
    response = make_request(method, params)
  File "~/py3/site-packages/web3/middleware/formatting.py", line 23, in middleware
    response = make_request(method, params)
  File "~/py3/site-packages/web3/providers/tester.py", line 67, in middleware
    return valmap(to_text, make_request(method, params))
  File "cytoolz/dicttoolz.pyx", line 165, in cytoolz.dicttoolz.valmap
  File "cytoolz/dicttoolz.pyx", line 190, in cytoolz.dicttoolz.valmap
  File "~/py3/site-packages/eth_utils/decorators.py", line 73, in wrapper
    return to_wrap(*args, **kwargs)
  File "~/py3/site-packages/eth_utils/conversions.py", line 115, in to_text
    raise TypeError("Expected an int, bytes, bytearray or hexstr.")

TypeError: Expected an int, bytes, bytearray or hexstr.

[drandreaskrueger]

Your

@validate_conversion_arguments
def to_text(primitive=None, hexstr=None, text=None):
    if hexstr is not None:
        return to_bytes(hexstr=hexstr).decode('utf-8')
    elif text is not None:
        return text
    elif isinstance(primitive, str):
        return to_text(hexstr=primitive)
    elif isinstance(primitive, (bytes, bytearray)):
        return primitive.decode('utf-8')
    elif is_integer(primitive):
        byte_encoding = int_to_big_endian(primitive)
        return to_text(byte_encoding)
    print (type(primitive))  #################
    print (type(primitive[0]))  ###############
    raise TypeError("Expected an int, bytes, bytearray or hexstr.")

is incomplete? Or what is wrong there?

Those print commands give me:

<class 'list'>
<class 'bytes'>

for a

print (w3.eth.accounts)

call.

---

should I perhaps NOT use the latest version of Web3.py?

http://web3py.readthedocs.io/en/latest/releases.html says last stable is 4.0.0
do you still trust that version?

Please give me a link to the manual of a trustworthy library, and the corresponding pip install command, to get that exact library - thanks a lot!

Or if the above problem comes from the wrong combination of tools, then please tell me the exact pip install web3==4.0.0 solc==... etc command to get YOUR exact versions installed; those which let your example code not fail but go through; plus name the manual which fits. Thx.

[drandreaskrueger]

I have now also tried pip3 install web3[tester]==4.0.0, and deleted the w3.eth.defaultAccount = w3.eth.accounts[0] but then it runs into the exact same problem at tx_hash = Greeter.constructor().transact() --> TypeError: Expected an int, bytes, bytearray or hexstr.

Web3.py is broken.

[drandreaskrueger]

In short:

Please update your latest contracts.html#contract-deployment-example into something that actually works with your latest code, and don't forget to give the exact dependency versioning:

pip3 install web3[tester]==4.0.0 py-solc==x.y.z web3==x.y.z eth-testrpc==x.y.z

Thanks a lot!

[dangell7]

@drandreaskrueger

change the line

w3 = Web3(Web3.EthereumTesterProvider())

to

w3 = Web3(Web3.TestRPCProvider())

This will fix your problem.

[dangell7]

Also, @drandreaskrueger fyi

pip install web3
pip install py-solc
pip install eth-testrpc
pip install rlp==0.6.0

[carver]

There is a bug that is fixed in master (and the latest docs), that is not released yet. The bug is that:

from web3 import Web3, EthereumTesterProvider
assert Web3.EthereumTesterProvider == EthereumTesterProvider, "this is failing in the 4.* releases, but will be fixed in the next one"

Until the next release, you can use the contract example, but you would have to initialize w3 with:

from web3 import Web3, EthereumTesterProvider
w3 = Web3(EthereumTesterProvider())

[drandreaskrueger]

Fantastic, thanks a lot, @dangell7 and @carver

This version is now working perfectly.

Thanks!

[drandreaskrueger]

Is there an easy way to link to a matching version v4.2.0 of the readthedocs

https://web3py.readthedocs.io/en/v4.2.0/

instead of linking to

http://web3py.readthedocs.io/en/latest/contracts.html#contract-deployment-example

because latest will be a moving target ;-)

---

To prevent such problems in the future, I have now fixed all pip install ... versions like this.