Package: veriteos-web3
# Web3.py[![Join the chat at https://gitter.im/ethereum/web3.py](https://badges.gitter.im/ethereum/web3.py.svg)](https://gitter.im/ethereum/web3.py?utm_source=badge&utm_medium=badge&utm_campaign=pr-badge&utm_content=badge)[![Build Status](https://circleci.com/gh/ethereum/web3.py.svg?style=shield)](https://circleci.com/gh/ethereum/web3.py.svg?style=shield)A Python implementation of [web3.js](https://github.com/ethereum/web3.js)* Python 3.5+ supportRead more in the [documentation on ReadTheDocs](http://web3py.readthedocs.io/). [View the change log on Github](docs/releases.rst).## Quickstart```pythonimport jsonimport web3from web3 import Web3, HTTPProvider, TestRPCProviderfrom solc import compile_sourcefrom web3.contract import ConciseContract# Solidity source codecontract_source_code = '''pragma solidity ^0.4.0;contract Greeter {string public greeting;function Greeter() {greeting = 'Hello';}function setGreeting(string _greeting) public {greeting = _greeting;}function greet() constant returns (string) {return greeting;}}'''compiled_sol = compile_source(contract_source_code) # Compiled source codecontract_interface = compiled_sol['<stdin>:Greeter']# web3.py instancew3 = Web3(TestRPCProvider())# Instantiate and deploy contractcontract = w3.eth.contract(abi=contract_interface['abi'], bytecode=contract_interface['bin'])# Get transaction hash from deployed contracttx_hash = contract.deploy(transaction={'from': w3.eth.accounts[0], 'gas': 410000})# Get tx receipt to get contract addresstx_receipt = w3.eth.getTransactionReceipt(tx_hash)contract_address = tx_receipt['contractAddress']# Contract instance in concise modeabi = contract_interface['abi']contract_instance = w3.eth.contract(address=contract_address, abi=abi,ContractFactoryClass=ConciseContract)# Getters + Setters for web3.eth.contract objectprint('Contract value: {}'.format(contract_instance.greet()))contract_instance.setGreeting('Nihao', transact={'from': w3.eth.accounts[0]})print('Setting value to: Nihao')print('Contract value: {}'.format(contract_instance.greet()))```## Developer Setup```shgit clone git@github.com:ethereum/web3.py.gitcd web3.py```Please see OS-specific instructions for:- [Linux](docs/README-linux.md#Developer-Setup)- [Mac](docs/README-osx.md#Developer-Setup)- [Windows](docs/README-windows.md#Developer-Setup)- [FreeBSD](docs/README-freebsd.md#Developer-Setup)Then run these install commands:```shvirtualenv venv. venv/bin/activatepip install -e .[dev]```For different environments, you can set up multiple `virtualenv`. For example, if you want to create a `venvdocs`, then you do the following:```shvirtualenv venvdocs. venvdocs/bin/activatepip install -e .[docs]pip install -e .```## Using DockerIf you would like to develop and test inside a Docker environment, use the *sandbox* container provided in the **docker-compose.yml** file.To start up the test environment, run:```docker-compose up -d```This will build a Docker container set up with an environment to run the Python test code.**Note: This container does not have `go-ethereum` installed, so you cannot run the go-ethereum test suite.**To run the Python tests from your local machine:```docker-compose exec sandbox bash -c 'pytest -n 4 -f -k "not goethereum"'```You can run arbitrary commands inside the Docker container by using the `bash -c` prefix.```docker-compose exec sandbox bash -c ''```Or, if you would like to just open a session to the container, run:```docker-compose exec sandbox bash```### Testing SetupDuring development, you might like to have tests run on every file save.Show flake8 errors on file change:```sh# Test flake8when-changed -v -s -r -1 web3/ tests/ ens/ -c "clear; flake8 web3 tests ens && echo 'flake8 success' || echo 'error'"```You can use `pytest-watch`, running one for every Python environment:```shpip install pytest-watchcd venvptw --onfail "notify-send -t 5000 'Test failure ⚠⚠⚠⚠⚠' 'python 3 test on web3.py failed'" ../tests ../web3```Or, you can run multi-process tests in one command, but without color:```sh# in the project root:pytest --numprocesses=4 --looponfail --maxfail=1# the same thing, succinctly:pytest -n 4 -f --maxfail=1```#### How to Execute the Tests?1. [Setup your development environment](https://github.com/ethereum/web3.py/#developer-setup).2. Execute `tox` for the testsThere are multiple [components](https://github.com/ethereum/web3.py/blob/master/.travis.yml#L53) of the tests. You can run test to against specific component. For example:```sh# Run Tests for the Core component (for Python 3.5):tox -e py35-core# Run Tests for the Core component (for Python 3.6):tox -e py36-core```If for some reason it is not working, add `--recreate` params.`tox` is good for testing against the full set of build targets. But if you want to run the tests individually, `py.test` is better for development workflow. For example, to run only the tests in one file:```shpy.test tests/core/gas-strategies/test_time_based_gas_price_strategy.py```### Release setupFor Debian-like systems:```apt install pandoc```To release a new version:```shmake release bump=$$VERSION_PART_TO_BUMP$$```#### How to bumpversionThe version format for this repo is `{major}.{minor}.{patch}` for stable, and`{major}.{minor}.{patch}-{stage}.{devnum}` for unstable (`stage` can be alpha or beta).To issue the next version in line, specify which part to bump,like `make release bump=minor` or `make release bump=devnum`.If you are in a beta version, `make release bump=stage` will switch to a stable.To issue an unstable version when the current version is stable, specify thenew version explicitly, like `make release bump="--new-version 4.0.0-alpha.1 devnum"`