Web3.py
Project description
# Web3.py
[](https://gitter.im/pipermerriam/web3.py?utm_source=badge&utm_medium=badge&utm_campaign=pr-badge&utm_content=badge)
[](https://travis-ci.org/pipermerriam/web3.py)
[Documentation on ReadTheDocs](http://web3py.readthedocs.io/)
A python implementation of [web3.js](https://github.com/ethereum/web3.js)
* Python 2.7, 3.4, 3.5 support
## Installation
```sh
pip install web3
```
### Testing
For testing you can use the `TestRPCProvider`. This depends on
`eth-testrpc>=0.9.0` which must be eithe installed independently or with the
following installation command.
```sh
pip install web3[tester]
```
Then in your code:
```python
from web3 import Web3, TestRPCProvider
# Initialising a Web3 instance with an RPCProvider:
web3rpc = Web3(TestRPCProvider())
# or specifying host and port.
web3rpc = Web3(TestRPCProvider(host="127.0.0.1", port="8545"))
```
The `TestRPCProvider` uses an EVM backed by the `ethereum.tester` module from
the `pyethereum` package. This can be quite useful for testing your code which
uses `web3.py`.
### Setting defaults
```python
web3.eth.defaultAccount = <default from address>
web3.eth.defaultBlock = "latest"
# Can also be an integer or one of "latest", "pending", "earliest"
```
### Interacting with contracts
```python
>>> abi = json.joads("<abi-json-string>")
>>> ContractFactory = web3.eth.contract(abi, code="0x...")
>>> ContractFactory.deploy()
... '0x461e829a731d96539ec1f147232f1d52b475225ed343e5853ff6bf3b237c6e79'
>>> contract = web3.eth.contract(abi, address="0x...")
>>> contract.transact().someMethod()
... '0xfbb0f76aa6a6bb8d178bc2b54de8fc7ca778d704af47d135c188ca7b5d25f2e4'
>>> contract.call().return13()
... 13
>>> contract.estimateGas().someMethod()
... 23212
```
You can listen for events using the `on` and `pastEvents` functions on a
contract.
```python
def transfer_callback(log_entry):
... # do something with the log.
# create a filter and register a callback.
filter = MyContract.on("Transfer", {})
filter.watch(transfer_callback)
filter.stop_watching()
```
> The underlying asynchronous operations are managed by `gevent`.
### Timeouts, blocking and nonblocking requests
Web3.py does not currently support asynchronous calling patterns.
[](https://gitter.im/pipermerriam/web3.py?utm_source=badge&utm_medium=badge&utm_campaign=pr-badge&utm_content=badge)
[](https://travis-ci.org/pipermerriam/web3.py)
[Documentation on ReadTheDocs](http://web3py.readthedocs.io/)
A python implementation of [web3.js](https://github.com/ethereum/web3.js)
* Python 2.7, 3.4, 3.5 support
## Installation
```sh
pip install web3
```
### Testing
For testing you can use the `TestRPCProvider`. This depends on
`eth-testrpc>=0.9.0` which must be eithe installed independently or with the
following installation command.
```sh
pip install web3[tester]
```
Then in your code:
```python
from web3 import Web3, TestRPCProvider
# Initialising a Web3 instance with an RPCProvider:
web3rpc = Web3(TestRPCProvider())
# or specifying host and port.
web3rpc = Web3(TestRPCProvider(host="127.0.0.1", port="8545"))
```
The `TestRPCProvider` uses an EVM backed by the `ethereum.tester` module from
the `pyethereum` package. This can be quite useful for testing your code which
uses `web3.py`.
### Setting defaults
```python
web3.eth.defaultAccount = <default from address>
web3.eth.defaultBlock = "latest"
# Can also be an integer or one of "latest", "pending", "earliest"
```
### Interacting with contracts
```python
>>> abi = json.joads("<abi-json-string>")
>>> ContractFactory = web3.eth.contract(abi, code="0x...")
>>> ContractFactory.deploy()
... '0x461e829a731d96539ec1f147232f1d52b475225ed343e5853ff6bf3b237c6e79'
>>> contract = web3.eth.contract(abi, address="0x...")
>>> contract.transact().someMethod()
... '0xfbb0f76aa6a6bb8d178bc2b54de8fc7ca778d704af47d135c188ca7b5d25f2e4'
>>> contract.call().return13()
... 13
>>> contract.estimateGas().someMethod()
... 23212
```
You can listen for events using the `on` and `pastEvents` functions on a
contract.
```python
def transfer_callback(log_entry):
... # do something with the log.
# create a filter and register a callback.
filter = MyContract.on("Transfer", {})
filter.watch(transfer_callback)
filter.stop_watching()
```
> The underlying asynchronous operations are managed by `gevent`.
### Timeouts, blocking and nonblocking requests
Web3.py does not currently support asynchronous calling patterns.
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