Web3.py
Project description
# Web3.py
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A python implementation of [web3.js](https://github.com/ethereum/web3.js)
## Goals
* Python 2.7, 3.4, 3.5 support
* Provide a feature-for-feature python implementation of Web3.js
## Installation
```sh
pip install web3
```
## API
This documentation is not yet complete, although the API should offer most functionality described in the [Javascript API documentation](https://github.com/ethereum/wiki/wiki/JavaScript-API), except for contract events and filters.
### Initialisation
Initialising the Ethereum node
```sh
# IPC
geth --unlock 0 console
# RPC, if required, with --rpcaddr "localhost" --rpcport <port>
geth --rpc --unlock 0 console
```
Connecting to the Ethereum node
```python
from web3 import Web3, RPCProvider, IPCProvider
# Initialising a Web3 instance with an RPCProvider:
web3rpc = Web3(RPCProvider(host="127.0.0.1", port="8545"))
# Initialising a Web3 instance with an IPCProvider:
web3ipc = Web3(IPCProvider(ipcpath=None, testnet=False))
# Both arguments can be omitted, the ipcpath should be found automatically
```
### Testing
For testing you can use the `TestRPCProvider`. This depends on
`eth-testrpc>=0.2.0` which must be installed independently (It is not included
as a hard dependency for this package.)
```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.config.defaultAccount = <your (unlocked) account>
web3.config.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.
### `web3`
#### web3.db.*
Available as described in the [Javascript API documentation](https://github.com/ethereum/wiki/wiki/JavaScript-API).
#### web3.eth.*,
Available as described in the [Javascript API documentation](https://github.com/ethereum/wiki/wiki/JavaScript-API).
#### web3.net.*
Available as described in the [Javascript API documentation](https://github.com/ethereum/wiki/wiki/JavaScript-API).
#### web3.personal.*
Available as described in the [Javascript API documentation](https://github.com/ethereum/wiki/wiki/JavaScript-API).
#### web3.ssh.*
Available as described in the [Javascript API documentation](https://github.com/ethereum/wiki/wiki/JavaScript-API).
##### `web3.sha3`
```python
>>> web3.sha3(b'some text')
'46ba1b442d3606a3437800ee7ae5a0249756405e676739b46aa8f6e85b13fe2b'
>>> web3.sha3('0x80', encoding='hex')
'56e81f171bcc55a6ff8345e692c0f86e5b48e01b996cadc001622fb5e363b421'
```
#### `web3.eth`
##### `web3.eth.iban`
```python
>>> web3.eth.iban("XE81ETHXREGGAVOFYORK")
<web3.eth.iban.Iban at 0x107301dd8>
```
###### `web3.eth.iban.fromAddress`
```python
>>> web3.eth.iban.fromAddress('0x00c5496aee77c1ba1f0854206a26dda82a81d6d8').toString()
'XE7338O073KYGTWWZN0F2WZ0R8PX5ZPPZS'
```
###### `web3.eth.iban.fromBban`
```python
>>> web3.eth.iban.fromBban('ETHXREGGAVOFYORK').toString()
'XE81ETHXREGGAVOFYORK'
```
###### `web3.eth.iban.createIndirect`
```python
>>> web3.eth.iban.createIndirect({
... 'institution': "XREG",
... 'identifier': "GAVOFYORK"
... }).toString()
'XE81ETHXREGGAVOFYORK'
```
###### `web3.eth.iban.isValid`
```python
>>> web3.eth.iban.isValid("XE81ETHXREGGAVOFYORK")
True
>>> web3.eth.iban.isValid("XE82ETHXREGGAVOFYORK")
False # false, cause checksum is incorrect
web3.eth.iban("XE81ETHXREGGAVOFYORK").isValid()
True
```
###### `web3.eth.iban.isDirect`
```python
>>> web3.eth.iban("XE81ETHXREGGAVOFYORK").isDirect()
False
```
###### `web3.eth.iban.isIndirect`
```python
>>> web3.eth.iban("XE81ETHXREGGAVOFYORK").isIndirect()
True
```
###### `web3.eth.iban.checksum`
```python
>>> web3.eth.iban("XE81ETHXREGGAVOFYORK").checksum()
'81'
```
###### `web3.eth.iban.institution`
```python
>>> web3.eth.iban("XE81ETHXREGGAVOFYORK").institution()
'XREG'
```
###### `web3.eth.iban.client`
```python
>>> web3.eth.iban("XE81ETHXREGGAVOFYORK").client()
'GAVOFYORK'
```
###### `web3.eth.iban.address`
```python
>>> web3.eth.iban('XE7338O073KYGTWWZN0F2WZ0R8PX5ZPPZS').address()
'00c5496aee77c1ba1f0854206a26dda82a81d6d8'
```
###### `web3.eth.iban.toString`
```python
>>> web3.eth.iban('XE7338O073KYGTWWZN0F2WZ0R8PX5ZPPZS').toString()
'XE7338O073KYGTWWZN0F2WZ0R8PX5ZPPZS'
```
[](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)
[](https://readthedocs.org/projects/web3.py/?badge=latest)
[](https://pypi-hypernode.com/pypi/web3.py)
[](https://pypi-hypernode.com/pypi/web3.py)
A python implementation of [web3.js](https://github.com/ethereum/web3.js)
## Goals
* Python 2.7, 3.4, 3.5 support
* Provide a feature-for-feature python implementation of Web3.js
## Installation
```sh
pip install web3
```
## API
This documentation is not yet complete, although the API should offer most functionality described in the [Javascript API documentation](https://github.com/ethereum/wiki/wiki/JavaScript-API), except for contract events and filters.
### Initialisation
Initialising the Ethereum node
```sh
# IPC
geth --unlock 0 console
# RPC, if required, with --rpcaddr "localhost" --rpcport <port>
geth --rpc --unlock 0 console
```
Connecting to the Ethereum node
```python
from web3 import Web3, RPCProvider, IPCProvider
# Initialising a Web3 instance with an RPCProvider:
web3rpc = Web3(RPCProvider(host="127.0.0.1", port="8545"))
# Initialising a Web3 instance with an IPCProvider:
web3ipc = Web3(IPCProvider(ipcpath=None, testnet=False))
# Both arguments can be omitted, the ipcpath should be found automatically
```
### Testing
For testing you can use the `TestRPCProvider`. This depends on
`eth-testrpc>=0.2.0` which must be installed independently (It is not included
as a hard dependency for this package.)
```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.config.defaultAccount = <your (unlocked) account>
web3.config.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.
### `web3`
#### web3.db.*
Available as described in the [Javascript API documentation](https://github.com/ethereum/wiki/wiki/JavaScript-API).
#### web3.eth.*,
Available as described in the [Javascript API documentation](https://github.com/ethereum/wiki/wiki/JavaScript-API).
#### web3.net.*
Available as described in the [Javascript API documentation](https://github.com/ethereum/wiki/wiki/JavaScript-API).
#### web3.personal.*
Available as described in the [Javascript API documentation](https://github.com/ethereum/wiki/wiki/JavaScript-API).
#### web3.ssh.*
Available as described in the [Javascript API documentation](https://github.com/ethereum/wiki/wiki/JavaScript-API).
##### `web3.sha3`
```python
>>> web3.sha3(b'some text')
'46ba1b442d3606a3437800ee7ae5a0249756405e676739b46aa8f6e85b13fe2b'
>>> web3.sha3('0x80', encoding='hex')
'56e81f171bcc55a6ff8345e692c0f86e5b48e01b996cadc001622fb5e363b421'
```
#### `web3.eth`
##### `web3.eth.iban`
```python
>>> web3.eth.iban("XE81ETHXREGGAVOFYORK")
<web3.eth.iban.Iban at 0x107301dd8>
```
###### `web3.eth.iban.fromAddress`
```python
>>> web3.eth.iban.fromAddress('0x00c5496aee77c1ba1f0854206a26dda82a81d6d8').toString()
'XE7338O073KYGTWWZN0F2WZ0R8PX5ZPPZS'
```
###### `web3.eth.iban.fromBban`
```python
>>> web3.eth.iban.fromBban('ETHXREGGAVOFYORK').toString()
'XE81ETHXREGGAVOFYORK'
```
###### `web3.eth.iban.createIndirect`
```python
>>> web3.eth.iban.createIndirect({
... 'institution': "XREG",
... 'identifier': "GAVOFYORK"
... }).toString()
'XE81ETHXREGGAVOFYORK'
```
###### `web3.eth.iban.isValid`
```python
>>> web3.eth.iban.isValid("XE81ETHXREGGAVOFYORK")
True
>>> web3.eth.iban.isValid("XE82ETHXREGGAVOFYORK")
False # false, cause checksum is incorrect
web3.eth.iban("XE81ETHXREGGAVOFYORK").isValid()
True
```
###### `web3.eth.iban.isDirect`
```python
>>> web3.eth.iban("XE81ETHXREGGAVOFYORK").isDirect()
False
```
###### `web3.eth.iban.isIndirect`
```python
>>> web3.eth.iban("XE81ETHXREGGAVOFYORK").isIndirect()
True
```
###### `web3.eth.iban.checksum`
```python
>>> web3.eth.iban("XE81ETHXREGGAVOFYORK").checksum()
'81'
```
###### `web3.eth.iban.institution`
```python
>>> web3.eth.iban("XE81ETHXREGGAVOFYORK").institution()
'XREG'
```
###### `web3.eth.iban.client`
```python
>>> web3.eth.iban("XE81ETHXREGGAVOFYORK").client()
'GAVOFYORK'
```
###### `web3.eth.iban.address`
```python
>>> web3.eth.iban('XE7338O073KYGTWWZN0F2WZ0R8PX5ZPPZS').address()
'00c5496aee77c1ba1f0854206a26dda82a81d6d8'
```
###### `web3.eth.iban.toString`
```python
>>> web3.eth.iban('XE7338O073KYGTWWZN0F2WZ0R8PX5ZPPZS').toString()
'XE7338O073KYGTWWZN0F2WZ0R8PX5ZPPZS'
```
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