# Ethereum Contract
[](https://circleci.com/gh/ethereum/eth-abi) [](https://readthedocs.org/projects/eth-abi/?badge=latest) [](https://pypi.python.org/pypi/eth-abi)
Python utilities for working with the Ethereum ABI
## Installation
`sh pip install eth-abi `
## Documentation
### Decoding
These functions are intended for decoding return values from the EVM.
eth_abi.decode_single(type, data)
This function tries to decode data into the python type that corresponds to the provided type. This function accepts data of type bytes.
>>> decode_single('uint256', b'\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x0009')
12345
The value parameter is expected to be one of the recognized EVM types.
eth_abi.decode_abi(types, data)
This function decodes data into the python type corresponding to the provided types. This function accepts arrays of type byte.
>>> decode_abi(['uint256'], b'\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x0009')
[12345]
>>> decode_abi(['bytes32', 'bytes32'], b'a\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00b\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00')
['a', 'b']
The values parameter is expected to be an iterable whose values are all one of the recognized EVM types.
### Encoding
These functions are intended for encoding python values into representations that are suitable for interacting with the EVM.
eth_abi.encode_single(type, value)
This function encodes value in the ABI encoding for the provided type.
>>> encode_single('uint256', 12345)
b'\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x0009'
The value parameter is expected to be one of the recognized EVM types.
eth_abi.encode_abi(types, values)
This function encodes values in the ABI encoding for the corresponding type provided by the types argument.
>>> encode_abi(['uint256'], [12345])
b'\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x0009'
>>> encode_abi(['bytes32', 'bytes32'], ['a', 'b'])
b'a\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00b\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00'
The values parameter is expected to be an iterable whose values are all one of the recognized EVM types.
## Development
Clone the repository and then run:
`sh pip install -e . -r requirements-dev.txt `
### Running the tests
You can run the tests with:
`sh py.test tests `
Or you can install tox to run the full test suite.
### Releasing
Pandoc is required for transforming the markdown README to the proper format to render correctly on pypi.
For Debian-like systems:
` apt install pandoc `
Or on OSX:
`sh brew install pandoc `
To release a new version:
`sh make release bump=$$VERSION_PART_TO_BUMP$$ `
#### How to bumpversion
The 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 the new version explicitly, like make release bump=”–new-version 4.0.0-alpha.1 devnum”
Metadata
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