Welcome to eth-stdlib’s documentation!
The Ethereum Standard Library is a collection of libraries for developers building on the EVM. The intention is to have a single repository of data structures and utilities which is easy to grok and just as easy to install as a dependency.
Installation
eth-stdlib is available on PyPi for download, and on github for source installs.
Installing via pip:
$ pip install eth-stdlib
Installing via poetry:
$ poetry add eth-stdlib
Optionally, the hypothesis extras can be installed to gain access to built-in testing strategies:
$ pip install eth-stdlib[hypothesis]
Usage
After installing locally, the eth namespace will be available to import in Python applications and scripts.
>>> from eth.codecs import abi
>>> abi.encode("uint256", 42)
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\x00\x00*'
>>> abi.decode("uint8", 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\x00\x00\x10')
16
>>> from eth.hash import keccak256
>>> keccak256(b"Hello World!").hex()
'3ea2f1d0abf3fc66cf29eebb70cbd4e7fe762ef8a09bcc06c8edf641230afec0'