Python Node and SDK for the NEO blockchain.

• This project aims to be a full port of the original C# neo project
• Run a python based P2P node
• Interactive CLI for configuring node and inspecting block chain
• Runs smart contracts on the block chain in a python virtual machine

• Wallet functionality
• Full python RPC client
• Compile smart contracts written python and deploy to blockchain
• Full smart contract debugging and inspection

• Open a new issue if you encounter a problem.
• Or ping @localhuman on the NEO Slack.
• Pull requests welcome. You can help with wallet functionality, writing tests or documentation, or on any other feature you deem awesome. All successful pull requests will be rewarded with one photo of a cat or kitten.

• Open-source Apache 2.0.
• Main author is @localhuman.

you will need to install the libleveldb library.

brew install leveldb

apt-get -s install libleveldb-dev

yum -y install development tools python35 python35-devel python35-pip readline-devel leveldb-devel libffi-devel

you may need to enable the epel repo for the leveldb-devel package, which you can do by editing /etc/yum.repos.d/epel.repo

make a python 3 virtual environment, and activate it

python3 -m venv venv
source venv/bin/activate

then install requirements

pip install -r requirements.txt

if you're having an issue similar to this:

    from ._plyvel import (  # noqa
    ImportError: dlopen(neo-python/venv/lib/python3.5/site-packages/plyvel/_plyvel.cpython-35m-darwin.so, 2): Symbol not found: __ZN7leveldb2DB4OpenERKNS_7Options
    ERKSsPPS0_
    Referenced from: neo-python/venv/lib/python3.5/site-packages/plyvel/_plyvel.cpython-35m-darwin.so
    Expected in: flat namespace

You may need to uninstall plyvel (python libleveldb library), and reinstall with the following cflags

pip uninstall plyvel
CFLAGS='-mmacosx-version-min=10.7 -stdlib=libc++' pip install --no-use-wheel plyvel --no-cache-dir

After installing requirements and activating your environment, there is an easy to use prompt.py file for you to run the node as well as some basic interactivity

python prompt.py 
NEO cli. Type 'help' to get started

neo> show state
Progress: 1054913 / 1237188

neo> 

You can query for a block in the current server by hash or by block index:

python prompt.py 
NEO cli. Type 'help' to get started

neo> show block 122235
{
    "index": 122235,
    "script": "",
    "merkleroot": "1d5a895ea34509a83becb5d2f9391018a3f59d670d94a2c3f8deb509a07464bd",
    "previousblockhash": "98ae05cb68ab857659cc6c8379eb7ba68b57ef1f5317904c295341d82d0a1713",
    "tx": [
        "1d5a895ea34509a83becb5d2f9391018a3f59d670d94a2c3f8deb509a07464bd"
    ],
    "version": 0,
    "time": 1479110368,
    "hash": "74671375033f506325ef08d35632f74083cca564dc7ea6444c94d3b9dec3f61b",
    "consensus data": 16070047272025254767,
    "next_consensus": "59e75d652b5d3827bf04c165bbe9ef95cca4bf55"
}
neo> 

On OSX, if you would like to run the process in the background, even when your computer is sleeping, you can use the built in caffeinate command

caffeinate python prompt.py

Currently, prompt.py logs to prompt.log

Tests are important. Currently there are not enough, but we are working on that. You can start them by running this command

Note that some of the unit tests use a giant blockchain fixture database ( around 800mb ). This file is not kept in the repo.

When running tests the first time, the test setup will try to download the file and extract it to the proper directory

Long story short, the first time you run your tests, it will take a while to download those fixtures. After that it should be pretty quick.

python -m unittest discover neo 

To run tests with coverage, use the following

coverage run -m unittest discover neo

After that, you can generate a command line coverage report use the following:

coverage report -m --omit=venv/*