Python也可以编写智能合约:从NEO开始
天道唯
post on 2022-11-26 14:50:19
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环境搭建
基于macOS或Ubuntu,windows用户请自备虚拟机。
安装Docker及拉取镜像
macOS:
1.点我去下载,下载后安装并启动,启动成功后任务栏会有个Docker的图标,点击可以查看运行状态
2.拉取私链镜像,打开终端执行
docker pull cityofzion/neo-privatenet
Tip:由于国内环境问题,docker镜像的拉取往往会非常慢,所以我们可以配置一些国内的镜像加速,如DaoCloud的Docker 加速器,免费注册一下,按照说明配置即可,非常简单和方便。
3.运行Docker容器,执行
Ubuntu:
1.安装Docker,执行
sudo apt install docker.io
2.启动Docker,执行(安装成功后应该会默认已启动)
sudo service docker start
3.拉取私有链网络镜像,执行
sudo docker pull cityofzion/neo-privatenet
4.运行docker容器,执行
sudo docker run --rm -d --name neo-privatenet -p 20333-20336:20333-20336/tcp -p 30333-30336:30333-30336/tcp cityofzion/neo-privatenet
安装Python3和levelDB
macOS:
没有安装过Homebrew的请先执行下面的命令,已安装的忽略。
/usr/bin/ruby -e "$(curl -fsSL https://raw.githubusercontent.com/Homebrew/install/master/install)"
1.macOS是自带Python2的,我们需要安装Python3
brew install python3
2.安装levelDB
brew install leveldb
Ubuntu:
简单粗暴的依次执行下面命令:
sudo apt install software-properties-common python-software-properties
sudo add-apt-repository ppa:deadsnakes/ppa
sudo apt update
sudo apt install python3.6 python3.6-dev python3.6-venv python3-pip libleveldb-dev libssl-dev g++
Tip:因为NEO最低需要Python3.6的环境,Homebrew是会安装最新版本的Python,而apt-get源上直接install python3安装的是python3.5,所以这里我们指定的python3.6。
neo-python
从GitHub克隆neo-python项目
git clone https://github.com/CityOfZion/neo-python.git
创建并进入虚拟环境
cd neo-python
python3 -m venv venv # 创建虚拟环境,Ubuntu这里使用 python3.6 -m venv venv
source venv/bin/activate # 进入虚拟环境,退出虚拟环境使用命令 deactivate
安装依赖包
pip install -r requirements.txt
pip install -e .
启动连接到私有链网络,进入NEO cli命令行
np-prompt -p # 退出命令行 在命令行输入 quit
出现如下界面进入了NEO命令行,那么恭喜你已经成功搭建好所有环境,如果你报错了,请接着往下看。
np-prompt -p 可能出现的错误
错误一
Traceback (most recent call last):
File "/home/parallels/Code/neosc/neo-python/venv/bin/np-prompt", line 11, in
load_entry_point('neo-python', 'console_scripts', 'np-prompt')()
File "/home/parallels/Code/neosc/neo-python/venv/lib/python3.6/site-packages/pkg_resources/__init__.py", line 480, in load_entry_point
return get_distribution(dist).load_entry_point(group, name)
File "/home/parallels/Code/neosc/neo-python/venv/lib/python3.6/site-packages/pkg_resources/__init__.py", line 2693, in load_entry_point
return ep.load()
File "/home/parallels/Code/neosc/neo-python/venv/lib/python3.6/site-packages/pkg_resources/__init__.py", line 2324, in load
return self.resolve()
File "/home/parallels/Code/neosc/neo-python/venv/lib/python3.6/site-packages/pkg_resources/__init__.py", line 2330, in resolve
module = __import__(self.module_name, fromlist=['__name__'], level=0)
File "/home/parallels/Code/neosc/neo-python/neo/bin/prompt.py", line 28, in
from neo.Implementations.Wallets.peewee.UserWallet import UserWallet
File "/home/parallels/Code/neosc/neo-python/neo/Implementations/Wallets/peewee/UserWallet.py", line 8, in
from neo.Wallets.Wallet import Wallet
File "/home/parallels/Code/neosc/neo-python/neo/Wallets/Wallet.py", line 13, in
from Crypto.Cipher import AES
File "/home/parallels/Code/neosc/neo-python/venv/lib/python3.6/site-packages/Crypto/Cipher/__init__.py", line 3, in
from Crypto.Cipher._mode_ecb import _create_ecb_cipher
File "/home/parallels/Code/neosc/neo-python/venv/lib/python3.6/site-packages/Crypto/Cipher/_mode_ecb.py", line 29, in
from Crypto.Util._raw_api import (load_pycryptodome_raw_lib,
File "/home/parallels/Code/neosc/neo-python/venv/lib/python3.6/site-packages/Crypto/Util/_raw_api.py", line 32, in
from Crypto.Util.py3compat import byte_string
ImportError: cannot import name 'byte_string'
这是因为依赖包的版本问题,解决方案如下
# 卸载依赖包
pip uninstall pycrypto
pip uninstall pycryptodemo
# 重新安装依赖包
pip install pycrypto
pip install pycryptodemo
pip install -e .
错误二
......
Traceback (most recent call last):
File "/home/parallels/Code/neosc/neo-python/venv/bin/np-prompt", line 11, in
load_entry_point('neo-python', 'console_scripts', 'np-prompt')()
File "/home/parallels/Code/neosc/neo-python/neo/bin/prompt.py", line 1061, in main
settings.setup_privnet(args.privnet)
File "/home/parallels/Code/neosc/neo-python/neo/Settings.py", line 228, in setup_privnet
self.check_privatenet()
File "/home/parallels/Code/neosc/neo-python/neo/Settings.py", line 314, in check_privatenet
version = client.get_version()
File "/home/parallels/Code/neosc/neo-python/venv/lib/python3.6/site-packages/neorpc/Client.py", line 283, in get_version
return self._call_endpoint(GET_VERSION, id=id, endpoint=endpoint)
File "/home/parallels/Code/neosc/neo-python/venv/lib/python3.6/site-packages/neorpc/Client.py", line 310, in _call_endpoint
raise NEORPCException("Could not call method %s with endpoint: %s : %s " % (method, endpoint.addr, e))
neorpc.Client.NEORPCException: Could not call method getversion with endpoint: http://127.0.0.1:30333 : HTTPConnectionPool(host='127.0.0.1', port=30333): Max retries exceeded with url: / (Caused by NewConnectionError(': Failed to establish a new connection: [Errno 111] Connection refused',))
说明你没有启动docker容器并进行端口映射,请看第一部分安装Docker及拉取镜像
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The opinions expressed are solely those of the author,Does not constitute advice, please treat with caution.
The opinions expressed are solely those of the author,Does not constitute advice, please treat with caution.
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