Installation (Windows)¶

The instructions are written for Windows 7 x64 with MSYS2 environment and Visual Studio 2017. It should probably work for other Windows distributions. Another option is to setup a Linux Subsystem with Ubuntu (see also here for more infos and a guide).

Note: Installing “Ubuntu” from Microsoft Store installs Ubuntu 16.04. You should install Ubuntu 18.04 from Microsoft Store found here: https://www.microsoft.com/en-us/p/ubuntu-1804/9n9tngvndl3q?activetab=pivot%3aoverviewtab

Building LevelDB¶

The easiest way to install leveldb on Windows is using VC++ packaging tool. If you have windows x64 you may need to set an environment variable set VCPKG_DEFAULT_TRIPLET=x64-windows before installation.

git clone https://github.com/Microsoft/vcpkg
cd vcpkg
.\bootstrap-vcpkg.bat
.\vcpkg integrate install
.\vcpkg install leveldb

Installing python dependencies¶

Install Anaconda package manager. Activate python virtual environment.

conda create -n neo python=3.6.4
activate neo

(Optional) Activate your Visual Studio build environment e.g.

"e:\Program Files\Microsoft Visual Studio\2017\Community\VC\Auxiliary\Build\vcvars64.bat"

Building plyvel (1.0.4)¶

Make sure the compiler is able to access .lib and headers of leveldb. Copy them to your destination of MSVS build tools:

from vcpkg\installed\x64-windows\include\ to e:\Program Files\Microsoft Visual Studio\2017\Community\VC\Tools\MSVC\14.12.25827\include and

from vcpkg\installed\x64-windows\lib\libleveldb.lib to e:\Program Files\Microsoft Visual Studio\2017\Community\VC\Tools\MSVC\14.12.25827\lib\x64\leveldb.lib

After that, clone the repository, move to the required version, install cython, build python extensions from c++ files and finally install plyvel.

git clone https://github.com/wbolster/plyvel
cd plyvel
git checkout e3887a5fae5d7b8414eac4c185c1e3b0cebbdba8
pip install cython
cython --cplus --fast-fail --annotate plyvel/_plyvel.pyx
python setup.py build_ext --inplace --force
python setup.py install

Building peewee (2.10.2)¶

git clone https://github.com/coleifer/peewee
cd peewee
git checkout 761f9144a0e17381147a81658019cffe14c118ca
python setup.py install

Building mmh3 (2.5.1)¶

git clone https://github.com/hajimes/mmh3
cd mmh3
git checkout a73b373858dedfdb6d362f5ca985ae1bb6bc2161
python setup.py install

Installing dependencies from Anaconda¶

Some of the dependencies could not be installed from pip in a correct way, but Anaconda works well.

conda install twisted==17.9.0
conda install pycrypto==2.6.1

Install neo-python¶

Navigate into the neo-python directory and install other dependencies via

pip install -r requirements.txt

Check the installation python prompt.py

Troubleshooting¶

Probably you could encounter some issues if you haven’t followed the guide strictly. Some solutions are listed here.

LINK : fatal error LNK1181: cannot open input file ‘leveldb.lib’¶

Make sure the compiler is able to access .lib and headers of leveldb.

error LNK2001: unresolved external symbol __imp_PathFileExistsW¶

Find library shlwapi.lib somewhere, probably it already exists on your filesystem. Merge it into leveldb.lib: lib.exe /OUT:newleveldb.lib leveldb.lib ShLwApi.Lib and replace the original file.

ImportError: No module named ‘winrandom’¶

Navigate into package directory of your python distribution e.g. e:\Programs\Anaconda3\envs\neo\Lib\site-packages.

Change the string import winrandom to from . import winrandom in Crypto\Random\OSRNG\nt.py

ImportError: No module named ‘win32api’¶

Install module pip install pypiwin32