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nodepy / Nodepy

Licence: mit
A Node.js-like runtime for Python.

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126664 projects - #7 most used programming language is a Python runtime and package manager compatible with CPython 2.7 and 3.3 – 3.6. It provides a separate import mechanism for modules inspired by Node.js, bringing dependency management and ease of deployment for Python applications up to par with other languages without virtual environments. comes with a built-in package manager that builds on Pip for standard Python dependencies but also adds the capability to install packages that are specifically developed for To install the dependencies of the package manager you must specify the [pm] install extra. is inspired by Node.js.


$ pip install nodepy-runtime[nppm]

Usage Example allows you to write very modular Python applications with module import semantics that are more easily trackable. From a language standpoint, it is a superset of standard Python. It provides some syntactic sugar as well as additional built-ins for scripts loaded with

Built-in Description
require An instance of the Require class created specificially your module. Allows you to load other modules like require('./module')
module The PythonModule object that represents your module.
Concept Description
if require.main == module: The way of saying if __name__ == '__main__':.
import <...> from '<module-name>' Syntactic sugar for the require() built-in function.
namespace <name>: Similar to a class declaration, but a module is created instead.

Example script

import flask
import sys
import cli from './cli'
app = flask.Flask('myapp')
import './models'
if require.main == module:

Example nodepy.json

  "name": "myapp",
  "pip_dependencies": {
    "Flask": ">=1.0.2",
    "pony": ">=0.7.3"
  "dependencies": {
    "werkzeug-reloader-patch": "^0.0.7"


FileNotFoundError: No such file or directory: '...\installed-files.txt'

This is a bug that will be fixed with Pip 9.0.2. In the meantime, to fix this issues, ensure that you have the wheel package installed.

pip3 install wheel [--user]



  • Fix duplicate execution of code specified with the -c option
  • Add namespace <name>: declaration concept (nodepy.extensions.NamespaceSyntax)
  • Create a package.yaml file for the Pliz setupfiles renderer
  • Deliver NPPM as part of

v2.1.5 (2018-08-18)

  • Add Request.copy() method

v2.1.4 (2018-08-13)

  • Handle relative package links (actually already in 2.1.3)

v2.1.3 (2018-08-13)

  • Fix PythonLoader.suggest_files(), no longer replaces an existing suffix when trying to add .py suffix

v2.1.2 (2018-06-15)

  • Fix which now includes requirements.txt (required by

v2.1.1 (2018-06-14)

  • Release date fix for v2.1.0

v2.1.0 (2018-06-14)

  • Rename nodepy-pm to nppm in
  • Add MIT license to the header of all source files

v2.0.3 (2018-06-03)

  • The nodepy.base.Module() constructor now accepts absolute filenames only
  • Update to include Markdown long_description and read install requirements from requirements.txt

v2.0.2 (2018-03-30)

  • The local .nodepy/pip directory is now always added to sys.path by using the EntryModule.run_with_exec_handler() method instead of loading and executing the module directly
  • PythonLoader.load() no longer adds to sys.path if the path already is in the list

v2.0.1 (2017-12-19)

  • PythonLoader._load_code() now uses utf8 encoding by default, however we should try to peek into the file to see if it contains a coding: comment
  • Always add local modules_directory to Context resolve path, this helps projects that use package links
  • repl can now also import from .nodepy/pip directory
  • Fix resolve_root outside of package root
  • Don't import pathlib from nodepy.utils.path, but instead import pathlib2 directly. We decided on not using std pathlib if it is available, as there can be minor differences
  • Add missing strict=False to UrlPath.resolve() and ZipPath.resolve()
  • Add info to nodepy.runtime.scripts that it can also holds an args member
  • resolve_root now taken into account for default Package.main if it is not explicitly defined, add resolve_root when package entry point is required
  • StdResolver.package_for_directory() must resolve the path to eliminate pardir elements, otherwise we can end up with two Packages pointing to the same directory, but one contains subdir/.. elements
  • Update property to be able to produce a requirable module name for modules outside a package's resolve_root
  • Fixed comparing RequestString with actual request str in Request.try_() to properly raise TryResolveError
  • Fix FrameDebugger parent calls for Python 2
  • Add Config.sections(), remove debug print in Context.__init__()
  • Remove nodepy.default_context, but add nodepy.get_default_context() instead
  • Add nodepy.utils.config module and add Context.config member which is initialized from the NODEPY_CONFIG file or ~/.nodepy/config

v2.0.0 (2018-11-24)

  • Complete rewrite
  • Abstract module resolving interface
  • Using the pathlib2 module to abstract the filesystem

Copyright © 2018 Niklas Rosenstein

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