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virtualenv
Advanced tools
node-virtualenv enables Python dependencies in your node projects, without cluttering up the system environment.
For example, let's add Skype4Py as a dependency to a project. In the package.json, add 2 things:
virtualenv
(this library){
"dependencies": {
"virtualenv": "*"
},
"scripts": {
"postinstall": "virtualenv-postinstall"
}
}
Next, make a requirements.txt in the same directory as package.json, containing this line:
Skype4Py==1.0.35
When you run npm install
, the Skype4Py dependency will be isolated
in a virtualenv located under .node-virtualenv.
Next, spawn your isolated Python virtualenv from node:
var virtualenv = require("virtualenv");
var packagePath = require.resolve("./package.json")
var env = virtualenv(packagePath);
// This is a child_process running Python using your virtualenv. You can
// communicate with it over stdin/stdout, etc.
var child = env.spawnPython(["./my_python_helper.py"]);
You can also spawn
any of the other commands in the virtualenv. For example,
if you added a Python tool like fabric as
a dependency, you can access the command fab
that it installs:
var virtualenv = require("virtualenv");
var packagePath = require.resolve("./package.json")
var env = virtualenv(packagePath);
// This is a child_process running fabric using your virtualenv.
var child = env.spawn("fab", ["deploy", "-H", "example1.net,example2.net"]);
You can modify the way the virtualenv is created during postinstall. For example, if your node module still functions without the Python extras, you can make virtualenv optional (in case the user doesn't have Python). Do this by adding a "virtualenv" key to your package.json:
"virtualenv": {
"optional": true
}
Depend on a specific version of virtualenv:
"virtualenv": {
"version": "15.0.x"
}
Send flags to the virtualenv creation command:
"virtualenv": {
"flags": [
"--system-site-packages"
]
}
Just make a pull request :)
FAQs
install and use Python dependencies in node with virtualenv
The npm package virtualenv receives a total of 50 weekly downloads. As such, virtualenv popularity was classified as not popular.
We found that virtualenv demonstrated a not healthy version release cadence and project activity because the last version was released a year ago. It has 1 open source maintainer collaborating on the project.
Did you know?
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