How to install npm package from python script?

How to install npm package from a python script? When I use `subprocess.Popen(["node", "app.js"])` it is OK. When I use `subprocess.Popen(["npm", "install", "open"])` it is throwing an error. Sorry, but Google and DuckDuckGo are not my friends today( The main problem — automatic local installation required packages for my small utility because global packages are not working in windows. PS. I have to ask this question because I’m trying to develop a plugin for Sublime Text 2. This is the error in Sublime python console: ``` Reloading plugin …\stsync.py Traceback (most recent call last): File ".\sublime_plugin.py", line 103, in create_application_commands cmds.append(class_()) File ".\stsync.py", line 16, in __init__ File ".\subprocess.py", line 633, in __init__ File ".\subprocess.py", line 842, in _execute_child WindowsError: [Error 2] ``` line 16: `subprocess.Popen(["node", "npm", "install", "open"])` If I change line 16 to subprocess.Popen(["node", "npm", "install", "open"]) then the python script will successfully invoke the nodejs terminal, but then it will fail with error: `cannot find npm module`