pip install sanic-admin

sanic-admin server.py

sanic-admin -urls server.py

{
    // Patterns of filename to be watched
    // default ["*.py"]
    "patterns": ["*.html", "*.css", "*.py"],
    // Paths to be watched
    // default current working directory
    "paths": ["/foo1/bar1", "/foo2/bar2"],
    // File to be executed when sanic-admin starts
    // default None
    "before": "before.py",
    // File to be executed before sanic restarts
    // default None
    "before_each": "before_each.py",
    // File to be executed when sanic-admin exits
    // default None
    "after": "after.py",
    // File to be executed after sanic restarts
    // default None
    "after_each": "after_each.py",
    // Variable name of sanic instance 
    // default "app" 
    "app": "app"
}