How to get callback when key expires in REDIS
This feature implemented in Redis 2.8, read about it here http://redis.io/topics/notifications
bottle
Bottle web framework – How to stop?
For the default (WSGIRef) server, this is what I do (actually it is a cleaner approach of Vikram Pudi’s suggestion): from bottle import Bottle, ServerAdapter class MyWSGIRefServer(ServerAdapter): server = None def run(self, handler): from wsgiref.simple_server import make_server, WSGIRequestHandler if self.quiet: class QuietHandler(WSGIRequestHandler): def log_request(*args, **kw): pass self.options[‘handler_class’] = QuietHandler self.server = make_server(self.host, self.port, handler, **self.options) … Read more
How can I get Bottle to restart on file change?
Check out from the tutorial a section entitled “Auto Reloading” During development, you have to restart the server a lot to test your recent changes. The auto reloader can do this for you. Every time you edit a module file, the reloader restarts the server process and loads the newest version of your code. This … Read more
How do I return a JSON array with Bottle?
Bottle’s JSON plugin expects only dicts to be returned – not arrays. There are vulnerabilities associated with returning JSON arrays – see for example this post about JSON hijacking. If you really need to do this, it can be done, e.g. @route(‘/array’) def returnarray(): from bottle import response from json import dumps rv = [{ … Read more
Bottle framework and OOP, using method instead of function
Your code does not work because you are trying to route to non-bound methods. Non-bound methods do not have a reference to self, how could they, if instance of App has not been created? If you want to route to class methods, you first have to initialize your class and then bottle.route() to methods on … Read more
Convert mongodb return object to dictionary
What about just using to_mongo method of an object to convert it to a dict? object.to_mongo()
“getaddrinfo failed”, what does that mean?
It most likely means the hostname can’t be resolved. import socket socket.getaddrinfo(‘localhost’, 8080) If it doesn’t work there, it’s not going to work in the Bottle example. You can try ‘127.0.0.1’ instead of ‘localhost’ in case that’s the problem.
Is there a way to log python print statements in gunicorn?
It turns out the print statements were actually getting through, but with delay. The gunicorn docs for –enable-stdio-inheritance note to set the PYTHONUNBUFFERED, which I thought I had, but it seems with wrong syntax. I solved it using a .env file with my foreman setup to set the variable like this: PYTHONUNBUFFERED=TRUE
What is the difference between the declarative_base() and db.Model?
Looking in the Flask-SQLAlchemy source code the db.Model class is initialized as follows: self.Model = self.make_declarative_base() And here is the make_declarative_base() method: def make_declarative_base(self): “””Creates the declarative base.””” base = declarative_base(cls=Model, name=”Model”, metaclass=_BoundDeclarativeMeta) base.query = _QueryProperty(self) return base The _BoundDeclarativeMeta metaclass is a subclass of SQLAlchemy’s DeclarativeMeta, it simply adds support for computing a default … Read more
How to open a URL in python
with the webbrowser module import webbrowser webbrowser.open(‘http://example.com’) # Go to example.com