I'm a little confused about how to do something that I thought would be quite simple. I have a simple app written using Flask. It looks something like this: from flask import Flask app = Flask(__name__) def _run_on_start(a_string): print "doing something important with %s" % a_string @app.route('/') def root(): return 'hello world' if __name__ == "__main__": if len(sys.argv) < 2: raise Exception("Must provide domain for application execution.") else: DOM = sys.argv[1] _run_on_start("%s" % DOM) app.run(debug=True) What I'm finding is that my terminal is outputting the print statements in _run_on_start but non of the other usual Flask app debug code. If I remove the call before app.run, the output is normal. Further I'm finding the output of _run_on_start to be repeated twice on startup, though I don't know if it's some weird output or the function is actually being called twice. I'm assuming this is not the right way to add a function call before you call app.run. I looked in the Flask docs and found mentions of various decorators one can use, which allow you to execute a function before/after certain requests but I want to execute the call when the app server is run. Further, I realise that if I call this module from another module, i.e., not when __name__ != "__main__" my I won't get my call to _run_on_start. What's the right approach here? In both cases when I'm starting from the CL and from another module? Continue reading...
