How to print from Flask @app.route to python console

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I would like to simply print a "hello world" to the python console after /button is called by the user.

This is my naive approach:

@app.route("/button/")
def button_clicked():
    print "Hello world!"
    return redirect("/")

Background: I would like to execute other python commands from flask (not shell). "print" should be the easiest case. I believe I have not understood a basic twist here. Thanks in advance!

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