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• Tutorial on Python decoration, http://thecodeship.com/patterns/guide-to-python-function-decorators/.
• My common mistake when following this tutorial is that I return the function return value instead the returning the function itself.
• This is the mistake.

def decorator():
    def wrapper():
        """Doing something."""
        return True
    return wrapper()

• Where it is supposed to be like this.

def decorator():
    def wrapper():
        """Doing something."""
        return True
    return wrapper

• Screenshot.