trace_function decorator doesn't properly show the arguments

[dhylands]

As presented, the trace_function

def trace_function(f):
    """Add tracing before and after a function"""
    def new_f(*args):
        """The decorated function."""
        print('Called {}({!r})'.format(f, *args))
        result = f(*args)
        print('Returning', result)
        return result
    return new_f

if __name__ == '__main__':
    def add(a, b):
        return a + b

    traced_add = trace_function(add)
    traced_add(2, 3)

only prints the first argument:

Called <function add at 0x7fe633b77950>(2)
Returning 5

By changing the first print line to look like:

        print('Called {}{!r}'.format(f, args))

then it will print all of the arguments:

Called <function add at 0x7f509a9c7950>(2, 3)
Returning 5