def square(value):
    """Returns the square of a number."""
    new_val = value ** 2
    return new_val

square(3)

9

new_val

<hr />----------------------------------------------------------------
NameError                       Traceback (most recent call last)
<ipython-input-3-3cc6c6de5c5c> in <module>()
<hr />-> 1 new_value
NameError: name 'new_val' is not defined