.. function:: round(number[, ndigits])

Return the floating point value *number* rounded to *ndigits* digits after

the decimal point. If *ndigits* is omitted or is ``None``, it returns the

nearest integer to its input. Delegates to ``number.__round__(ndigits)``.

Return *number* rounded to *ndigits* precision after the decimal

point. If *ndigits* is omitted or is ``None``, it returns the

nearest integer to its input.

For the built-in types supporting :func:`round`, values are rounded to the

closest multiple of 10 to the power minus *ndigits*; if two multiples are

negative). The return value is an integer if called with one argument,

otherwise of the same type as *number*.

For a general Python object ``number``, ``round(number, ndigits)`` delegates to

``number.__round__(ndigits)``.

.. note::

The behavior of :func:`round` for floats can be surprising: for example,