3 examples of 'how to round to the nearest tenth in python' in Python

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def closest(number, ndigits=0, resolution=None):
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    """Round a number defining the number of precision decimal digits and
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    the resolution.
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    Examples
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    --------
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    >>> closest(103.66778,)
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    104.0
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    >>> closest(103.66778, ndigits=2)
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    103.67
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    >>> closest(103.66778, ndigits=2, resolution=5)
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    105.0
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    >>> closest(103.66778, ndigits=2, resolution=0.5)
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    103.5
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    >>> closest(103.66778, ndigits=2, resolution=0.25)
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    103.75
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    """
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    num = round(number, ndigits)
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    return (num if resolution is None else
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            round((num // resolution * resolution +
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                   round((num % resolution) / float(resolution), 0) *
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                   resolution), ndigits))

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def nearest(n):
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    """
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    round up or down to nearest int returning an int
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    Used for selecting the nearest pixel position.
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    WARNING, this method is vectorised to handle a numpy array by NumpyImage
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    :param a number or array of numbers: virtual pixel position (x or y)
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    :return int: nearest integer (round up/down)
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    """
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    if type(n) is None: return
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    n=float(n) # make sure n is a float
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    return int(round(n,0))

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def round_to_ten(d):
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  t = int(d//10)*10
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  if t==180: return -180
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  return t