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class Vec:
    """ A simple vector class

    Instances of the Vec class  can be constructed from numbers

    >>> a = Vec(1, 2, 3)
    >>> b = Vec(3, 2, 1)

    added
    >>> a + b
    Vec(4, 4, 4)

    subtracted
    >>> a - b
    Vec(-2, 0, 2)

    and multiplied by a scalar on the left
    >>> 3.0 * a
    Vec(3.0, 6.0, 9.0)

    or on the right
    >>> a * 3.0
    Vec(3.0, 6.0, 9.0)
    """
    def __init__(self, *v):
        self.v = list(v)

    @classmethod
    def fromlist(cls, v):
        if not isinstance(v, list):
            raise TypeError
        inst = cls()
        inst.v = v
        return inst

    def __repr__(self):
        args = ', '.join(repr(x) for x in self.v)
        return 'Vec({0})'.format(args)

    def __len__(self):
        return len(self.v)

    def __getitem__(self, i):
        return self.v[i]

    def __add__(self, other):
        # Element-wise addition
        v = [x + y for x, y in zip(self.v, other.v)]
        return Vec.fromlist(v)

    def __sub__(self, other):
        # Element-wise subtraction
        v = [x - y for x, y in zip(self.v, other.v)]
        return Vec.fromlist(v)

    def __mul__(self, scalar):
        # Multiply by scalar
        v = [x * scalar for x in self.v]
        return Vec.fromlist(v)

    __rmul__ = __mul__


def test():
    import doctest
    doctest.testmod()

test()

Filemanager

DIR : / usr/ lib64/ python2.7/ Demo/ classes/
Name Type Size Permission Actions
Complex.py File 9.72 KB 0644
Complex.pyc File 9.79 KB 0644
Complex.pyo File 9.79 KB 0644
Dates.py File 7.64 KB 0644
Dates.pyc File 7.16 KB 0644
Dates.pyo File 7.16 KB 0644
Dbm.py File 1.54 KB 0644
Dbm.pyc File 2.46 KB 0644
Dbm.pyo File 2.46 KB 0644
README File 522 B 0644
Range.py File 3.05 KB 0644
Range.pyc File 4 KB 0644
Range.pyo File 4 KB 0644
Rev.py File 2 KB 0644
Rev.pyc File 2.8 KB 0644
Rev.pyo File 2.8 KB 0644
Vec.py File 1.33 KB 0644
Vec.pyc File 2.75 KB 0644
Vec.pyo File 2.75 KB 0644
bitvec.py File 10.25 KB 0644
bitvec.pyc File 10.05 KB 0644
bitvec.pyo File 10.05 KB 0644