Object Oriented Programming (OOP)¶

In [26]:

class Point2d():
    def __init__(self, x, y, u = 'meter'):

        self.x= x
        self.y = y
        self.__unit = u

    def get_units(self):
        print(self.__unit)

    def set_units(self, u):
        if u.lower() in ['meter', 'inches', 'milimiters', 'centimiters']:
            self.__unit = u
        else:
            print("{} ins not a valid unit".format(u))

    def distance_xy(self, p2d, rnd = None):

        dist = ((self.x - p2d.x)**2 + (self.y - p2d.y)**2 )**.5
        if rnd:
            dist = round(dist, rnd)
        return dist

    def __repr__(self):
        return 'Point Coord \nx: {}\ny: {}\nUnit: {}'.format(self.x, self.y, self.__unit)

In [27]:

p2d_1 = Point2d(3,4.3)
p2d_2 = Point2d(5, 7)

In [28]:

d1 = p2d_1.distance_xy(p2d_2,5)
d1

Out[28]:

3.36006

In [29]:

d1 = p2d_1.distance_xy(p2d_2)
d1

Out[29]:

3.3600595232822887

In [30]:

print(p2d_1)

Point Coord 
x: 3
y: 4.3
Unit: meter

In [31]:

p2d_1.get_units()

meter

Inheritance¶

In [32]:

class Point3d(Point2d):

    def __init__(self, x, y, z, u='meters'):
        Point2d.__init__(self, x, y , u)
        self.z= z
        
    def distance_xyz(self, p2d, rnd = None):
        dist = ((self.x - p2d.x)**2 + (self.y - p2d.y)**2  + (self.z - p2d.z)**2 )**.5
        if rnd:
            dist = round(dist, rnd)
        return dist

    def __repr__(self):
        return 'Point Coord \nx: {}\ny: {}\nz: {}\nUnit: {}'.format(self.x, self.y, self.z, self.__unit)

In [33]:

p3d_1 = Point3d(3,4.3,0)
p3d_2 = Point3d(5, 7,7)

In [34]:

p3d_1.distance_xy(p3d_2)

Out[34]:

3.3600595232822887

In [35]:

p3d_1.distance_xyz(p3d_2)

Out[35]:

7.764663547121665