pythonic way (V2), Python 3

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class P:
    def __init__(self, x=0):
        self.__x = x
        
    def set_x(self, x):
        self.__x = x
        
    def get_x(self):
        return self.__x
    
    
class P2:
    def __init__(self, x=0):
        self.x = x # self.x reference the setter method and not the attr
        
    @property
    def x(self):
        return self.__x

@x.setter
    def x(self, x):
        if x < 0:
            raise ValueError('negativ number not allowed ..warum auch immer...')
        self.__x = x

class P3:
    def __init__(self, x=0, y=0):
        #self.__x = x # we call the setter instead
        self.x = x
        #self.__y = y # we call the setter instead...
        self.y = y
    
    @property
    def x(self):
        return self.__x
    @x.setter    
    def x(self, x):
            self.__x = x if x > 0 else -x
    
    @property
    def y(self):
        return self.__y
    @y.setter
    def y(self, y):
        self.__y = y if y > 0 else -y
        
        
p30 = P3(12,14)
print(p30.x, p30.y)

p30.x = 120
p30.y = 140
print(p30.x, p30.y)
        
p30.x = -120
p30.y = -140
print(p30.x, p30.y)
        
        
        
    
p1 = P()
p2 = P(12)
print("p1.get_x(): {}, p2.get_x(): {}".format(p1.get_x(), p2.get_x()))

p21 = P2()
p22 = P2(12)
print("p21.x: {}, p22.x: {}".format(p21.x, p22.x))

try:
    p33 = P2(-14)
except ValueError as err:
    print('Error has occured:', err)
else:
    print(p33.x)
finally:
    pass

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Absolute running time: 0.12 sec, cpu time: 0.08 sec, memory peak: 6 Mb, absolute service time: 0,13 sec