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Python: Defining class with dependent attributes

user1673
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user1673 Published in May 25, 2018, 8:57 am

I aim to write a class who can be used to calculate all the properties of a device.

import numpy as np


class pythagoras:
    def __init__(self, a=None, b=None, c=None):
        self.a = a
        self.b = b
        self.c = c

        if(a == None):
            assert(b != None)
            assert(c != None)
            self.a = np.sqrt(c**2 - b**2)
        elif(b == None):
            assert(a != None)
            assert(c != None)
            self.b = np.sqrt(c**2 - a**2)
        elif(c == None):
            assert(a != None)
            assert(b != None)
            self.c = np.sqrt(a**2 + b**2)
        else:
            assert (a**2 + b**2 == c**2), "The values are incompatible."


example1 = pythagoras(a=3, b=4)
print(example.c)
# 5
example2 = pythagoras(a=3, c=5)
print(example2.b)
# 4
example3 = pythagoras(b=4, c=5)
print(example3.a)
# 3

So my question is about simplifying this example: Is there a simpler way to implement this kind of problem? For more complex examples it gets quickly rather complex and unmanageable.

Application

The final goal is to have a class with all device properties such as:

class crystal:
    absorption
    refractive_index
    transmission
    reflection
    heat_conductivity
    heat_resistance

Here one can imagine that these properties depend on each other and according to my knowledge of properties, I can infer the rest of the properties.

I am graceful for any remarks about writing better code. Even though I learned and read literature about object-oriented coding, I am inexperienced in writing such.

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