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pythonpython-3.xhexmagic-methods

hex() method giving error when used with custom object

I am trying to emulate the built-in hex() method for custom object using magic method __hex__.I am getting the following error which I'm not able to figure out why its doing so.

class Point:
    def __init__(self,x):
        self.x= x

    def __hex__(self):
        return hex(self.x)

p1=Point(10)
print(hex(p1))

TypeError: 'point' object cannot be interpreted as an integer

but when i call hex method using p1.__hex__() instead of hex(p1), the code works fine

>>>print(p1.__hex__())
0xa

can you explain why this is happening?

Solution

  • All you need to do is make an __index__ method:

    class Point:
    def __init__(self, x):
        self.x = x

    def __index__(self):
        return self.x