“Unsupported type” even though rsub is defined /u/Informal-Addendum435 Python Education

class Test: def __sub__(self, other): return NotImplemented def __rsub__(self, other): return 1 print(Test() - Test()) 

I would like to make a class that does something on rsub but does nothing on sub.

However, the code above gives

 print(Test() - Test()) ~~~~~~~^~~~~~~~ TypeError: unsupported operand type(s) for -: 'Test' and 'Test' 

even though __rsub__ is defined for Test

I know the docs say

These functions are only called if the left operand does not support the corresponding operation, and the operands are of different types

But how can I do what I want?

class Test: def __sub__(self, other): return NotImplemented def __rsub__(self, other): return 1 print(Test() - Test()) 

I would like to make a class that does something on rsub but does nothing on sub.

However, the code above gives

 print(Test() - Test()) ~~~~~~~^~~~~~~~ TypeError: unsupported operand type(s) for -: 'Test' and 'Test' 

even though __rsub__ is defined for Test

I know the docs say

These functions are only called if the left operand does not support the corresponding operation, and the operands are of different types

But how can I do what I want?