PyNone is here:

RustPython/vm/src/builtins/singletons.rs

Line 12 in 8fc2c39

pub struct PyNone;

You can implement Comparable for PyNone like other types. e.g.

Lines 441 to 468 in 8fc2c39

    
           impl Comparable for PyRange { 
        
               fn cmp( 
        
                   zelf: &Py<Self>, 
        
                   other: &PyObject, 
        
                   op: PyComparisonOp, 
        
                   _vm: &VirtualMachine, 
        
               ) -> PyResult<PyComparisonValue> { 
        
                   op.eq_only(|| { 
        
                       if zelf.is(other) { 
        
                           return Ok(true.into()); 
        
                       } 
        
                       let rhs = class_or_notimplemented!(Self, other); 
        
                       let lhs_len = zelf.compute_length(); 
        
                       let eq = if lhs_len != rhs.compute_length() { 
        
                           false 
        
                       } else if lhs_len.is_zero() { 
        
                           true 
        
                       } else if zelf.start.as_bigint() != rhs.start.as_bigint() { 
        
                           false 
        
                       } else if lhs_len.is_one() { 
        
                           true 
        
                       } else { 
        
                           zelf.step.as_bigint() == rhs.step.as_bigint() 
        
                       }; 
        
                       Ok(eq.into()) 
        
                   }) 
        
               } 
        
           }

	impl Comparable for PyRange {
	fn cmp(
	zelf: &Py<Self>,
	other: &PyObject,
	op: PyComparisonOp,
	_vm: &VirtualMachine,
	) -> PyResult<PyComparisonValue> {
	op.eq_only(\|\| {
	if zelf.is(other) {
	return Ok(true.into());
	}
	let rhs = class_or_notimplemented!(Self, other);
	let lhs_len = zelf.compute_length();
	let eq = if lhs_len != rhs.compute_length() {
	false
	} else if lhs_len.is_zero() {
	true
	} else if zelf.start.as_bigint() != rhs.start.as_bigint() {
	false
	} else if lhs_len.is_one() {
	true
	} else {
	zelf.step.as_bigint() == rhs.step.as_bigint()
	};
	Ok(eq.into())
	})
	}
	}

None.__ne__(None) behavior is changed in 3.12 #5103

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None.ne(None) behavior is changed in 3.12 #5103