Add float.imag, float.conjugate

tests/snippets/floats.py

@@ -140,6 +140,8 @@ assert_raises(OverflowError, lambda: 1.2 ** (10 ** 1000))
 assert 3 ** 2.0 == 9.0
 
 assert (1.7).real == 1.7
+assert (1.7).imag == 0.0
+assert (1.7).conjugate() == 1.7
 assert (1.3).is_integer() == False
 assert (1.0).is_integer()    == True
 

vm/src/obj/objfloat.rs

@@ -364,6 +364,16 @@ impl PyFloat {
         zelf
     }
 
+    #[pyproperty(name = "imag")]
+    fn imag(&self, _vm: &VirtualMachine) -> f64 {
+        0.0f64
+    }
+
+    #[pymethod(name = "conjugate")]
+    fn conjugate(zelf: PyRef<Self>, _vm: &VirtualMachine) -> PyFloatRef {
+        zelf
+    }
+
     #[pymethod(name = "is_integer")]
     fn is_integer(&self, _vm: &VirtualMachine) -> bool {
         let v = self.value;