py/objcomplex: Add mp_obj_get_complex_maybe for use in complex bin-op.

This allows complex binary operations to fail gracefully with unsupported
operation rather than raising an exception, so that special methods work
correctly.

Signed-off-by: Damien George <damien@micropython.org>

tests/float/cmath_fun.py

@@ -57,3 +57,9 @@ for f_name, f, test_vals in functions:
             if abs(real) < 1e-6:
                 real = 0.0
             print("complex(%.5g, %.5g)" % (real, ret.imag))
+
+# test invalid type passed to cmath function
+try:
+    log([])
+except TypeError:
+    print("TypeError")

tests/float/complex_special_mehods.py

@@ -0,0 +1,15 @@
+# test complex interacting with special methods
+
+
+class A:
+    def __add__(self, x):
+        print("__add__")
+        return 1
+
+    def __radd__(self, x):
+        print("__radd__")
+        return 2
+
+
+print(A() + 1j)
+print(1j + A())