Guess the serialization format AnyType.

Instead of passing the value as-is to lxml the format is now serialized
based on the instance type.

Fixes #552

Author: mvantellingen

src/zeep/xsd/types/any.py

@@ -94,7 +94,22 @@ def resolve(self):
         return self
 
     def xmlvalue(self, value):
-        return value
+        """Guess the xsd:type for the value and use corresponding serializer"""
+        from zeep.xsd.types import builtins
+
+        available_types = [
+            builtins.String,
+            builtins.Boolean,
+            builtins.Decimal,
+            builtins.Float,
+            builtins.DateTime,
+            builtins.Date,
+            builtins.Time,
+        ]
+        for xsd_type in available_types:
+            if isinstance(value, xsd_type.accepted_types):
+                return xsd_type().xmlvalue(value)
+        return str(value)
 
     def pythonvalue(self, value, schema=None):
         return value

tests/test_xsd_any.py

@@ -256,20 +256,20 @@ def test_element_any_type():
     schema = xsd.Schema(node)
 
     container_elm = schema.get_element('{http://tests.python-zeep.org/}container')
-    obj = container_elm(something='bar')
+    obj = container_elm(something=datetime.time(18, 29, 59))
 
     node = etree.Element('document')
     container_elm.render(node, obj)
     expected = """
         <document>
             <ns0:container xmlns:ns0="http://tests.python-zeep.org/">
-                <ns0:something>bar</ns0:something>
+                <ns0:something>18:29:59</ns0:something>
             </ns0:container>
         </document>
     """
     assert_nodes_equal(expected, node)
     item = container_elm.parse(node.getchildren()[0], schema)
-    assert item.something == 'bar'
+    assert item.something == '18:29:59'
 
 
 def test_element_any_type_unknown_type():