Fix Python default argument handing broken since swig-3.0.3

Default values are no longer generated as Python code by default.
They must be explicitly turned on using the "python:defaultargs" feature.

Closes #294
Closes #296

The problems in these two issues when "python:defaultargs" is turned
on still need to be fixed and should be addressed in separate patches.
The important thing is the default code generation is now fixed.

Examples/test-suite/python/Makefile.in

@@ -58,6 +58,7 @@ CPP_TEST_CASES += \
 	primitive_types \
 	python_abstractbase \
 	python_append \
+	python_default_args \
 	python_director \
 	python_nondynamic \
 	python_overload_simple_cast \

Examples/test-suite/python/default_args_runme.py

@@ -1,67 +1,91 @@
-import default_args 
+# Note that this test is also used by python_default_args_runme.py hence the use of __main__ and the run function
 
-ec = default_args.EnumClass()
-if not ec.blah():
-  raise RuntimeError,"EnumClass::blah() default arguments don't work"
+def run(module_name):
+  default_args = __import__(module_name)
+  print "running...."
+  ec = default_args.EnumClass()
+  if not ec.blah():
+    raise RuntimeError,"EnumClass::blah() default arguments don't work"
 
-if default_args.Statics_staticMethod() != 60:
-  raise RuntimeError
-  
-if default_args.cfunc1(1) != 2:
-  raise RuntimeError
+  de = default_args.DerivedEnumClass()
+  de.accelerate()
+  de.accelerate(default_args.EnumClass.SLOW)
 
-if default_args.cfunc2(1) != 3:
-  raise RuntimeError
+  if default_args.Statics_staticMethod() != 60:
+    raise RuntimeError
 
-if default_args.cfunc3(1) != 4:
-  raise RuntimeError
+  if default_args.cfunc1(1) != 2:
+    raise RuntimeError
+
+  if default_args.cfunc2(1) != 3:
+    raise RuntimeError
+
+  if default_args.cfunc3(1) != 4:
+    raise RuntimeError
 
 
-f = default_args.Foo()
+  f = default_args.Foo()
 
-f.newname()
-f.newname(1)
+  f.newname()
+  f.newname(1)
 
 
-try:
-  f = default_args.Foo(1)
-  error = 1
-except:
-  error = 0
-if error:  raise RuntimeError,"Foo::Foo ignore is not working"
+  try:
+    f = default_args.Foo(1)
+    error = 1
+  except:
+    error = 0
+  if error:  raise RuntimeError,"Foo::Foo ignore is not working"
 
-try:
-  f = default_args.Foo(1,2)
-  error = 1
-except:
-  error = 0
-if error:  raise RuntimeError,"Foo::Foo ignore is not working"
+  try:
+    f = default_args.Foo(1,2)
+    error = 1
+  except:
+    error = 0
+  if error:  raise RuntimeError,"Foo::Foo ignore is not working"
 
-try:
-  f = default_args.Foo(1,2,3)
-  error = 1
-except:
-  error = 0
-if error:  raise RuntimeError,"Foo::Foo ignore is not working"
+  try:
+    f = default_args.Foo(1,2,3)
+    error = 1
+  except:
+    error = 0
+  if error:  raise RuntimeError,"Foo::Foo ignore is not working"
 
-try:
-  m = f.meth(1)
-  error = 1
-except:
-  error = 0
-if error:  raise RuntimeError,"Foo::meth ignore is not working"
+  try:
+    m = f.meth(1)
+    error = 1
+  except:
+    error = 0
+  if error:  raise RuntimeError,"Foo::meth ignore is not working"
 
-try:
-  m = f.meth(1,2)
-  error = 1
-except:
-  error = 0
-if error:  raise RuntimeError,"Foo::meth ignore is not working"
+  try:
+    m = f.meth(1,2)
+    error = 1
+  except:
+    error = 0
+  if error:  raise RuntimeError,"Foo::meth ignore is not working"
 
-try:
-  m = f.meth(1,2,3)
-  error = 1
-except:
-  error = 0
-if error:  raise RuntimeError,"Foo::meth ignore is not working"
+  try:
+    m = f.meth(1,2,3)
+    error = 1
+  except:
+    error = 0
+  if error:  raise RuntimeError,"Foo::meth ignore is not working"
+
+  if default_args.Klass.inc(100, default_args.Klass(22)).val != 122:
+    raise RuntimeError, "Klass::inc failed"
+
+  if default_args.Klass.inc(100).val != 99:
+    raise RuntimeError, "Klass::inc failed"
+
+  if default_args.Klass.inc().val != 0:
+    raise RuntimeError, "Klass::inc failed"
+
+  default_args.trickyvalue1(10); default_args.trickyvalue1(10, 10)
+  default_args.trickyvalue2(10); default_args.trickyvalue2(10, 10)
+  default_args.trickyvalue3(10); default_args.trickyvalue3(10, 10)
+  default_args.seek(); default_args.seek(10)
+
+if __name__=="__main__":
+  run('default_args')
 

Examples/test-suite/python/python_default_args_runme.py

@@ -0,0 +1,3 @@
+# Test %feature("python:defaultargs") using the test code in default_args_runme.py (which does not use the feature)
+import default_args_runme
+default_args_runme.run('python_default_args')