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Inheritance.cs
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using
System
;
using
System
.
Collections
.
Generic
;
using
NUnit
.
Framework
;
using
Python
.
Runtime
;
namespace
Python
.
EmbeddingTest
{
public
class
Inheritance
{
[
OneTimeSetUp
]
public
void
SetUp
(
)
{
PythonEngine
.
Initialize
(
)
;
using
var
locals
=
new
PyDict
(
)
;
PythonEngine
.
Exec
(
InheritanceTestBaseClassWrapper
.
ClassSourceCode
,
locals
:
locals
)
;
ExtraBaseTypeProvider
.
ExtraBase
=
new
PyType
(
locals
[
InheritanceTestBaseClassWrapper
.
ClassName
]
)
;
var
baseTypeProviders
=
PythonEngine
.
InteropConfiguration
.
PythonBaseTypeProviders
;
baseTypeProviders
.
Add
(
new
ExtraBaseTypeProvider
(
)
)
;
baseTypeProviders
.
Add
(
new
NoEffectBaseTypeProvider
(
)
)
;
}
[
OneTimeTearDown
]
public
void
Dispose
(
)
{
ExtraBaseTypeProvider
.
ExtraBase
.
Dispose
(
)
;
PythonEngine
.
Shutdown
(
)
;
}
[
Test
]
public
void
ExtraBase_PassesInstanceCheck
(
)
{
var
inherited
=
new
Inherited
(
)
;
bool
properlyInherited
=
PyIsInstance
(
inherited
,
ExtraBaseTypeProvider
.
ExtraBase
)
;
Assert
.
IsTrue
(
properlyInherited
)
;
}
static
dynamic
PyIsInstance
=>
PythonEngine
.
Eval
(
"isinstance"
)
;
[
Test
]
public
void
InheritingWithExtraBase_CreatesNewClass
(
)
{
PyObject
a
=
ExtraBaseTypeProvider
.
ExtraBase
;
var
inherited
=
new
Inherited
(
)
;
PyObject
inheritedClass
=
inherited
.
ToPython
(
)
.
GetAttr
(
"__class__"
)
;
Assert
.
IsFalse
(
PythonReferenceComparer
.
Instance
.
Equals
(
a
,
inheritedClass
)
)
;
}
[
Test
]
public
void
InheritedFromInheritedClassIsSelf
(
)
{
using
var
scope
=
Py
.
CreateScope
(
)
;
scope
.
Exec
(
$
"from
{
typeof
(
Inherited
)
.
Namespace
}
import
{
nameof
(
Inherited
)
}
"
)
;
scope
.
Exec
(
$
"class B(
{
nameof
(
Inherited
)
}
): pass"
)
;
PyObject
b
=
scope
.
Eval
(
"B"
)
;
PyObject
bInstance
=
b
.
Invoke
(
)
;
PyObject
bInstanceClass
=
bInstance
.
GetAttr
(
"__class__"
)
;
Assert
.
IsTrue
(
PythonReferenceComparer
.
Instance
.
Equals
(
b
,
bInstanceClass
)
)
;
}
// https://github.com/pythonnet/pythonnet/issues/1420
[
Test
]
public
void
CallBaseMethodFromContainerInNestedClass
(
)
{
using
var
nested
=
new
ContainerClass
.
InnerClass
(
)
.
ToPython
(
)
;
nested
.
InvokeMethod
(
nameof
(
ContainerClass
.
BaseMethod
)
)
;
}
[
Test
]
public
void
Grandchild_PassesExtraBaseInstanceCheck
(
)
{
using
var
scope
=
Py
.
CreateScope
(
)
;
scope
.
Exec
(
$
"from
{
typeof
(
Inherited
)
.
Namespace
}
import
{
nameof
(
Inherited
)
}
"
)
;
scope
.
Exec
(
$
"class B(
{
nameof
(
Inherited
)
}
): pass"
)
;
PyObject
b
=
scope
.
Eval
(
"B"
)
;
PyObject
bInst
=
b
.
Invoke
(
)
;
bool
properlyInherited
=
PyIsInstance
(
bInst
,
ExtraBaseTypeProvider
.
ExtraBase
)
;
Assert
.
IsTrue
(
properlyInherited
)
;
}
[
Test
]
public
void
CallInheritedClrMethod_WithExtraPythonBase
(
)
{
var
instance
=
new
Inherited
(
)
.
ToPython
(
)
;
string
result
=
instance
.
InvokeMethod
(
nameof
(
PythonWrapperBase
.
WrapperBaseMethod
)
)
.
As
<
string
>
(
)
;
Assert
.
AreEqual
(
result
,
nameof
(
PythonWrapperBase
.
WrapperBaseMethod
)
)
;
}
[
Test
]
public
void
CallExtraBaseMethod
(
)
{
var
instance
=
new
Inherited
(
)
;
using
var
scope
=
Py
.
CreateScope
(
)
;
scope
.
Set
(
nameof
(
instance
)
,
instance
)
;
int
actual
=
instance
.
ToPython
(
)
.
InvokeMethod
(
"callVirt"
)
.
As
<
int
>
(
)
;
Assert
.
AreEqual
(
expected
:
Inherited
.
OverridenVirtValue
,
actual
)
;
}
[
Test
]
public
void
SetAdHocAttributes_WhenExtraBasePresent
(
)
{
var
instance
=
new
Inherited
(
)
;
using
var
scope
=
Py
.
CreateScope
(
)
;
scope
.
Set
(
nameof
(
instance
)
,
instance
)
;
scope
.
Exec
(
$
"super(
{
nameof
(
instance
)
}
.__class__,
{
nameof
(
instance
)
}
).set_x_to_42()"
)
;
int
actual
=
scope
.
Eval
<
int
>
(
$
"
{
nameof
(
instance
)
}
.
{
nameof
(
Inherited
.
XProp
)
}
"
)
;
Assert
.
AreEqual
(
expected
:
Inherited
.
X
,
actual
)
;
}
// https://github.com/pythonnet/pythonnet/issues/1476
[
Test
]
public
void
BaseClearIsCalled
(
)
{
using
var
scope
=
Py
.
CreateScope
(
)
;
scope
.
Set
(
"exn"
,
new
Exception
(
"42"
)
)
;
var
msg
=
scope
.
Eval
(
"exn.args[0]"
)
;
Assert
.
AreEqual
(
2
,
msg
.
Refcount
)
;
scope
.
Set
(
"exn"
,
null
)
;
Assert
.
AreEqual
(
1
,
msg
.
Refcount
)
;
}
// https://github.com/pythonnet/pythonnet/issues/1455
[
Test
]
public
void
PropertyAccessorOverridden
(
)
{
using
var
derived
=
new
PropertyAccessorDerived
(
)
.
ToPython
(
)
;
derived
.
SetAttr
(
nameof
(
PropertyAccessorDerived
.
VirtualProp
)
,
"hi"
.
ToPython
(
)
)
;
Assert
.
AreEqual
(
"HI"
,
derived
.
GetAttr
(
nameof
(
PropertyAccessorDerived
.
VirtualProp
)
)
.
As
<
string
>
(
)
)
;
}
}
class
ExtraBaseTypeProvider
:
IPythonBaseTypeProvider
{
internal
static
PyType
ExtraBase
;
public
IEnumerable
<
PyType
>
GetBaseTypes
(
Type
type
,
IList
<
PyType
>
existingBases
)
{
if
(
type
==
typeof
(
InheritanceTestBaseClassWrapper
)
)
{
return
new
[
]
{
PyType
.
Get
(
type
.
BaseType
)
,
ExtraBase
}
;
}
return
existingBases
;
}
}
class
NoEffectBaseTypeProvider
:
IPythonBaseTypeProvider
{
public
IEnumerable
<
PyType
>
GetBaseTypes
(
Type
type
,
IList
<
PyType
>
existingBases
)
=>
existingBases
;
}
public
class
PythonWrapperBase
{
public
string
WrapperBaseMethod
(
)
=>
nameof
(
WrapperBaseMethod
)
;
}
public
class
InheritanceTestBaseClassWrapper
:
PythonWrapperBase
{
public
const
string
ClassName
=
"InheritanceTestBaseClass"
;
public
const
string
ClassSourceCode
=
"class "
+
ClassName
+
@":
def virt(self):
return 42
def set_x_to_42(self):
self.XProp = 42
def callVirt(self):
return self.virt()
def __getattr__(self, name):
return '__getattr__:' + name
def __setattr__(self, name, value):
value[name] = name
"
+
ClassName
+
" = "
+
ClassName
+
"
\n
"
;
}
public
class
Inherited
:
InheritanceTestBaseClassWrapper
{
public
const
int
OverridenVirtValue
=
-
42
;
public
const
int
X
=
42
;
readonly
Dictionary
<
string
,
object
>
extras
=
new
Dictionary
<
string
,
object
>
(
)
;
public
int
virt
(
)
=>
OverridenVirtValue
;
public
int
XProp
{
get
{
using
(
var
scope
=
Py
.
CreateScope
(
)
)
{
scope
.
Set
(
"this"
,
this
)
;
try
{
return
scope
.
Eval
<
int
>
(
$
"super(this.__class__, this).
{
nameof
(
XProp
)
}
"
)
;
}
catch
(
PythonException
ex
)
when
(
PythonReferenceComparer
.
Instance
.
Equals
(
ex
.
Type
,
Exceptions
.
AttributeError
)
)
{
if
(
this
.
extras
.
TryGetValue
(
nameof
(
this
.
XProp
)
,
out
object
value
)
)
return
(
int
)
value
;
throw
;
}
}
}
set
=>
this
.
extras
[
nameof
(
this
.
XProp
)
]
=
value
;
}
}
public
class
PropertyAccessorBase
{
public
virtual
string
VirtualProp
{
get
;
set
;
}
}
public
class
PropertyAccessorIntermediate
:
PropertyAccessorBase
{
}
public
class
PropertyAccessorDerived
:
PropertyAccessorIntermediate
{
public
override
string
VirtualProp
{
set
=>
base
.
VirtualProp
=
value
.
ToUpperInvariant
(
)
;
}
}
public
class
ContainerClass
{
public
void
BaseMethod
(
)
{
}
public
class
InnerClass
:
ContainerClass
{
}
}
}
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