pyimport & deomo: callpy (todo)

_pydemo/callpy/callpy.go

@@ -0,0 +1,12 @@
+package main
+
+import (
+	"github.com/goplus/llgo/c"
+	"github.com/goplus/llgo/py"
+	"github.com/goplus/llgo/py/math"
+)
+
+func main() {
+	x := math.Sqrt(py.Float(2))
+	c.Printf(c.Str("sqrt(2) = %f\n"), x.FloatAsDouble())
+}

internal/pyimport/pyimport.go

@@ -0,0 +1,32 @@
+/*
+ * Copyright (c) 2024 The GoPlus Authors (goplus.org). All rights reserved.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package pyimport
+
+import (
+	_ "unsafe"
+
+	"github.com/goplus/llgo/c"
+	"github.com/goplus/llgo/py"
+)
+
+func init() {
+	py.Initialize()
+	py.SetProgramName(*c.Argv)
+}
+
+//go:linkname Module C.PyImport_ImportModule
+func Module(name *c.Char) *py.Module

py/_demo/callpy/call.go

@@ -10,7 +10,10 @@ func main() {
 	py.SetProgramName(*c.Argv)
 	math := py.ImportModule(c.Str("math"))
 	sqrt := math.GetAttrString(c.Str("sqrt"))
-	sqrt2 := sqrt.CallOneArg(py.Float(2)).FloatAsDouble()
+	sqrt2 := sqrt.CallOneArg(py.Float(2))
-	c.Printf(c.Str("sqrt(2) = %f\n"), sqrt2)
+	c.Printf(c.Str("sqrt(2) = %f\n"), sqrt2.FloatAsDouble())
+	sqrt2.DecRef()
+	sqrt.DecRef()
+	math.DecRef()
 	py.Finalize()
 }

py/math/math.go

@@ -0,0 +1,27 @@
+/*
+ * Copyright (c) 2024 The GoPlus Authors (goplus.org). All rights reserved.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+// llgo:import py.math
+package math
+
+import (
+	_ "unsafe"
+
+	"github.com/goplus/llgo/py"
+)
+
+//go:linkname Sqrt py.sqrt
+func Sqrt(x *py.Object) *py.Object

py/module.go

@@ -55,13 +55,4 @@ func Import(name *Object) *Module
 // llgo:link (*Module).GetDict C.PyModule_GetDict
 func (m *Module) GetDict() *Object { panic("unreachable") }
 
-// Retrieve an attribute named attrName from object o. Returns the attribute value on success,
-// or nil on failure. This is the equivalent of the Python expression o.attrName.
-//
-// llgo:link (*Object).GetAttr C.PyObject_GetAttr
-func (o *Object) GetAttr(attrName *Object) *Object { panic("unreachable") }
-
-// llgo:link (*Object).GetAttrString C.PyObject_GetAttrString
-func (o *Object) GetAttrString(attrName *c.Char) *Object { panic("unreachable") }
-
 // -----------------------------------------------------------------------------

py/object.go

@@ -40,6 +40,17 @@ func (o *Object) DecRef() { panic("unreachable") }
 
 // -----------------------------------------------------------------------------
 
+// Retrieve an attribute named attrName from object o. Returns the attribute value on success,
+// or nil on failure. This is the equivalent of the Python expression o.attrName.
+//
+// llgo:link (*Object).GetAttr C.PyObject_GetAttr
+func (o *Object) GetAttr(attrName *Object) *Object { panic("unreachable") }
+
+// llgo:link (*Object).GetAttrString C.PyObject_GetAttrString
+func (o *Object) GetAttrString(attrName *c.Char) *Object { panic("unreachable") }
+
+// -----------------------------------------------------------------------------
+
 // Determine if the object o is callable. Return 1 if the object is callable and
 // 0 otherwise. This function always succeeds.
 //