diff --git a/cl/_testpy/callpy/out.ll b/cl/_testpy/callpy/out.ll
index 001dd685..c1589558 100644
--- a/cl/_testpy/callpy/out.ll
+++ b/cl/_testpy/callpy/out.ll
@@ -4,8 +4,8 @@ source_filename = "main"
 @"main.init$guard" = global ptr null
 @__llgo_argc = global ptr null
 @__llgo_argv = global ptr null
-@sqrt = external global ptr
-@getcwd = external global ptr
+@__llgo_py.math.sqrt = linkonce global ptr null
+@__llgo_py.os.getcwd = linkonce global ptr null
 @0 = private unnamed_addr constant [14 x i8] c"sqrt(2) = %f\0A\00", align 1
 @1 = private unnamed_addr constant [10 x i8] c"cwd = %s\0A\00", align 1
 
@@ -31,8 +31,8 @@ _llgo_0:
   call void @"github.com/goplus/llgo/internal/runtime.init"()
   call void @main.init()
   %2 = call ptr @PyFloat_FromDouble(double 2.000000e+00)
-  %3 = call ptr @PyObject_CallOneArg(ptr @sqrt, ptr %2)
-  %4 = call ptr @PyObject_CallNoArg(ptr @getcwd)
+  %3 = call ptr @PyObject_CallOneArg(ptr @__llgo_py.math.sqrt, ptr %2)
+  %4 = call ptr @PyObject_CallNoArgs(ptr @__llgo_py.os.getcwd)
   %5 = call double @PyFloat_AsDouble()
   %6 = call i32 (ptr, ...) @printf(ptr @0, double %5)
   %7 = call ptr @PyBytes_AsString()
@@ -50,7 +50,7 @@ declare ptr @PyFloat_FromDouble(double)
 
 declare ptr @PyObject_CallOneArg(ptr, ptr)
 
-declare ptr @PyObject_CallNoArg(ptr)
+declare ptr @PyObject_CallNoArgs(ptr)
 
 declare double @PyFloat_AsDouble()
 
diff --git a/cl/compile.go b/cl/compile.go
index fd96cbdf..d762356a 100644
--- a/cl/compile.go
+++ b/cl/compile.go
@@ -285,13 +285,18 @@ func (p *context) compileFuncDecl(pkg llssa.Package, f *ssa.Function) (llssa.Fun
 // funcOf returns a function by name and set ftype = goFunc, cFunc, etc.
 // or returns nil and set ftype = llgoCstr, llgoAlloca, llgoUnreachable, etc.
 func (p *context) funcOf(fn *ssa.Function) (aFn llssa.Function, pyFn llssa.PyFunction, ftype int) {
-	_, name, ftype := p.funcName(fn, false)
+	pkgTypes, name, ftype := p.funcName(fn, false)
 	switch ftype {
 	case pyFunc:
-		pkg := p.pkg
-		if pyFn = pkg.PyFuncOf(name); pyFn == nil {
-			pyFn = pkg.NewPyFunc(name, fn.Signature)
+		if kind, mod := pkgKindByScope(pkgTypes.Scope()); kind == PkgPyModule {
+			pkg := p.pkg
+			fnName := pysymPrefix + mod + "." + name
+			if pyFn = pkg.PyFuncOf(fnName); pyFn == nil {
+				pyFn = pkg.NewPyFunc(fnName, fn.Signature)
+				return
+			}
 		}
+		ftype = ignoredFunc
 	case llgoInstr:
 		switch name {
 		case "cstr":
diff --git a/py/math/llgo_autogen.lla b/py/math/llgo_autogen.lla
new file mode 100644
index 00000000..1daa2e16
Binary files /dev/null and b/py/math/llgo_autogen.lla differ
diff --git a/py/os/llgo_autogen.lla b/py/os/llgo_autogen.lla
new file mode 100644
index 00000000..b018d58d
Binary files /dev/null and b/py/os/llgo_autogen.lla differ
diff --git a/ssa/decl.go b/ssa/decl.go
index b89243fa..7c2b6933 100644
--- a/ssa/decl.go
+++ b/ssa/decl.go
@@ -298,7 +298,10 @@ func (p Package) NewPyFunc(name string, sig *types.Signature) PyFunction {
 	if v, ok := p.pyfns[name]; ok {
 		return v
 	}
-	obj := p.NewVar(name, p.Prog.PyObjectPtrPtr().RawType(), InC)
+	prog := p.Prog
+	obj := p.NewVar(name, prog.PyObjectPtrPtr().RawType(), InC)
+	obj.Init(prog.Null(obj.Type))
+	obj.impl.SetLinkage(llvm.LinkOnceAnyLinkage)
 	ty := &aType{obj.ll, rawType{sig}, vkPyFunc}
 	expr := Expr{obj.impl, ty}
 	ret := &aPyFunction{expr, obj}
diff --git a/ssa/package.go b/ssa/package.go
index cb3691b3..e64df9c3 100644
--- a/ssa/package.go
+++ b/ssa/package.go
@@ -137,7 +137,7 @@ type aProgram struct {
 	pyObjPPtr Type
 
 	pyImpTy    *types.Signature
-	callNoArg  *types.Signature
+	callNoArgs *types.Signature
 	callOneArg *types.Signature
 
 	needRuntime bool
@@ -485,14 +485,14 @@ func (p Program) tyImportPyModule() *types.Signature {
 	return p.pyImpTy
 }
 
-func (p Program) tyCallNoArg() *types.Signature {
-	if p.callNoArg == nil {
+func (p Program) tyCallNoArgs() *types.Signature {
+	if p.callNoArgs == nil {
 		objPtr := p.PyObjectPtr().raw.Type
 		paramObjPtr := types.NewParam(token.NoPos, nil, "", objPtr)
 		params := types.NewTuple(paramObjPtr)
-		p.callNoArg = types.NewSignatureType(nil, nil, nil, params, params, false)
+		p.callNoArgs = types.NewSignatureType(nil, nil, nil, params, params, false)
 	}
-	return p.callNoArg
+	return p.callNoArgs
 }
 
 func (p Program) tyCallOneArg() *types.Signature {
@@ -531,7 +531,7 @@ func (b Builder) pyCall(fn Expr, args []Expr) (ret Expr) {
 	n := params.Len()
 	switch n {
 	case 0:
-		call := pkg.pyFunc("PyObject_CallNoArg", prog.tyCallNoArg())
+		call := pkg.pyFunc("PyObject_CallNoArgs", prog.tyCallNoArgs())
 		ret = b.Call(call, fn)
 	case 1:
 		call := pkg.pyFunc("PyObject_CallOneArg", prog.tyCallOneArg())