diff --git a/cl/_testpy/callpy/in.go b/cl/_testpy/callpy/in.go
index 21ec21ab..12424d62 100644
--- a/cl/_testpy/callpy/in.go
+++ b/cl/_testpy/callpy/in.go
@@ -4,9 +4,12 @@ import (
 	"github.com/goplus/llgo/c"
 	"github.com/goplus/llgo/py"
 	"github.com/goplus/llgo/py/math"
+	"github.com/goplus/llgo/py/os"
 )
 
 func main() {
 	x := math.Sqrt(py.Float(2))
+	wd := os.Getcwd()
 	c.Printf(c.Str("sqrt(2) = %f\n"), x.Float64())
+	c.Printf(c.Str("cwd = %s\n"), wd.CStr())
 }
diff --git a/cl/_testpy/callpy/out.ll b/cl/_testpy/callpy/out.ll
index c5c1d258..1f6d541c 100644
--- a/cl/_testpy/callpy/out.ll
+++ b/cl/_testpy/callpy/out.ll
@@ -5,9 +5,13 @@ source_filename = "main"
 @__llgo_argc = global ptr null
 @__llgo_argv = global ptr null
 @__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
 @__llgo_py.math = external global ptr
-@1 = private unnamed_addr constant [5 x i8] c"sqrt\00", align 1
+@2 = private unnamed_addr constant [5 x i8] c"sqrt\00", align 1
+@__llgo_py.os = external global ptr
+@3 = private unnamed_addr constant [7 x i8] c"getcwd\00", align 1
 
 define void @main.init() {
 _llgo_0:
@@ -17,8 +21,11 @@ _llgo_0:
 _llgo_1:                                          ; preds = %_llgo_0
   store i1 true, ptr @"main.init$guard", align 1
   call void @"github.com/goplus/llgo/py/math.init"()
+  call void @"github.com/goplus/llgo/py/os.init"()
   %1 = load ptr, ptr @__llgo_py.math, align 8
-  call void (ptr, ...) @llgoLoadPyModSyms(ptr %1, ptr @1, ptr @__llgo_py.math.sqrt, ptr null)
+  call void (ptr, ...) @llgoLoadPyModSyms(ptr %1, ptr @2, ptr @__llgo_py.math.sqrt, ptr null)
+  %2 = load ptr, ptr @__llgo_py.os, align 8
+  call void (ptr, ...) @llgoLoadPyModSyms(ptr %2, ptr @3, ptr @__llgo_py.os.getcwd, ptr null)
   br label %_llgo_2
 
 _llgo_2:                                          ; preds = %_llgo_1, %_llgo_0
@@ -35,23 +42,33 @@ _llgo_0:
   %2 = call ptr @PyFloat_FromDouble(double 2.000000e+00)
   %3 = load ptr, ptr @__llgo_py.math.sqrt, align 8
   %4 = call ptr @PyObject_CallOneArg(ptr %3, ptr %2)
-  %5 = call double @PyFloat_AsDouble(ptr %4)
-  %6 = call i32 (ptr, ...) @printf(ptr @0, double %5)
+  %5 = load ptr, ptr @__llgo_py.os.getcwd, align 8
+  %6 = call ptr @PyObject_CallNoArgs(ptr %5)
+  %7 = call double @PyFloat_AsDouble(ptr %4)
+  %8 = call i32 (ptr, ...) @printf(ptr @0, double %7)
+  %9 = call ptr @PyBytes_AsString(ptr %6)
+  %10 = call i32 (ptr, ...) @printf(ptr @1, ptr %9)
   ret void
 }
 
 declare void @"github.com/goplus/llgo/py/math.init"()
 
+declare void @"github.com/goplus/llgo/py/os.init"()
+
 declare void @"github.com/goplus/llgo/internal/runtime.init"()
 
 declare ptr @PyFloat_FromDouble(double)
 
 declare ptr @PyObject_CallOneArg(ptr, ptr)
 
+declare ptr @PyObject_CallNoArgs(ptr)
+
 declare double @PyFloat_AsDouble(ptr)
 
 declare i32 @printf(ptr, ...)
 
+declare ptr @PyBytes_AsString(ptr)
+
 declare void @llgoLoadPyModSyms(ptr, ...)
 
 declare void @Py_Initialize()