diff --git a/kaldifeat/csrc/feature-mfcc.h b/kaldifeat/csrc/feature-mfcc.h
index 2c00b7f..2d45b2c 100644
--- a/kaldifeat/csrc/feature-mfcc.h
+++ b/kaldifeat/csrc/feature-mfcc.h
@@ -53,20 +53,18 @@ struct MfccOptions {
 
   std::string ToString() const {
     std::ostringstream os;
-    os << "frame_opts: \n";
-    os << frame_opts << "\n";
-    os << "\n";
+    os << "MfccOptions(";
+    os << "frame_opts=" << frame_opts.ToString() << ", ";
+    os << "mel_opts=" << mel_opts.ToString() << ", ";
 
-    os << "mel_opts: \n";
-    os << mel_opts << "\n";
+    os << "num_ceps=" << num_ceps << ", ";
+    os << "use_energy=" << (use_energy ? "True" : "False") << ", ";
+    os << "energy_floor=" << energy_floor << ", ";
+    os << "raw_energy=" << (raw_energy ? "True" : "False") << ", ";
+    os << "cepstral_lifter=" << cepstral_lifter << ", ";
+    os << "htk_compat=" << (htk_compat ? "True" : "False") << ", ";
+    os << "device=\"" << device << "\")";
 
-    os << "num_ceps: " << num_ceps << "\n";
-    os << "use_energy: " << use_energy << "\n";
-    os << "energy_floor: " << energy_floor << "\n";
-    os << "raw_energy: " << raw_energy << "\n";
-    os << "cepstral_lifter: " << cepstral_lifter << "\n";
-    os << "htk_compat: " << htk_compat << "\n";
-    os << "device: " << device << "\n";
     return os.str();
   }
 };
diff --git a/kaldifeat/python/csrc/feature-fbank.cc b/kaldifeat/python/csrc/feature-fbank.cc
index 07dbed8..a7ed09a 100644
--- a/kaldifeat/python/csrc/feature-fbank.cc
+++ b/kaldifeat/python/csrc/feature-fbank.cc
@@ -16,14 +16,14 @@ static void PybindFbankOptions(py::module &m) {
   using PyClass = FbankOptions;
   py::class_<PyClass>(m, "FbankOptions")
       .def(py::init<>())
-      .def(py::init([](const FrameExtractionOptions &frame_opts =
+      .def(py::init([](const MelBanksOptions &mel_opts,
+                       const FrameExtractionOptions &frame_opts =
                            FrameExtractionOptions(),
                        bool use_energy = false, float energy_floor = 0.0f,
                        bool raw_energy = true, bool htk_compat = false,
                        bool use_log_fbank = true, bool use_power = true,
-                       py::object device = py::str("cpu"),
-                       const MelBanksOptions &mel_opts)
-                        -> std::unique_ptr<FbankOptions> {
+                       py::object device =
+                           py::str("cpu")) -> std::unique_ptr<FbankOptions> {
              auto opts = std::make_unique<FbankOptions>();
              opts->frame_opts = frame_opts;
              opts->mel_opts = mel_opts;
@@ -39,11 +39,12 @@ static void PybindFbankOptions(py::module &m) {
 
              return opts;
            }),
+           py::arg("mel_opts"),
            py::arg("frame_opts") = FrameExtractionOptions(),
            py::arg("use_energy") = false, py::arg("energy_floor") = 0.0f,
            py::arg("raw_energy") = true, py::arg("htk_compat") = false,
            py::arg("use_log_fbank") = true, py::arg("use_power") = true,
-           py::arg("device") = py::str("cpu"), py::arg("mel_opts"))
+           py::arg("device") = py::str("cpu"))
       .def_readwrite("frame_opts", &PyClass::frame_opts)
       .def_readwrite("mel_opts", &PyClass::mel_opts)
       .def_readwrite("use_energy", &PyClass::use_energy)
diff --git a/kaldifeat/python/csrc/feature-mfcc.cc b/kaldifeat/python/csrc/feature-mfcc.cc
index fe893cb..44c200d 100644
--- a/kaldifeat/python/csrc/feature-mfcc.cc
+++ b/kaldifeat/python/csrc/feature-mfcc.cc
@@ -16,6 +16,35 @@ void PybindMfccOptions(py::module &m) {
   using PyClass = MfccOptions;
   py::class_<PyClass>(m, "MfccOptions")
       .def(py::init<>())
+      .def(py::init([](const MelBanksOptions &mel_opts,
+                       const FrameExtractionOptions &frame_opts =
+                           FrameExtractionOptions(),
+                       int32_t num_ceps = 13, bool use_energy = true,
+                       float energy_floor = 0.0, bool raw_energy = true,
+                       float cepstral_lifter = 22.0, bool htk_compat = false,
+                       py::object device =
+                           py::str("cpu")) -> std::unique_ptr<MfccOptions> {
+             auto opts = std::make_unique<MfccOptions>();
+             opts->frame_opts = frame_opts;
+             opts->mel_opts = mel_opts;
+             opts->num_ceps = num_ceps;
+             opts->use_energy = use_energy;
+             opts->energy_floor = energy_floor;
+             opts->raw_energy = raw_energy;
+             opts->cepstral_lifter = cepstral_lifter;
+             opts->htk_compat = htk_compat;
+
+             std::string s = static_cast<py::str>(device);
+             opts->device = torch::Device(s);
+
+             return opts;
+           }),
+           py::arg("mel_opts"),
+           py::arg("frame_opts") = FrameExtractionOptions(),
+           py::arg("num_ceps") = 13, py::arg("use_energy") = true,
+           py::arg("energy_floor") = 0.0f, py::arg("raw_energy") = true,
+           py::arg("cepstral_lifter") = 22.0, py::arg("htk_compat") = false,
+           py::arg("device") = py::str("cpu"))
       .def_readwrite("frame_opts", &PyClass::frame_opts)
       .def_readwrite("mel_opts", &PyClass::mel_opts)
       .def_readwrite("num_ceps", &PyClass::num_ceps)
diff --git a/kaldifeat/python/tests/test_mfcc_options.py b/kaldifeat/python/tests/test_mfcc_options.py
index cef03ab..c650f46 100755
--- a/kaldifeat/python/tests/test_mfcc_options.py
+++ b/kaldifeat/python/tests/test_mfcc_options.py
@@ -12,6 +12,7 @@ import kaldifeat
 
 def test_default():
     opts = kaldifeat.MfccOptions()
+    print(opts)
 
     assert opts.frame_opts.samp_freq == 16000
     assert opts.frame_opts.frame_shift_ms == 10.0