diff --git a/libs/DR-rs/Difficult_Rocket_rs/__init__.pyi b/libs/DR-rs/Difficult_Rocket_rs/__init__.pyi
new file mode 100644
index 0000000..a778b88
--- /dev/null
+++ b/libs/DR-rs/Difficult_Rocket_rs/__init__.pyi
@@ -0,0 +1,9 @@
+#  -------------------------------
+#  Difficult Rocket
+#  Copyright © 2021-2022 by shenjackyuanjie 3695888@qq.com
+#  All rights reserved
+#  -------------------------------
+
+def sum_as_string(a: int, b: int) -> int: ...
+
+def for_x_in_range(a: int, b: int) -> None: ...
diff --git a/libs/DR-rs/setup.py b/libs/DR-rs/setup.py
index bb30ebc..a042091 100644
--- a/libs/DR-rs/setup.py
+++ b/libs/DR-rs/setup.py
@@ -3,14 +3,16 @@
 #  Copyright © 2020-2023 by shenjackyuanjie 3695888@qq.com
 #  All rights reserved
 #  -------------------------------
-
+import sys
 from setuptools import setup
 from setuptools_rust import Binding, RustExtension
 
 setup(
-    name='Difficult_Rocket-rs',
+    name='Difficult_Rocket_rs',
     version='0.0.0.1',
-    rust_extensions=[RustExtension("Difficult_Rocket-rs.Difficult_Rocket-rs", binding=Binding.PyO3)],
-    packages=['Difficult_Rocket-rs'],
+    rust_extensions=[RustExtension("Difficult_Rocket_rs.Difficult_Rocket_rs", binding=Binding.PyO3)],
+    packages=['Difficult_Rocket_rs'],
     zip_safe=False
 )
+
+print(sys.platform)
diff --git a/libs/DR-rs/src/lib.rs b/libs/DR-rs/src/lib.rs
index 92adf16..4bbc282 100644
--- a/libs/DR-rs/src/lib.rs
+++ b/libs/DR-rs/src/lib.rs
@@ -6,11 +6,22 @@ fn sum_as_string(a: usize, b: usize) -> PyResult<String> {
     Ok((a + b).to_string())
 }
 
+#[pyfunction]
+fn for_x_in_range(a: usize, b: usize) -> PyResult<()> {
+    assert!(a <= b);
+    for x in a..b {
+        println!("{}", x);
+    }
+    Ok(())
+}
+
 /// A Python module implemented in Rust. The name of this function must match
 /// the `lib.name` setting in the `Cargo.toml`, else Python will not be able to
 /// import the module.
 #[pymodule]
-fn string_sum(_py: Python<'_>, m: &PyModule) -> PyResult<()> {
+#[allow(non_snake_case)]
+fn Difficult_Rocket_rs(_py: Python<'_>, m: &PyModule) -> PyResult<()> {
     m.add_function(wrap_pyfunction!(sum_as_string, m)?)?;
+    m.add_function(wrap_pyfunction!(for_x_in_range, m)?)?;
     Ok(())
 }
\ No newline at end of file