intro: 02-modules

Author: edoardob90

exercises/01_intro/02_modules/Cargo.toml

@@ -4,6 +4,8 @@ version = "0.1.0"
 edition = "2021"
 
 [lib]
+# Setting "name" here is optional. If not set, by default the value in the [package] section is used.
+# name = "modules"
 crate-type = ["cdylib"]
 
 [dependencies]

exercises/01_intro/02_modules/src/lib.rs

@@ -6,9 +6,12 @@ fn it_works() -> bool {
     true
 }
 
-/// A Python module implemented in Rust.
+// A Python module implemented in Rust.
+// When Python imports a module names `modules`, it's looking for a function called
+// PyInit_modules. Rust code here was creating a function named `learn_modules`.
+// The module name in Rust code **must** match the library name.
 #[pymodule]
-fn learn_modules(m: &Bound<'_, PyModule>) -> PyResult<()> {
+fn modules(m: &Bound<'_, PyModule>) -> PyResult<()> {
     m.add_function(wrap_pyfunction!(it_works, m)?)?;
     Ok(())
 }