Python - Add Encoding repr + improve example

bindings/python/src/encoding.rs

@@ -1,8 +1,9 @@
 extern crate tokenizers as tk;
 
 use pyo3::prelude::*;
+use pyo3::PyObjectProtocol;
 
-#[pyclass]
+#[pyclass(dict)]
 #[repr(transparent)]
 pub struct Encoding {
     encoding: tk::tokenizer::Encoding,
@@ -14,6 +15,16 @@ impl Encoding {
     }
 }
 
+#[pyproto]
+impl PyObjectProtocol for Encoding {
+    fn __repr__(&self) -> PyResult<String> {
+        Ok(format!(
+            "Encoding {{ original: '{}', ... }}",
+            self.encoding.get_original()
+        ))
+    }
+}
+
 #[pymethods]
 impl Encoding {
     #[getter]