- add __len__ to PyShape

src/py.rs

@@ -2025,6 +2025,10 @@ impl PyShape {
         }
     }
 
+    fn __len__(&self) -> usize {
+        self.inner.order.len()
+    }
+
     fn to_list(&self) -> Vec<usize> {
         vec![
             self.inner.c,