Issue : #5408 open exists api in operator for python binding

added the exists python binding api

bindings/python/src/operator.rs

@@ -185,7 +185,12 @@ impl Operator {
     pub fn delete(&self, path: &str) -> PyResult<()> {
         self.core.delete(path).map_err(format_pyerr)
     }
-
+
+    // existing the path
+    pub fn exists(&self, path: &str) -> PyResult<bool> {
+        self.core.exists(path).map_err(format_pyerr)
+    }
+
     /// List current dir path.
     pub fn list(&self, path: &str) -> PyResult<BlockingLister> {
         let l = self.core.lister(path).map_err(format_pyerr)?;