API (switch_case) error message enhancement. test=develop (#23429)

python/paddle/fluid/layers/control_flow.py

@@ -3361,24 +3361,14 @@ def switch_case(branch_index, branch_fns, default=None, name=None):
     helper = LayerHelper('switch_case', **locals())
 
     def _check_args(branch_index, branch_fns, default):
-        if not isinstance(branch_index, Variable):
-            raise TypeError(
-                _error_message("The type", "branch_index", "switch_case",
-                               "Variable", type(branch_index)))
 
-        if convert_dtype(branch_index.dtype) not in ["uint8", "int32", "int64"]:
-            raise TypeError(
-                _error_message("The data type", "branch_index", "switch_case",
-                               "uint8, int32 or int64",
-                               convert_dtype(branch_index.dtype)))
+        check_variable_and_dtype(branch_index, 'branch_index',
+                                 ['uint8', 'int32', 'int64'], 'switch_case')
 
         if convert_dtype(branch_index.dtype) != "int64":
             branch_index = cast(branch_index, "int64")
 
-        if not isinstance(branch_fns, (list, tuple, dict)):
-            raise TypeError(
-                _error_message("The type", "branch_fns", "switch_case",
-                               "dict, tuple or list", type(branch_fns)))
+        check_type(branch_fns, 'branch_fns', (list, tuple, dict), 'switch_case')
 
         branch_fns = branch_fns.items() if isinstance(branch_fns,
                                                       dict) else branch_fns
@@ -3391,7 +3381,7 @@ def switch_case(branch_index, branch_fns, default=None, name=None):
             if not isinstance(index_fn_pair, tuple):
                 raise TypeError(
                     _error_message("The elements' type", "branch_fns",
-                                   "switch_case", "tuple", type(branch_fns)))
+                                   "switch_case", tuple, type(branch_fns)))
 
             if len(index_fn_pair) != 2:
                 raise TypeError(
@@ -3404,7 +3394,7 @@ def switch_case(branch_index, branch_fns, default=None, name=None):
             if not isinstance(key, int):
                 raise TypeError(
                     _error_message("The key's type", "branch_fns",
-                                   "switch_case", "int", type(key)))
+                                   "switch_case", int, type(key)))
 
             if key in keys_of_fns:
                 raise ValueError(