refactor to validate_all_hashable

Author: topper-123

pandas/core/dtypes/common.py

@@ -1732,6 +1732,29 @@ def _validate_date_like_dtype(dtype) -> None:
         )
 
 
+def validate_all_hashable(*args) -> None:
+    """
+    Return None if all args are hashable, else raise a TypeError.
+
+    Raises
+    ------
+    TypeError : If an argument is not hashable
+
+    Returns
+    -------
+    None
+
+    Examples
+    --------
+    >>> validate_all_hashable(1)
+
+    >>> validate_all_hashable([1])
+    ValueError: All elements must be hashable
+    """
+    if not all(is_hashable(x) for x in args):
+        raise TypeError("All elements must be hashable")
+
+
 def pandas_dtype(dtype) -> DtypeObj:
     """
     Convert input into a pandas only dtype object or a numpy dtype object.

pandas/core/indexes/base.py

@@ -58,6 +58,7 @@
     is_timedelta64_dtype,
     is_unsigned_integer_dtype,
     pandas_dtype,
+    validate_all_hashable,
 )
 from pandas.core.dtypes.concat import concat_compat
 from pandas.core.dtypes.generic import (
@@ -1208,10 +1209,9 @@ def _validate_names(self, name=None, names=None, deep: bool = False) -> List[Lab
             raise ValueError(
                 f"Length of new names must be {len(self.names)}, got {len(new_names)}"
             )
+
         # All items in 'new_names' need to be hashable
-        for new_name in new_names:
-            if not is_hashable(new_name):
-                raise TypeError(f"{type(self).__name__}.name must be a hashable type")
+        validate_all_hashable(*new_names)
 
         return new_names
 
@@ -1241,9 +1241,8 @@ def _set_names(self, values, level=None):
 
         # GH 20527
         # All items in 'name' need to be hashable:
-        for name in values:
-            if not is_hashable(name):
-                raise TypeError(f"{type(self).__name__}.name must be a hashable type")
+        validate_all_hashable(*values)
+
         self._name = values[0]
 
     names = property(fset=_set_names, fget=_get_names)