guard against invalid key

Author: topper-123

pandas/_libs/index.pyx

@@ -27,7 +27,7 @@ from pandas._libs.missing import checknull
 cdef int64_t NPY_NAT = util.get_nat()
 
 
-cdef inline bint is_definitely_invalid_key(object val):
+cpdef inline bint is_definitely_invalid_key(object val):
     if isinstance(val, tuple):
         try:
             hash(val)

pandas/core/indexes/range.py

@@ -308,12 +308,13 @@ def has_duplicates(self):
 
     @Appender(_index_shared_docs['get_loc'])
     def get_loc(self, key, method=None, tolerance=None):
-        if method is None and tolerance is None:
-            try:
-                return self._range.index(key)
-            except ValueError:
-                raise KeyError(key)
-        return super().__get_loc(key, method=method, tolerance=tolerance)
+        if not libindex.is_definitely_invalid_key(key):
+            if method is None and tolerance is None:
+                try:
+                    return self._range.index(key)
+                except ValueError:
+                    raise KeyError(key)
+        return super().get_loc(key, method=method, tolerance=tolerance)
 
     def tolist(self):
         return list(range(self._start, self._stop, self._step))