diff --git a/pandas/core/dtypes/inference.py b/pandas/core/dtypes/inference.py
index de240a39e2951..3c28bd0c0a843 100644
--- a/pandas/core/dtypes/inference.py
+++ b/pandas/core/dtypes/inference.py
@@ -417,8 +417,8 @@ def is_dataclass(item):
 
     """
     try:
-        from dataclasses import is_dataclass
+        import dataclasses
 
-        return is_dataclass(item) and not isinstance(item, type)
+        return dataclasses.is_dataclass(item) and not isinstance(item, type)
     except ImportError:
         return False
diff --git a/pandas/core/frame.py b/pandas/core/frame.py
index efad2edddf360..b465761c45c78 100644
--- a/pandas/core/frame.py
+++ b/pandas/core/frame.py
@@ -6493,9 +6493,8 @@ def drop_duplicates(
 
         inplace = validate_bool_kwarg(inplace, "inplace")
         ignore_index = validate_bool_kwarg(ignore_index, "ignore_index")
-        duplicated = self.duplicated(subset, keep=keep)
 
-        result = self[-duplicated]
+        result = self[-self.duplicated(subset, keep=keep)]
         if ignore_index:
             result.index = default_index(len(result))