handle replace list with scalar case

Author: minggli

pandas/core/missing.py

@@ -37,16 +37,24 @@ def mask_missing(arr, values_to_mask):
     except Exception:
         values_to_mask = np.array(values_to_mask, dtype=object)
 
+    if values_to_mask.ndim == 1 and values_to_mask.size == 0:
+        values_to_mask = values_to_mask[np.newaxis, :]
+
     na_mask = isna(values_to_mask)
     nonna = values_to_mask[~na_mask]
 
+    if values_to_mask.ndim == 2 and nonna.ndim == 1:
+        nonna = nonna[np.newaxis, :]
+
     mask = None
     for x in nonna:
         if mask is None:
 
             # numpy elementwise comparison warning
             if is_numeric_v_string_like(arr, x):
                 mask = False
+            elif arr.dtype.kind == 'O':
+                mask = np.array([i == x.tolist() for i in arr.ravel()])
             else:
                 mask = arr == x
 
@@ -59,6 +67,8 @@ def mask_missing(arr, values_to_mask):
             # numpy elementwise comparison warning
             if is_numeric_v_string_like(arr, x):
                 mask |= False
+            elif arr.dtype.kind == 'O':
+                mask |= np.array([i == x.tolist() for i in arr.ravel()])
             else:
                 mask |= arr == x