simplify construction

Author: minggli

pandas/tests/test_common.py

@@ -226,20 +226,19 @@ def test_standardize_mapping():
     assert isinstance(com.standardize_mapping(dd), partial)
 
 
-@pytest.mark.parametrize('frame', [
-    pd.concat(100 * [DataFrame([[0.123456, 0.234567, 0.567567],
-                                [12.32112, 123123.2, 321321.2]],
-              columns=['X', 'Y', 'Z'])], ignore_index=True),
-    pd.concat(100 * [Series([0.123456, 0.234567, 0.567567], name='X')],
-              ignore_index=True)])
+@pytest.mark.parametrize('obj', [
+    DataFrame(100 * [[0.123456, 0.234567, 0.567567],
+                     [12.32112, 123123.2, 321321.2]],
+              columns=['X', 'Y', 'Z']),
+    Series(100 * [0.123456, 0.234567, 0.567567], name='X')])
 @pytest.mark.parametrize('method', ['to_pickle', 'to_json', 'to_csv'])
-def test_compression_size(frame, method, compression):
+def test_compression_size(obj, method, compression):
     if not compression:
         pytest.skip("only test compression case.")
 
     with tm.ensure_clean() as filename:
-        getattr(frame, method)(filename, compression=compression)
+        getattr(obj, method)(filename, compression=compression)
         compressed = os.path.getsize(filename)
-        getattr(frame, method)(filename, compression=None)
+        getattr(obj, method)(filename, compression=None)
         uncompressed = os.path.getsize(filename)
         assert uncompressed > compressed