TST: created testcase for python2

Author: deflatSOCO

pandas/tests/io/formats/test_to_csv.py

@@ -498,4 +498,4 @@ def test_to_csv_write_to_open_file_with_newline_py2(self):
                 f.write('manual header\n')
                 df.to_csv(f, header=None, index=None)
             with open(path, 'rb') as f:
-                assert f.read() == bytes(expected, 'utf-8')
+                assert f.read() == expected