Debugging print statements

Attempt to diagnose testing failure of Python 2 test_compression_warning
https://travis-ci.org/pandas-dev/pandas/jobs/407300547#L3853

pandas/io/formats/csvs.py

@@ -134,6 +134,9 @@ def save(self):
             encoding = self.encoding
 
         # GH 21227 internal compression is not used when file-like passed.
+        print('debug_3', self.compression)
+        print('debug_4', self.path_or_buf)
+        print('debug_5', hasattr(self.path_or_buf, 'write'))
         if self.compression and hasattr(self.path_or_buf, 'write'):
             msg = ("compression has no effect when passing file-like "
                    "object as input.")

pandas/tests/test_common.py

@@ -257,8 +257,10 @@ def test_compression_warning(compression_only):
                           [12.32112, 123123.2, 321321.2]],
                    columns=['X', 'Y', 'Z'])
     with tm.ensure_clean() as filename:
+        print('debug_1', compression_only)
         f, _handles = _get_handle(filename, 'w', compression=compression_only)
         with tm.assert_produces_warning(RuntimeWarning,
                                         check_stacklevel=False):
             with f:
+                print('debug_2', compression_only)
                 df.to_csv(f, compression=compression_only)