Default to_csv & to_json to compression='infer'

Author: dhimmel

pandas/core/frame.py

@@ -1713,7 +1713,7 @@ def to_panel(self):
 
     def to_csv(self, path_or_buf=None, sep=",", na_rep='', float_format=None,
                columns=None, header=True, index=True, index_label=None,
-               mode='w', encoding=None, compression=None, quoting=None,
+               mode='w', encoding=None, compression='infer', quoting=None,
                quotechar='"', line_terminator='\n', chunksize=None,
                tupleize_cols=None, date_format=None, doublequote=True,
                escapechar=None, decimal='.'):
@@ -1748,7 +1748,7 @@ def to_csv(self, path_or_buf=None, sep=",", na_rep='', float_format=None,
         encoding : string, optional
             A string representing the encoding to use in the output file,
             defaults to 'ascii' on Python 2 and 'utf-8' on Python 3.
-        compression : {'infer', 'gzip', 'bz2', 'xz', None}, default None
+        compression : {'infer', 'gzip', 'bz2', 'xz', None}, default infer
             If 'infer' and `path_or_buf` is path-like, then detect compression
             from the following extensions: '.gz', '.bz2' or '.xz'
             (otherwise no compression).

pandas/io/json/json.py

@@ -28,7 +28,7 @@
 # interface to/from
 def to_json(path_or_buf, obj, orient=None, date_format='epoch',
             double_precision=10, force_ascii=True, date_unit='ms',
-            default_handler=None, lines=False, compression=None,
+            default_handler=None, lines=False, compression='infer',
             index=True):
 
     if not index and orient not in ['split', 'table']: