Added repr string for Grouper and TimeGrouper

Author: tp

pandas/core/groupby.py

@@ -233,6 +233,8 @@ class Grouper(object):
 
     >>> df.groupby(Grouper(level='date', freq='60s', axis=1))
     """
+    _attributes = (('key', None), ('level', None), ('freq', None),
+                   ('axis', 0), ('sort', False))
 
     def __new__(cls, *args, **kwargs):
         if kwargs.get('freq') is not None:
@@ -333,6 +335,16 @@ def _set_grouper(self, obj, sort=False):
     def groups(self):
         return self.grouper.groups
 
+    def __repr__(self):
+        attrs_list = []
+        for attr_name, attr_default in self._attributes:
+            attrib_value = getattr(self, attr_name, attr_default)
+            if attrib_value is not attr_default:
+                attrs_list.append("{}={!r}".format(attr_name, attrib_value))
+        attrs = ", ".join(attrs_list)
+        cls_name = self.__class__.__name__
+        return "{}({})".format(cls_name, attrs)
+
 
 class GroupByPlot(PandasObject):
     """

pandas/core/resample.py

@@ -1025,6 +1025,11 @@ class TimeGrouper(Grouper):
     Use begin, end, nperiods to generate intervals that cannot be derived
     directly from the associated object
     """
+    _attributes = (('key', None), ('level', None), ('freq', 'Min'),
+                   ('sort', False), ('closed', None), ('label', None),
+                   ('how', 'mean'), ('nperiods', None), ('axis', 0),
+                   ('fill_method', None), ('limit', None), ('loffset', None),
+                   ('kind', None), ('convention', None), ('base', 0))
 
     def __init__(self, freq='Min', closed=None, label=None, how='mean',
                  nperiods=None, axis=0,