Added repr string for Grouper and TimeGrouper

Author: tp

pandas/core/groupby.py

@@ -233,6 +233,7 @@ class Grouper(object):
 
     >>> df.groupby(Grouper(level='date', freq='60s', axis=1))
     """
+    _attributes = ('key', 'level', 'freq', 'axis', 'sort')
 
     def __new__(cls, *args, **kwargs):
         if kwargs.get('freq') is not None:
@@ -333,6 +334,15 @@ def _set_grouper(self, obj, sort=False):
     def groups(self):
         return self.grouper.groups
 
+    def __repr__(self):
+        attrs_list = []
+        for attr_name in self._attributes:
+            attrib_value = getattr(self, attr_name)
+            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 +1025,9 @@ class TimeGrouper(Grouper):
     Use begin, end, nperiods to generate intervals that cannot be derived
     directly from the associated object
     """
+    _attributes = ('key', 'level', 'freq', 'sort', 'closed', 'label',
+                   'how', 'nperiods', 'axis', 'fill_method', 'limit', 'loffset',
+                   'kind', 'convention', 'base')
 
     def __init__(self, freq='Min', closed=None, label=None, how='mean',
                  nperiods=None, axis=0,