Add repr flag and length to docs

Author: jschendel

doc/source/api.rst

@@ -1623,6 +1623,7 @@ IntervalIndex Components
    IntervalIndex.right
    IntervalIndex.mid
    IntervalIndex.closed
+   IntervalIndex.length
    IntervalIndex.values
    IntervalIndex.is_non_overlapping_monotonic
 
@@ -1995,6 +1996,7 @@ Properties
     Interval.closed_left
     Interval.closed_right
     Interval.left
+    Interval.length
     Interval.mid
     Interval.open_left
     Interval.open_right

pandas/_libs/interval.pyx

@@ -63,7 +63,7 @@ cdef class IntervalMixin(object):
             return self.right - self.left
         except TypeError:
             # length not defined for some types, e.g. string
-            msg = 'cannot compute length between {left} and {right}'
+            msg = 'cannot compute length between {left!r} and {right!r}'
             raise TypeError(msg.format(left=self.left, right=self.right))
 
 

pandas/core/indexes/interval.py

@@ -118,18 +118,14 @@ class IntervalIndex(IntervalMixin, Index):
 
     Attributes
     ----------
-    left, right : array-like (1-dimensional)
-        Left and right bounds for each interval.
-    closed : {'left', 'right', 'both', 'neither'}, default 'right'
-        Whether the intervals are closed on the left-side, right-side, both or
-        neither.
-    name : object, optional
-        Name to be stored in the index.
-    copy : boolean, default False
-        Copy the meta-data
+    left
+    right
+    closed
     mid
+    length
     values
     is_non_overlapping_monotonic
+    name
 
     Methods
     -------
@@ -138,6 +134,7 @@ class IntervalIndex(IntervalMixin, Index):
     from_breaks
     from_intervals
     contains
+    copy
 
     Examples
     ---------