fixup for CategoricalIndex merge

Author: jreback

doc/source/whatsnew/v0.16.1.txt

@@ -167,7 +167,7 @@ Index Representation
 ~~~~~~~~~~~~~~~~~~~~
 
 The string representation of ``Index`` and its sub-classes have now been unified. These are all uniform in their output
-formats, except for ``MultiIndex``, which has a multi-line repr. The display width responds to the option ``display.max_seq_len``,
+formats to a single line, except for ``MultiIndex/CategoricalIndex``, which have a multi-line repr. The display width responds to the option ``display.max_seq_len``,
 which is now defaulted to 10 (previously was 100). (:issue:`6482`)
 
 Previous Behavior

pandas/core/common.py

@@ -3132,7 +3132,7 @@ def in_ipython_frontend():
 #    working with straight ascii.
 
 
-def _pprint_seq(seq, _nest_lvl=0, **kwds):
+def _pprint_seq(seq, _nest_lvl=0, max_seq_items=None, **kwds):
     """
     internal. pprinter for iterables. you should probably use pprint_thing()
     rather then calling this directly.
@@ -3144,12 +3144,15 @@ def _pprint_seq(seq, _nest_lvl=0, **kwds):
     else:
         fmt = u("[%s]") if hasattr(seq, '__setitem__') else u("(%s)")
 
-    nitems = get_option("max_seq_items") or len(seq)
+    if max_seq_items is False:
+        nitems = len(seq)
+    else:
+        nitems = max_seq_items or get_option("max_seq_items") or len(seq)
 
     s = iter(seq)
     r = []
     for i in range(min(nitems, len(seq))):  # handle sets, no slicing
-        r.append(pprint_thing(next(s), _nest_lvl + 1, **kwds))
+        r.append(pprint_thing(next(s), _nest_lvl + 1, max_seq_items=max_seq_items, **kwds))
     body = ", ".join(r)
 
     if nitems < len(seq):
@@ -3160,7 +3163,7 @@ def _pprint_seq(seq, _nest_lvl=0, **kwds):
     return fmt % body
 
 
-def _pprint_dict(seq, _nest_lvl=0, **kwds):
+def _pprint_dict(seq, _nest_lvl=0, max_seq_items=None, **kwds):
     """
     internal. pprinter for iterables. you should probably use pprint_thing()
     rather then calling this directly.
@@ -3170,11 +3173,14 @@ def _pprint_dict(seq, _nest_lvl=0, **kwds):
 
     pfmt = u("%s: %s")
 
-    nitems = get_option("max_seq_items") or len(seq)
+    if max_seq_items is False:
+        nitems = len(seq)
+    else:
+        nitems = max_seq_items or get_option("max_seq_items") or len(seq)
 
     for k, v in list(seq.items())[:nitems]:
-        pairs.append(pfmt % (pprint_thing(k, _nest_lvl + 1, **kwds),
-                             pprint_thing(v, _nest_lvl + 1, **kwds)))
+        pairs.append(pfmt % (pprint_thing(k, _nest_lvl + 1, max_seq_items=max_seq_items, **kwds),
+                             pprint_thing(v, _nest_lvl + 1, max_seq_items=max_seq_items, **kwds)))
 
     if nitems < len(seq):
         return fmt % (", ".join(pairs) + ", ...")
@@ -3183,7 +3189,7 @@ def _pprint_dict(seq, _nest_lvl=0, **kwds):
 
 
 def pprint_thing(thing, _nest_lvl=0, escape_chars=None, default_escapes=False,
-                 quote_strings=False):
+                 quote_strings=False, max_seq_items=None):
     """
     This function is the sanctioned way of converting objects
     to a unicode representation.
@@ -3202,6 +3208,8 @@ def pprint_thing(thing, _nest_lvl=0, escape_chars=None, default_escapes=False,
         replacements
     default_escapes : bool, default False
         Whether the input escape characters replaces or adds to the defaults
+    max_seq_items : False, int, default None
+        Pass thru to other pretty printers to limit sequence printing
 
     Returns
     -------
@@ -3240,11 +3248,11 @@ def as_escaped_unicode(thing, escape_chars=escape_chars):
         return compat.text_type(thing)
     elif (isinstance(thing, dict) and
           _nest_lvl < get_option("display.pprint_nest_depth")):
-        result = _pprint_dict(thing, _nest_lvl, quote_strings=True)
+        result = _pprint_dict(thing, _nest_lvl, quote_strings=True, max_seq_items=max_seq_items)
     elif is_sequence(thing) and _nest_lvl < \
             get_option("display.pprint_nest_depth"):
         result = _pprint_seq(thing, _nest_lvl, escape_chars=escape_chars,
-                             quote_strings=quote_strings)
+                             quote_strings=quote_strings, max_seq_items=max_seq_items)
     elif isinstance(thing, compat.string_types) and quote_strings:
         if compat.PY3:
             fmt = "'%s'"

pandas/core/index.py

@@ -26,8 +26,10 @@
 from pandas.io.common import PerformanceWarning
 
 # simplify
-default_pprint = lambda x: com.pprint_thing(x, escape_chars=('\t', '\r', '\n'),
-                                            quote_strings=True)
+default_pprint = lambda x, max_seq_items=None: com.pprint_thing(x,
+                                                                escape_chars=('\t', '\r', '\n'),
+                                                                quote_strings=True,
+                                                                max_seq_items=max_seq_items)
 
 
 __all__ = ['Index']
@@ -2852,32 +2854,22 @@ def equals(self, other):
 
         return False
 
-    def __unicode__(self):
+    def _format_attrs(self):
         """
-        Return a string representation for this object.
-
-        Invoked by unicode(df) in py2 only. Yields a Unicode String in both
-        py2/py3.
+        Return a list of tuples of the (attr,formatted_value)
         """
+        attrs = [('categories', default_pprint(self.categories, max_seq_items=False)),
+                 ('ordered',self.ordered)]
+        if self.name is not None:
+            attrs.append(('name',default_pprint(self.name)))
+        attrs.append(('dtype',"'%s'" % self.dtype))
+        return attrs
 
-        # currently doesn't use the display.max_categories, or display.max_seq_len
-        # for head/tail printing
-        values = default_pprint(self.values.get_values())
-        cats = default_pprint(self.categories.get_values())
-        space = ' ' * (len(self.__class__.__name__) + 1)
-        name = self.name
-        if name is not None:
-            name = default_pprint(name)
-
-        result = u("{klass}({values},\n{space}categories={categories},\n{space}ordered={ordered},\n{space}name={name})").format(
-            klass=self.__class__.__name__,
-            values=values,
-            categories=cats,
-            ordered=self.ordered,
-            name=name,
-            space=space)
+    def _format_space(self):
+        return "\n%s" % (' ' * (len(self.__class__.__name__) + 1))
 
-        return result
+    def _format_data(self):
+        return default_pprint(self.values.get_values(), max_seq_items=False)
 
     @property
     def inferred_type(self):
@@ -3932,8 +3924,8 @@ def _format_attrs(self):
         """
         Return a list of tuples of the (attr,formatted_value)
         """
-        attrs = [('levels', default_pprint(self.levels)),
-                 ('labels', default_pprint(self.labels))]
+        attrs = [('levels', default_pprint(self._levels, max_seq_items=False)),
+                 ('labels', default_pprint(self._labels, max_seq_items=False))]
         if not all(name is None for name in self.names):
             attrs.append(('names', default_pprint(self.names)))
         if self.sortorder is not None:

pandas/tests/test_index.py

@@ -1686,7 +1686,7 @@ def test_get_indexer(self):
         self.assertRaises(NotImplementedError, lambda : idx2.get_indexer(idx1, method='backfill'))
         self.assertRaises(NotImplementedError, lambda : idx2.get_indexer(idx1, method='nearest'))
 
-    def test_repr(self):
+    def test_repr_roundtrip(self):
 
         ci = CategoricalIndex(['a', 'b'], categories=['a', 'b'], ordered=True)
         str(ci)
@@ -4386,6 +4386,23 @@ def test_repr_with_unicode_data(self):
             index = pd.DataFrame(d).set_index(["a", "b"]).index
             self.assertFalse("\\u" in repr(index))  # we don't want unicode-escaped
 
+    def test_repr_roundtrip(self):
+
+        mi = MultiIndex.from_product([list('ab'),range(3)],names=['first','second'])
+        str(mi)
+        tm.assert_index_equal(eval(repr(mi)),mi,exact=True)
+
+        # formatting
+        if compat.PY3:
+            str(mi)
+        else:
+            compat.text_type(mi)
+
+        # long format
+        mi = MultiIndex.from_product([list('abcdefg'),range(10)],names=['first','second'])
+        result = str(mi)
+        tm.assert_index_equal(eval(repr(mi)),mi,exact=True)
+
     def test_str(self):
         # tested elsewhere
         pass