BUG: repr of Series with regular (freq) datetime index after reading with msgpack #24135
Description
From the io docs:
In [18]: s = pd.Series(np.random.rand(5), index=pd.date_range('20130101', periods=5))
In [19]: s
Out[19]:
2013-01-01 0.130706
2013-01-02 0.232104
2013-01-03 0.506547
2013-01-04 0.155568
2013-01-05 0.873604
Freq: D, dtype: float64
In [20]: s.to_msgpack('test.msg')
In [22]: s2 = pd.read_msgpack('test.msg')
In [23]: s2
Out[23]: ---------------------------------------------------------------------------
AttributeError Traceback (most recent call last)
~/miniconda3/envs/dev/lib/python3.5/site-packages/IPython/core/formatters.py in __call__(self, obj)
700 type_pprinters=self.type_printers,
701 deferred_pprinters=self.deferred_printers)
--> 702 printer.pretty(obj)
703 printer.flush()
704 return stream.getvalue()
~/miniconda3/envs/dev/lib/python3.5/site-packages/IPython/lib/pretty.py in pretty(self, obj)
400 if cls is not object \
401 and callable(cls.__dict__.get('__repr__')):
--> 402 return _repr_pprint(obj, self, cycle)
403
404 return _default_pprint(obj, self, cycle)
~/miniconda3/envs/dev/lib/python3.5/site-packages/IPython/lib/pretty.py in _repr_pprint(obj, p, cycle)
695 """A pprint that just redirects to the normal repr function."""
696 # Find newlines and replace them with p.break_()
--> 697 output = repr(obj)
698 for idx,output_line in enumerate(output.splitlines()):
699 if idx:
~/scipy/pandas/pandas/core/base.py in __repr__(self)
75 Yields Bytestring in Py2, Unicode String in py3.
76 """
---> 77 return str(self)
78
79
~/scipy/pandas/pandas/core/base.py in __str__(self)
54
55 if compat.PY3:
---> 56 return self.__unicode__()
57 return self.__bytes__()
58
~/scipy/pandas/pandas/core/series.py in __unicode__(self)
1272
1273 self.to_string(buf=buf, name=self.name, dtype=self.dtype,
-> 1274 max_rows=max_rows, length=show_dimensions)
1275 result = buf.getvalue()
1276
~/scipy/pandas/pandas/core/series.py in to_string(self, buf, na_rep, float_format, header, index, length, dtype, name, max_rows)
1316 float_format=float_format,
1317 max_rows=max_rows)
-> 1318 result = formatter.to_string()
1319
1320 # catch contract violations
~/scipy/pandas/pandas/io/formats/format.py in to_string(self)
258 def to_string(self):
259 series = self.tr_series
--> 260 footer = self._get_footer()
261
262 if len(series) == 0:
~/scipy/pandas/pandas/io/formats/format.py in _get_footer(self)
205
206 if getattr(self.series.index, 'freq', None) is not None:
--> 207 footer += 'Freq: {freq}'.format(freq=self.series.index.freqstr)
208
209 if self.name is not False and name is not None:
~/scipy/pandas/pandas/core/arrays/datetimelike.py in freqstr(self)
502 if self.freq is None:
503 return None
--> 504 return self.freq.freqstr
505
506 @property # NB: override with cache_readonly in immutable subclasses
AttributeError: 'str' object has no attribute 'freqstr'