df = pandas.DataFrame([{'ts':datetime(2014, 4, 1, tzinfo=pytz.utc), 'foo':1}]) 

df = df.set_index('ts') print(df) 

 foo ts 2014-04-01 00:00:00+00:00 1 

df.index = df['ts'] print(df) 

In [75]: print(df) --------------------------------------------------------------------------- AttributeError Traceback (most recent call last) <ipython-input-75-1152f648e0af> in <module>() ----> 1 print(df) /home/sucram/.virtualenvs/ehubdata/local/lib/python2.7/site-packages/pandas/core/base.pyc in __str__(self) 33 if compat.PY3: 34 return self.__unicode__() ---> 35 return self.__bytes__() 36 37 def __bytes__(self): /home/sucram/.virtualenvs/ehubdata/local/lib/python2.7/site-packages/pandas/core/base.pyc in __bytes__(self) 45 46 encoding = get_option("display.encoding") ---> 47 return self.__unicode__().encode(encoding, 'replace') 48 49 def __repr__(self): /home/sucram/.virtualenvs/ehubdata/local/lib/python2.7/site-packages/pandas/core/frame.pyc in __unicode__(self) 458 width = None 459 self.to_string(buf=buf, max_rows=max_rows, max_cols=max_cols, --> 460 line_width=width, show_dimensions=show_dimensions) 461 462 return buf.getvalue() /home/sucram/.virtualenvs/ehubdata/local/lib/python2.7/site-packages/pandas/core/frame.pyc in to_string(self, buf, columns, col_space, colSpace, header, index, na_rep, formatters, float_format, sparsify, nanRep, index_names, justify, force_unicode, line_width, max_rows, max_cols, show_dimensions) 1297 max_cols=max_cols, 1298 show_dimensions=show_dimensions) -> 1299 formatter.to_string() 1300 1301 if buf is None: /home/sucram/.virtualenvs/ehubdata/local/lib/python2.7/site-packages/pandas/core/format.pyc in to_string(self, force_unicode) 378 text = info_line 379 else: --> 380 strcols = self._to_str_columns() 381 if self.line_width is None: 382 text = adjoin(1, *strcols) /home/sucram/.virtualenvs/ehubdata/local/lib/python2.7/site-packages/pandas/core/format.pyc in _to_str_columns(self) 310 311 # may include levels names also --> 312 str_index = self._get_formatted_index() 313 str_columns = self._get_formatted_column_labels() 314 /home/sucram/.virtualenvs/ehubdata/local/lib/python2.7/site-packages/pandas/core/format.pyc in _get_formatted_index(self) 583 formatter=fmt) 584 else: --> 585 fmt_index = [index.format(name=show_index_names, formatter=fmt)] 586 587 adjoined = adjoin(1, *fmt_index).split('\n') /home/sucram/.virtualenvs/ehubdata/local/lib/python2.7/site-packages/pandas/core/generic.pyc in __getattr__(self, name) 1813 return self[name] 1814 raise AttributeError("'%s' object has no attribute '%s'" % -> 1815 (type(self).__name__, name)) 1816 1817 def __setattr__(self, name, value): AttributeError: 'Series' object has no attribute 'format'