def timedelta_range(start=None, end=None, periods=None, freq=None,<EOL>name=None, closed=None):
if freq is None and com._any_none(periods, start, end):<EOL><INDENT>freq = '<STR_LIT:D>'<EOL><DEDENT>freq, freq_infer = dtl.maybe_infer_freq(freq)<EOL>tdarr = TimedeltaArray._generate_range(start, end, periods, freq,<EOL>closed=closed)<EOL>return TimedeltaIndex._simple_new(tdarr._data, freq=tdarr.freq, name=name)<EOL>
Return a fixed frequency TimedeltaIndex, with day as the default
frequency

Parameters
----------
start : string or timedelta-like, default None
    Left bound for generating timedeltas
end : string or timedelta-like, default None
    Right bound for generating timedeltas
periods : integer, default None
    Number of periods to generate
freq : string or DateOffset, default 'D'
    Frequency strings can have multiples, e.g. '5H'
name : string, default None
    Name of the resulting TimedeltaIndex
closed : string, default None
    Make the interval closed with respect to the given frequency to
    the 'left', 'right', or both sides (None)

Returns
-------
rng : TimedeltaIndex

Notes
-----
Of the four parameters ``start``, ``end``, ``periods``, and ``freq``,
exactly three must be specified. If ``freq`` is omitted, the resulting
``TimedeltaIndex`` will have ``periods`` linearly spaced elements between
``start`` and ``end`` (closed on both sides).

To learn more about the frequency strings, please see `this link
<http://pandas.pydata.org/pandas-docs/stable/timeseries.html#offset-aliases>`__.

Examples
--------

>>> pd.timedelta_range(start='1 day', periods=4)
TimedeltaIndex(['1 days', '2 days', '3 days', '4 days'],
               dtype='timedelta64[ns]', freq='D')

The ``closed`` parameter specifies which endpoint is included.  The default
behavior is to include both endpoints.

>>> pd.timedelta_range(start='1 day', periods=4, closed='right')
TimedeltaIndex(['2 days', '3 days', '4 days'],
               dtype='timedelta64[ns]', freq='D')

The ``freq`` parameter specifies the frequency of the TimedeltaIndex.
Only fixed frequencies can be passed, non-fixed frequencies such as
'M' (month end) will raise.

>>> pd.timedelta_range(start='1 day', end='2 days', freq='6H')
TimedeltaIndex(['1 days 00:00:00', '1 days 06:00:00', '1 days 12:00:00',
                '1 days 18:00:00', '2 days 00:00:00'],
               dtype='timedelta64[ns]', freq='6H')

Specify ``start``, ``end``, and ``periods``; the frequency is generated
automatically (linearly spaced).

>>> pd.timedelta_range(start='1 day', end='5 days', periods=4)
TimedeltaIndex(['1 days 00:00:00', '2 days 08:00:00', '3 days 16:00:00',
            '5 days 00:00:00'],
           dtype='timedelta64[ns]', freq=None)