Index must be called with a collection of some kind: assign column name to dataframe

I have reweightTarget as follows and I want to convert it to a pandas Dataframe. However, I got following error:

TypeError: Index(…) must be called with a collection of some kind,
‘t’ was passed

If I remove columns='t', it works fine. Can anyone please explain what’s going on?

reweightTarget


Trading dates
2004-01-31    4.35
2004-02-29    4.46
2004-03-31    4.44
2004-04-30    4.39
2004-05-31    4.50
2004-06-30    4.53
2004-07-31    4.63
2004-08-31    4.58
dtype: float64
pd.DataFrame(reweightTarget, columns='t')


---------------------------------------------------------------------------
TypeError                                 Traceback (most recent call last)
<ipython-input-334-bf438351aaf2> in <module>()
----> 1 pd.DataFrame(reweightTarget, columns='t')

C:Anaconda3libsite-packagespandascoreframe.py in __init__(self, data, index, columns, dtype, copy)
    253             else:
    254                 mgr = self._init_ndarray(data, index, columns, dtype=dtype,
--> 255                                          copy=copy)
    256         elif isinstance(data, (list, types.GeneratorType)):
    257             if isinstance(data, types.GeneratorType):

C:Anaconda3libsite-packagespandascoreframe.py in _init_ndarray(self, values, index, columns, dtype, copy)
    421                     raise_with_traceback(e)
    422 
--> 423         index, columns = _get_axes(*values.shape)
    424         values = values.T
    425 

C:Anaconda3libsite-packagespandascoreframe.py in _get_axes(N, K, index, columns)
    388                 columns = _default_index(K)
    389             else:
--> 390                 columns = _ensure_index(columns)
    391             return index, columns
    392 

C:Anaconda3libsite-packagespandasindexesbase.py in _ensure_index(index_like, copy)
   3407             index_like = copy(index_like)
   3408 
-> 3409     return Index(index_like)
   3410 
   3411 

C:Anaconda3libsite-packagespandasindexesbase.py in __new__(cls, data, dtype, copy, name, fastpath, tupleize_cols, **kwargs)
    266                          **kwargs)
    267         elif data is None or lib.isscalar(data):
--> 268             cls._scalar_data_error(data)
    269         else:
    270             if (tupleize_cols and isinstance(data, list) and data and

C:Anaconda3libsite-packagespandasindexesbase.py in _scalar_data_error(cls, data)
    481         raise TypeError('{0}(...) must be called with a collection of some '
    482                         'kind, {1} was passed'.format(cls.__name__,
--> 483                                                       repr(data)))
    484 
    485     @classmethod

TypeError: Index(...) must be called with a collection of some kind, 't' was passed