---------------------------------------------------------------------------
ValueError                                Traceback (most recent call last)
<ipython-input-14-a39fa18ca12d> in <module>
      4 delta_t = pd.Timedelta("30T")
      5 
----> 6 print(s * delta_t)

~\AppData\Local\Continuum\anaconda3\lib\site-packages\pandas\core\ops\common.py in new_method(self, other)
     62         other = item_from_zerodim(other)
     63 
---> 64         return method(self, other)
     65 
     66     return new_method

~\AppData\Local\Continuum\anaconda3\lib\site-packages\pandas\core\ops\__init__.py in wrapper(left, right)
    498         lvalues = extract_array(left, extract_numpy=True)
    499         rvalues = extract_array(right, extract_numpy=True)
--> 500         result = arithmetic_op(lvalues, rvalues, op, str_rep)
    501 
    502         return _construct_result(left, result, index=left.index, name=res_name)

~\AppData\Local\Continuum\anaconda3\lib\site-packages\pandas\core\ops\array_ops.py in arithmetic_op(left, right, op, str_rep)
    194     else:
    195         with np.errstate(all="ignore"):
--> 196             res_values = na_arithmetic_op(lvalues, rvalues, op, str_rep)
    197 
    198     return res_values

~\AppData\Local\Continuum\anaconda3\lib\site-packages\pandas\core\ops\array_ops.py in na_arithmetic_op(left, right, op, str_rep)
    147 
    148     try:
--> 149         result = expressions.evaluate(op, str_rep, left, right)
    150     except TypeError:
    151         result = masked_arith_op(left, right, op)

~\AppData\Local\Continuum\anaconda3\lib\site-packages\pandas\core\computation\expressions.py in evaluate(op, op_str, a, b, use_numexpr)
    206     use_numexpr = use_numexpr and _bool_arith_check(op_str, a, b)
    207     if use_numexpr:
--> 208         return _evaluate(op, op_str, a, b)
    209     return _evaluate_standard(op, op_str, a, b)
    210 

~\AppData\Local\Continuum\anaconda3\lib\site-packages\pandas\core\computation\expressions.py in _evaluate_numexpr(op, op_str, a, b)
    112             f"a_value {op_str} b_value",
    113             local_dict={"a_value": a_value, "b_value": b_value},
--> 114             casting="safe",
    115         )
    116 

~\AppData\Local\Continuum\anaconda3\lib\site-packages\numexpr\necompiler.py in evaluate(ex, local_dict, global_dict, out, order, casting, **kwargs)
    820     # Create a signature
    821     signature = [(name, getType(arg)) for (name, arg) in
--> 822                  zip(names, arguments)]
    823 
    824     # Look up numexpr if possible.

~\AppData\Local\Continuum\anaconda3\lib\site-packages\numexpr\necompiler.py in <listcomp>(.0)
    819 
    820     # Create a signature
--> 821     signature = [(name, getType(arg)) for (name, arg) in
    822                  zip(names, arguments)]
    823 

~\AppData\Local\Continuum\anaconda3\lib\site-packages\numexpr\necompiler.py in getType(a)
    701     if kind == 'S':
    702         return bytes
--> 703     raise ValueError("unknown type %s" % a.dtype.name)
    704 
    705 

ValueError: unknown type object