{"record":{"id":"730615daf513dd8a","repo":"pandas-dev/pandas","slug":"cannot-add-the-type-type-other-name-to-a-t","errorCode":null,"errorMessage":"cannot add the type {type(other).__name__} to a {type(self).__name__}","messagePattern":"cannot add the type (.+?) to a (.+?)","errorType":"exception","errorClass":"TypeError","httpStatus":null,"severity":"error","filePath":"pandas/core/arrays/timedeltas.py","lineNumber":456,"sourceCode":"        return get_format_timedelta64(self, box=True)\n\n    def _format_native_types(\n        self, *, na_rep: str | float = \"NaT\", date_format=None, **kwargs\n    ) -> npt.NDArray[np.object_]:\n        from pandas.io.formats.format import get_format_timedelta64\n\n        # Relies on TimeDelta._repr_base\n        formatter = get_format_timedelta64(self, na_rep)\n        # equiv: np.array([formatter(x) for x in self._ndarray])\n        #  but independent of dimension\n        return np.frompyfunc(formatter, 1, 1)(self._ndarray)\n\n    # ----------------------------------------------------------------\n    # Arithmetic Methods\n\n    def _add_offset(self, other):\n        assert not isinstance(other, (Tick, Day))\n        raise TypeError(\n            f\"cannot add the type {type(other).__name__} to a {type(self).__name__}\"\n        )\n\n    def _mul_float_overflowsafe(\n        self, other: float | np.floating | npt.NDArray[np.floating]\n    ) -> Self:\n        # GH#43178: detect float products that would silently saturate to\n        #  int64.max on the int64 cast below\n        i8 = self.asi8\n        self_mask = i8 == iNaT\n        if self_mask.any():\n            # zero out NaT positions so they don't trigger the bounds check\n            i8 = np.where(self_mask, 0, i8)\n        f_result = i8 * other\n        nan_mask = np.isnan(f_result)\n        non_nan = f_result[~nan_mask]\n        # Compare against 2**63, not i8max: i8max (2**63 - 1) rounds up to\n        #  2**63 in float64, so a product landing exactly on 2**63 would slip","sourceCodeStart":438,"sourceCodeEnd":474,"githubUrl":"https://github.com/pandas-dev/pandas/blob/71959b8cb9b2459c16e14b34f28b178ccfe14735/pandas/core/arrays/timedeltas.py#L438-L474","documentation":"Raised by TimedeltaArray._add_offset when an attempt is made to add a DateOffset/Tick-like object that is not handled by the dedicated Tick/Day fast paths. Timedelta + offset is generally undefined (offsets apply to datetimes, not durations), so adding an arbitrary offset to a TimedeltaArray raises TypeError naming both types. The assert at line 455 excludes Tick/Day which have their own handlers.","triggerScenarios":"Executing `td_arr + pd.offsets.MonthEnd()` or any `timedelta64 + DateOffset` expression. The dispatcher routes offset addition to _add_offset, which rejects non-Tick offsets.","commonSituations":"Treating a duration column like a datetime column and shifting by calendar offsets; merging logic that mixes timedelta and offset arithmetic.","solutions":["If you want to shift datetimes, convert: apply the offset to a datetime Series instead of a timedelta one.","If you need to add a Tick (e.g. pd.offsets.Hour(2)), convert it to a Timedelta first: `td_arr + pd.Timedelta(offset)`.","Re-express the operation: durations add to durations via Timedelta, offsets add to timestamps."],"exampleFix":"# before\narr + pd.offsets.MonthEnd(1)  # TypeError\n# after\n# apply offsets to datetimes, or:\narr + pd.Timedelta(days=1)","handlingStrategy":"type-guard","validationCode":"import pandas as pd\nfrom pandas._libs.tslibs import Timedelta\nfrom pandas.tseries.offsets import Tick, Day\n\ndef add_offset_or_td(td_arr, other):\n    if isinstance(other, (Tick, Day)):\n        return td_arr + pd.Timedelta(other)\n    if isinstance(other, pd.Timestamp):\n        raise TypeError('add offsets to datetimes, not timedeltas')\n    return td_arr + other","typeGuard":"import pandas as pd\nfrom pandas.tseries.offsets import Tick, Day\ndef is_tick_or_timedelta(other) -> bool:\n    return isinstance(other, (Tick, Day, pd.Timedelta))","tryCatchPattern":"try:\n    return td_arr + other\nexcept TypeError as e:\n    if 'cannot add the type' in str(e):\n        return td_arr + pd.Timedelta(other)\n    raise","preventionTips":["Apply DateOffsets to datetime columns, not timedelta columns.","Convert Tick offsets to Timedelta before adding to durations.","Keep offset arithmetic and duration arithmetic in separate code paths."],"tags":["timedelta","dateoffset","arithmetic","typeerror"],"analyzedSha":"71959b8cb9b2459c16e14b34f28b178ccfe14735","analyzedAt":"2026-08-07T01:30:20.476Z","schemaVersion":2},"datasetVersion":"2026-08-07T03:17:09.362Z"}