[Python] Pandas DataFrame mypy error: slice index must be an integer or None

The following line

pd.DataFrame({"col1": [1.1, 2.2]}, index=[3.3, 4.4])[2.5:3.5]


raises a mypy linting error of on the [2.5

Slice index must be an integer or None
​

This is valid syntax and correctly returns

col1
3.3 1.1


Without # type: ignore, how can I resolve this linting error?

versions:

• pandas 1.3.0
• mypy 0.931

The code in question:

def get_dataframe(
ts_data: GroupTs,
ts_group_name: str,
start_time: Optional[float] = None,
end_time: Optional[float] = None,
) -> pd.DataFrame:
df = pd.DataFrame(ts_data.group[ts_group_name].ts_dict)[
start_time:end_time
].interpolate(
method="index", limit_area="inside"
) # type: pd.DataFrame
return df[~df.index.duplicated()]

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