code: def is_signed_integer(self) -> bool:
      return self.kind == "i"
  
imports: from __future__ import annotations
  import numbers
  from typing import TYPE_CHECKING, Any, Callable, Mapping, TypeVar
  import numpy
  from pandas._libs import lib, missing
  from pandas._typing import Dtype, DtypeObj, npt
  from pandas.errors import AbstractMethodError
  from pandas.util._decorators import cache_readonly
  from pandas.core.dtypes.common import is_bool_dtype, is_float_dtype, is_integer_dtype, is_object_dtype, is_string_dtype, pandas_dtype
  from pandas.core.arrays.masked import BaseMaskedArray, BaseMaskedDtype
label_desc: Use image node_id 2 for calling the NumericDtype obj's underlying member method code with example usage: obj.is_signed_integer() and returns: unknown