Move some imports out of functions to the top of the file

Some of the imports in the array API module have to be inside functions to
avoid circular imports, but these ones did not.

Author: asmeurer

numpy/array_api/_array_object.py

@@ -19,14 +19,17 @@
 from enum import IntEnum
 from ._creation_functions import asarray
 from ._dtypes import (_all_dtypes, _boolean_dtypes, _integer_dtypes,
-                      _integer_or_boolean_dtypes, _floating_dtypes, _numeric_dtypes)
+                      _integer_or_boolean_dtypes, _floating_dtypes,
+                      _numeric_dtypes, _result_type, _dtype_categories)
 
 from typing import TYPE_CHECKING, Optional, Tuple, Union
 if TYPE_CHECKING:
     from ._typing import PyCapsule, Device, Dtype
 
 import numpy as np
 
+from numpy import array_api
+
 class Array:
     """
     n-d array object for the array API namespace.
@@ -98,7 +101,6 @@ def _check_allowed_dtypes(self, other, dtype_category, op):
             if other is NotImplemented:
                 return other
         """
-        from ._dtypes import _result_type, _dtype_categories
 
         if self.dtype not in _dtype_categories[dtype_category]:
             raise TypeError(f'Only {dtype_category} dtypes are allowed in {op}')
@@ -338,7 +340,6 @@ def __and__(self: Array, other: Union[int, bool, Array], /) -> Array:
     def __array_namespace__(self: Array, /, *, api_version: Optional[str] = None) -> object:
         if api_version is not None and not api_version.startswith('2021.'):
             raise ValueError(f"Unrecognized array API version: {api_version!r}")
-        from numpy import array_api
         return array_api
 
     def __bool__(self: Array, /) -> bool: