Use Python 3.9-compatible annotation style

icepyx/core/APIformatting.py

@@ -1,7 +1,7 @@
 """Generate and format information for submitting to API (CMR and NSIDC)."""
 
 import datetime as dt
-from typing import Any, Generic, Literal, TypeVar, overload
+from typing import Any, Generic, Literal, TypeVar, Union, overload
 
 from icepyx.core.types import (
     CMRParams,
@@ -226,7 +226,7 @@ def __get__(
         self,
         instance: "Parameters",
         owner: Any,
-    ) -> CMRParams | EGISpecificRequiredParams | EGIParamsSubset:
+    ) -> Union[CMRParams, EGISpecificRequiredParams, EGIParamsSubset]:
         """
         Returns the dictionary of formatted keys associated with the
         parameter object.

icepyx/core/granules.py

@@ -7,6 +7,7 @@
 import pprint
 import re
 import time
+from typing import Optional
 from xml.etree import ElementTree as ET
 import zipfile
 
@@ -176,8 +177,8 @@ def __init__(
 
     def get_avail(
         self,
-        CMRparams: CMRParams | None,
-        reqparams: EGISpecificRequiredParams | None,
+        CMRparams: Optional[CMRParams],
+        reqparams: Optional[EGISpecificRequiredParams],
         cloud=False,
     ):
         """

icepyx/core/query.py

@@ -1,4 +1,5 @@
 import pprint
+from typing import Optional, Union
 
 import geopandas as gpd
 import matplotlib.pyplot as plt
@@ -397,7 +398,7 @@ class Query(GenQuery, EarthdataAuthMixin):
 
     _CMRparams: apifmt.CMRParameters
     _reqparams: apifmt.RequiredParameters
-    _subsetparams: apifmt.SubsetParameters | None
+    _subsetparams: Optional[apifmt.SubsetParameters]
 
     # ----------------------------------------------------------------------
     # Constructors
@@ -605,7 +606,7 @@ def reqparams(self) -> EGISpecificRequiredParams:
     # @property
     # DevQuestion: if I make this a property, I get a "dict" object is not callable
     # when I try to give input kwargs... what approach should I be taking?
-    def subsetparams(self, **kwargs) -> EGIParamsSubset | dict[Never, Never]:
+    def subsetparams(self, **kwargs) -> Union[EGIParamsSubset, dict[Never, Never]]:
         """
         Display the subsetting key:value pairs that will be submitted.
         It generates the dictionary if it does not already exist

icepyx/core/types.py

@@ -1,6 +1,6 @@
 from __future__ import annotations
 
-from typing import Literal, TypedDict
+from typing import Literal, TypedDict, Union
 
 from typing_extensions import NotRequired
 
@@ -48,7 +48,7 @@ class CMRParamsWithPolygon(CMRParamsBase):
     polygon: str
 
 
-CMRParams = CMRParamsWithBbox | CMRParamsWithPolygon
+CMRParams = Union[CMRParamsWithBbox, CMRParamsWithPolygon]
 
 
 class EGISpecificParamsBase(TypedDict):
@@ -106,6 +106,6 @@ class EGIParamsSubsetBoundingShape(EGIParamsSubsetBase):
     Boundingshape: str
 
 
-EGIParamsSubset = EGIParamsSubsetBbox | EGIParamsSubsetBoundingShape
+EGIParamsSubset = Union[EGIParamsSubsetBbox, EGIParamsSubsetBoundingShape]
 
-EGISpecificRequiredParams = EGISpecificParamsSearch | EGISpecificParamsDownload
+EGISpecificRequiredParams = Union[EGISpecificParamsSearch, EGISpecificParamsDownload]