Update usage of typing dict and list

ixmp/backend/jdbc.py

@@ -10,7 +10,7 @@
 from functools import lru_cache
 from pathlib import Path, PurePosixPath
 from types import SimpleNamespace
-from typing import Generator, List, Mapping, Optional
+from typing import Generator, Mapping, Optional
 from weakref import WeakKeyDictionary
 
 import jpype
@@ -1290,7 +1290,7 @@ def start_jvm(jvmargs=None):
 # Conversion methods
 
 
-def to_pylist(jlist) -> List:
+def to_pylist(jlist) -> list:
     """Convert Java list types to :class:`list`."""
     try:
         return list(jlist[:])

ixmp/model/base.py

@@ -2,7 +2,7 @@
 import os
 import re
 from abc import ABC, abstractmethod
-from typing import TYPE_CHECKING, Dict, Mapping
+from typing import TYPE_CHECKING, Mapping
 
 from ixmp.util import maybe_check_out, maybe_commit
 
@@ -85,7 +85,7 @@ def initialize(cls, scenario):
         log.debug(f"No initialization for {repr(scenario.scheme)}-scheme Scenario")
 
     @classmethod
-    def initialize_items(cls, scenario: "Scenario", items: Mapping[str, Dict]) -> None:
+    def initialize_items(cls, scenario: "Scenario", items: Mapping[str, dict]) -> None:
         """Helper for :meth:`initialize`.
 
         All of the `items` are added to `scenario`. Existing items are not modified.