airflow module_loading 源码
airflow module_loading 代码
文件路径：/airflow/utils/module_loading.py
#
# Licensed to the Apache Software Foundation (ASF) under one
# or more contributor license agreements. See the NOTICE file
# distributed with this work for additional information
# regarding copyright ownership. The ASF licenses this file
# to you under the Apache License, Version 2.0 (the
# "License"); you may not use this file except in compliance
# with the License. You may obtain a copy of the License at
#
# http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing,
# software distributed under the License is distributed on an
# "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
# KIND, either express or implied. See the License for the
# specific language governing permissions and limitations
# under the License.
from __future__ import annotations
from importlib import import_module
def import_string(dotted_path):
"""
Import a dotted module path and return the attribute/class designated by the
last name in the path. Raise ImportError if the import failed.
"""
try:
module_path, class_name = dotted_path.rsplit('.', 1)
except ValueError:
raise ImportError(f"{dotted_path} doesn't look like a module path")
module = import_module(module_path)
try:
return getattr(module, class_name)
except AttributeError:
raise ImportError(f'Module "{module_path}" does not define a "{class_name}" attribute/class')
def as_importable_string(thing) -> str:
"""Convert an attribute/class to a string importable by ``import_string``."""
return f"{thing.__module__}.{thing.__name__}"
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