# Copyright (C) The Arvados Authors. All rights reserved.
#
# SPDX-License-Identifier: Apache-2.0
+"""Arvados Python SDK
+
+This module provides the entire Python SDK for Arvados. The most useful modules
+include:
+
+* arvados.api - After you `import arvados`, you can call `arvados.api` as a
+ shortcut to the client constructor function `arvados.api.api`.
+
+* arvados.collection - The `arvados.collection.Collection` class provides a
+ high-level interface to read and write collections. It coordinates sending
+ data to and from Keep, and synchronizing updates with the collection object.
+
+* arvados.util - Utility functions to use mostly in conjunction with the API
+ client object and the results it returns.
+
+Other submodules provide lower-level functionality.
+"""
-from __future__ import print_function
-from __future__ import absolute_import
-from future import standard_library
-standard_library.install_aliases()
-from builtins import object
-import bz2
-import fcntl
-import hashlib
-import http.client
-import httplib2
-import json
import logging as stdliblog
import os
-import pprint
-import re
-import string
import sys
-import time
import types
-import zlib
-if sys.version_info >= (3, 0):
- from collections import UserDict
-else:
- from UserDict import UserDict
+from collections import UserDict
-from .api import api, api_from_config, http_cache
+from . import api, errors, util
+from .api import api_from_config, http_cache
from .collection import CollectionReader, CollectionWriter, ResumableCollectionWriter
from arvados.keep import *
from arvados.stream import *
from .arvfile import StreamFileReader
from .logging import log_format, log_date_format, log_handler
from .retry import RetryLoop
-import arvados.errors as errors
-import arvados.util as util
+
+# Previous versions of the PySDK used to say `from .api import api`. This
+# made it convenient to call the API client constructor, but difficult to
+# access the rest of the `arvados.api` module. The magic below fixes that
+# bug while retaining backwards compatibility: `arvados.api` is now the
+# module and you can import it normally, but we make that module callable so
+# all the existing code that says `arvados.api('v1', ...)` still works.
+class _CallableAPIModule(api.__class__):
+ __call__ = staticmethod(api.api)
+api.__class__ = _CallableAPIModule
# Override logging module pulled in via `from ... import *`
# so users can `import arvados.logging`.