Cyril Roelandt
3c16d23293
This will help with porting to Python 3. List of merged commits: 04a1abe59ac39890f57d2eed57d3d1b12bb5d757 12bcdb71ffbe9ee1688beed1f0ddb0c198822682 2cfc1a78d8063cf20083cf7df796d730a576551c 302c7c80b503b8090e8118e45061e8903b5339a9 35dc1d797209f0b22ff3ed3b8a6059961563daee 3b248dd683d83fd564f740ea58565d1bc0bd6cc0 4246ce0f373aa8f8955a99a3b6288a32547d8e80 6650435004af149284f0badb2bb8c89005cc7dab 6d55e26aa379fd043c66d1b7c5bf59a1b4a54632 71c22e9b2fbf04fc91a7343d3de0e0c7f10e3988 84d461e859e4b1eb1a00b9b141df61c37da84d2d 8575d87af49ea276341908f83c8c51db13afca44 885828af2297b20a3f9f8e8f6647f7291f784743 8b2b0b743e84ceed7841cf470afed6a5da8e1d07 9f1e7eb4112067423f845bd99ec52256db1c8bb1 bd5dad97585208ea5e86d636f3dc3b669e361a41 be81d6ba70152e5cdd7e8e9d789b9733c6ff527f bec3a5eb8157c0c552c6392ccf0da342ffb8da26 c178e567cb48d3bc67dcf06bcbb4c6a97df9f434 Closes-Bug: 1289690 Change-Id: I39fa5e3fa46ffe9448b381ed54759cb4270cc898
74 lines
2.3 KiB
Python
74 lines
2.3 KiB
Python
# Copyright 2011 OpenStack Foundation.
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# All Rights Reserved.
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#
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# Licensed under the Apache License, Version 2.0 (the "License"); you may
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# not use this file except in compliance with the License. You may obtain
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# a copy of the License at
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#
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# http://www.apache.org/licenses/LICENSE-2.0
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#
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# Unless required by applicable law or agreed to in writing, software
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# distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
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# WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
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# License for the specific language governing permissions and limitations
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# under the License.
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"""
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Import related utilities and helper functions.
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"""
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import sys
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import traceback
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def import_class(import_str):
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"""Returns a class from a string including module and class."""
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mod_str, _sep, class_str = import_str.rpartition('.')
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try:
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__import__(mod_str)
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return getattr(sys.modules[mod_str], class_str)
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except (ValueError, AttributeError):
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raise ImportError('Class %s cannot be found (%s)' %
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(class_str,
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traceback.format_exception(*sys.exc_info())))
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def import_object(import_str, *args, **kwargs):
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"""Import a class and return an instance of it."""
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return import_class(import_str)(*args, **kwargs)
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def import_object_ns(name_space, import_str, *args, **kwargs):
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"""Tries to import object from default namespace.
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Imports a class and return an instance of it, first by trying
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to find the class in a default namespace, then failing back to
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a full path if not found in the default namespace.
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"""
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import_value = "%s.%s" % (name_space, import_str)
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try:
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return import_class(import_value)(*args, **kwargs)
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except ImportError:
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return import_class(import_str)(*args, **kwargs)
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def import_module(import_str):
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"""Import a module."""
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__import__(import_str)
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return sys.modules[import_str]
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def import_versioned_module(version, submodule=None):
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module = 'glanceclient.v%s' % version
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if submodule:
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module = '.'.join((module, submodule))
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return import_module(module)
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def try_import(import_str, default=None):
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"""Try to import a module and if it fails return default."""
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try:
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return import_module(import_str)
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except ImportError:
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return default
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