56 lines
1.8 KiB
Python
56 lines
1.8 KiB
Python
# vim: tabstop=4 shiftwidth=4 softtabstop=4
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# Copyright (C) 2012 Yahoo! Inc. All Rights Reserved.
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# Copyright (C) 2012 New Dream Network, LLC (DreamHost) 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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import sys
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def partition(fullname):
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"""
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The name should be in dotted.path:ClassName syntax.
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"""
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if ':' not in fullname:
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raise ValueError('Invalid entry point specifier %r' % fullname)
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(module_name, _, classname) = fullname.partition(':')
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return (module_name, classname)
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def import_entry_point(fullname):
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"""
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Given a name import the class and return it.
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"""
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(module_name, classname) = partition(fullname)
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try:
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module = __import__(module_name)
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for submodule in module_name.split('.')[1:]:
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module = getattr(module, submodule)
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cls = getattr(module, classname)
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except (ImportError, AttributeError) as err:
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raise RuntimeError('Could not load entry point %s: %s' %
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(fullname, err))
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return cls
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def import_module(module_name, quiet=True):
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try:
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__import__(module_name)
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return sys.modules.get(module_name, None)
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except ImportError:
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if quiet:
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return None
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else:
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raise
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