56 lines
2.1 KiB
Python
56 lines
2.1 KiB
Python
# Copyright (c) 2010, R. Tyler Ballance
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#
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# Permission is hereby granted, free of charge, to any person obtaining a copy
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# of this software and associated documentation files (the "Software"), to
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# deal
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# in the Software without restriction, including without limitation the rights
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# to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
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# copies of the Software, and to permit persons to whom the Software is
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# furnished to do so, subject to the following conditions:
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# The above copyright notice and this permission notice shall be included in
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# all copies or substantial portions of the Software.
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#
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# THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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# IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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# FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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# AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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# LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
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# FROM,
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# OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
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# THE SOFTWARE.
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def named(name):
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"""Return an object given its name.
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The name uses a module-like syntax, eg::
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os.path.join
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or::
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mulib.mu.Resource
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"""
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toimport = name
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obj = None
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import_err_strings = []
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while toimport:
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try:
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obj = __import__(toimport)
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break
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except ImportError, err:
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# print 'Import error on %s: %s' % (toimport, err) # debugging spam
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import_err_strings.append(err.__str__())
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toimport = '.'.join(toimport.split('.')[:-1])
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if obj is None:
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raise ImportError('%s could not be imported. Import errors: %r' % (name, import_err_strings))
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for seg in name.split('.')[1:]:
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try:
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obj = getattr(obj, seg)
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except AttributeError:
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dirobj = dir(obj)
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dirobj.sort()
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raise AttributeError('attribute %r missing from %r (%r) %r. Import errors: %r' % (
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seg, obj, dirobj, name, import_err_strings))
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return obj
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