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45 lines
1.6 KiB
Python
45 lines
1.6 KiB
Python
from functools import partial
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from importlib import import_module
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def import_string(dotted_path, dotted_attributes=None):
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"""
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Import a dotted module path and return the attribute/class designated by the
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last name in the path. When a dotted attribute path is also provided, the
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dotted attribute path would be applied to the attribute/class retrieved from
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the first step, and return the corresponding value designated by the
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attribute path. Raise ImportError if the import failed.
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"""
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try:
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module_path, class_name = dotted_path.rsplit('.', 1)
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except ValueError:
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raise ImportError("%s doesn't look like a module path" % dotted_path)
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module = import_module(module_path)
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try:
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result = getattr(module, class_name)
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except AttributeError:
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raise ImportError('Module "%s" does not define a "%s" attribute/class' % (
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module_path, class_name)
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)
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if not dotted_attributes:
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return result
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else:
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attributes = dotted_attributes.split('.')
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traveled_attributes = []
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try:
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for attribute in attributes:
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traveled_attributes.append(attribute)
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result = getattr(result, attribute)
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return result
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except AttributeError:
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raise ImportError('Module "%s" does not define a "%s" attribute inside attribute/class "%s"' % (
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module_path, '.'.join(traveled_attributes), class_name
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))
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def lazy_import(dotted_path, dotted_attributes=None):
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return partial(import_string, dotted_path, dotted_attributes)
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