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| from collections import defaultdict | |
| from importlib import import_module | |
| def autoimport_eval(term): | |
| ''' | |
| Used to evaluate an arbitrary command-line constructor specifying | |
| a class, with automatic import of global module names. | |
| ''' | |
| class DictNamespace(object): | |
| def __init__(self, d): | |
| self.__d__ = d | |
| def __getattr__(self, key): | |
| return self.__d__[key] | |
| class AutoImportDict(defaultdict): | |
| def __init__(self, wrapped=None, parent=None): | |
| super().__init__() | |
| self.wrapped = wrapped | |
| self.parent = parent | |
| def __missing__(self, key): | |
| if self.wrapped is not None: | |
| if key in self.wrapped: | |
| return self.wrapped[key] | |
| if self.parent is not None: | |
| key = self.parent + '.' + key | |
| if key in __builtins__: | |
| return __builtins__[key] | |
| mdl = import_module(key) | |
| # Return an AutoImportDict for any namespace packages | |
| if hasattr(mdl, '__path__'): # and not hasattr(mdl, '__file__'): | |
| return DictNamespace( | |
| AutoImportDict(wrapped=mdl.__dict__, parent=key)) | |
| return mdl | |
| return eval(term, {}, AutoImportDict()) | |