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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())
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