from types import ModuleType
 
def custom_mapping_module(name, mapping):
    class _CustomMappingModule(ModuleType):
        def __getattr__(self, name):
            return mapping[name]
        def __setattr__(self, name, value):
            mapping[name] = value
        def __delattr__(self, name):
            del mapping[name]
    return _CustomMappingModule(name)
 
from collections import ChainMap
 
c = ChainMap({'a': 1}, {'b': 2})
m = custom_mapping_module('foo', c)
print(m.a)
print(m.b)
del m.a
m.b = 3
print(m.b)
print(c)
print(m.__name__)
print(isinstance(m, ModuleType))

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