etree.py 文件源码

def getETreeModule(ElementTreeImplementation):
    name = "_" + ElementTreeImplementation.__name__+"builder"
    if name in moduleCache:
        return moduleCache[name]
    else:
        mod = ModuleType("_" + ElementTreeImplementation.__name__+"builder")
        objs = getETreeBuilder(ElementTreeImplementation)
        mod.__dict__.update(objs)
        moduleCache[name] = mod
        return mod