In python, what is contained in the info property of a module object?
I'm looking into creating a Plugin structure for a program and making it so even the core library is treated as plugins. in my research I came across this code that is dynamically importing modules.
def __initialize_def(self, module): """Attempt to load the definition""" # Import works the same for py files and package modules so strip! if module.endswith(".py"): name = module [:-3] else: name = module # Do the actual import __import__(name) definition = sys.modules[name] # Add the definition only if the class is available if hasattr(definition, definition.info["class"]): self.definitions[definition.info["name"]] = definition logging.info("Loaded %s" % name)
I have tried to understand what this code is doing and I've succeeded to a point. However, I simply can't understand the latter part of the code, specifically these two lines:
if hasattr(definition, definition.info["class"]): self.definitions[definition.info["name"]] = definition
I can't figure out what definition.info["<key>"] is referring to.
What is this .info dictionary and what does it hold? Is it common to all Python objects or only module objects? What is it useful for?
py> import sys,os py> sys.modules["os"].info["class"] Traceback (most recent call last): File "<stdin>", line 1, in <module> AttributeError: 'module' object has no attribute 'info'
So this info attribute must be specific to modules that can be used as plugins in this program.