find(obj[, name][, module][, globs][, extraglobs])
Return a list of the DocTests that are defined by obj‘s docstring, or by any of its contained objects’ docstrings.
The optional argument name specifies the object’s name; this name will be used to construct names for the returned DocTests. If name is not specified, then obj.__name__ is used.
The optional parameter module is the module that contains the given object. If the module is not specified or is None, then the test finder will attempt