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What exactly is <collection>?
Collection is my name for an iterable object. An iterable object in Python is any object that has at least one of iter() and getitem() special methods defined. By convention, <object>.__iter__() should return an iterator of object's items and <object>.__getitem__(<index>) an item at that index. I chose not to use the name iterable because it sounds scarier and more vague than collection, even though it has a precise definition.
To make matters a bit more confusing, an abstract base class called Iterable doesn't fully follow this definition. An expression instanceof(<object>, collections.abc.Iterable) only checks whether an object has iter() special method, disregarding the getitem().
- Although collection has no definition in Python's glossary, there exists a Collection abstract base class. Expression instanceof(<object>, collections.abc.Collection) returns 'True' for any object that has len(), iter() and contains() special methods defined. <object>.__len__() should return the number of elements and <object>.__contains__(<el>) should check if object contains the passed element.
+ Although collection has no definition in Python's glossary, there exists a Collection abstract base class. Expression instanceof(<object>, collections.abc.Collection) returns 'True' for any object that has len() and at least one of iter() and getitem() special methods defined. By convention, <object>.__len__() should return the number of object's elements.
What about PEP 8?