WHAT TO DO WITH EXCEPTIONS? what to do when encounter an error? what value to choose? WHERE TO USE ASSERTIONS? For information about citing these materials or our Terms of …

Python developers may encounter the “AttributeError: module ‘collections’ has no attribute” message when trying to access a non-existent attribute in the collections module. This article …

Explanation: The __setitem__() method in a Python class is used to enable setting of individual elements of the object. This method is called when you attempt to assign a value to an …

To cause an error, you simply raise the name of a class that is derived from BaseException. In the next section on iterators, we’ll see how the built-in StopIteration class is used to signal the end …

StandardError AssertionError AttributeError Argument has wrong type (e.g. float([1])) Argument has wrong value

# 7.py # AttributeError exception: incorrect use of methods of a class or data type. # In this example the class Car has only defined the method move, but the # program tries execute the …

If self is an instance of cls, raises an AttributeError, to avoid a double lookup. This function is intended to be called from __getattr__, and so should not be called if name is an attribute of self.