Understanding Python Dictionaries

Which of the following statements is incorrect for python dictionaries?

Dictionaries are mutable

dict() is a built-in function to create dictionaries in python

Dictionary do not have a relative ordering of positions

Dictionaries cannot contain objects of arbitrary type

The incorrect statement for Python dictionaries is: "Dictionaries cannot contain objects of arbitrary type."

Explanation:

Python dictionaries are data structures that store key-value pairs. They are mutable, meaning you can modify them after they are created. The dict() function is a built-in function in Python that allows you to create dictionaries.

Dictionaries in Python do not have a relative ordering of positions, which means the elements in a dictionary are not stored in a specific order. The order of retrieval of items from a dictionary is not guaranteed to be the same as the order of insertion.

Contrary to the incorrect statement, Python dictionaries can contain objects of arbitrary type. The keys in a dictionary must be hashable, which means they should have a hash value that remains constant during their lifetime. The values in a dictionary can be of any type, including built-in data types (such as integers, strings, lists) and user-defined objects.

Therefore, the correct statement should be: "Dictionaries can contain objects of arbitrary type."

To summarize, the incorrect statement among the given options is that dictionaries cannot contain objects of arbitrary type.