Tools, FAQ, Tutorials:
'list' Values are Objects
Are "list" values objects in Python?
✍: FYIcenter.com
Yes, "list" values are objects in Python.
In fact, all data values in Python are objects.
In Python, "list" is defined as an object class with the following interesting properties, constructors, and methods:
list.__doc__ - Property holding a short description of "list" objects.
list.__new__() - Constructor returning a "list" object. It can be invoked as list(). For example:
>>> list.__new__(list)
[]
>>> list()
[]
>>> list(("Age", 25))
['Age', 25]
>>> list(["Age", 25])
['Age', 25]
>>> list("FYIcenter.com")
['F', 'Y', 'I', 'c', 'e', 'n', 't', 'e', 'r', '.', 'c', 'o', 'm']
list.__getitem__() - Instance method for the [] operation, returning item of the list at the given position. For example:
>>> ['Age', 25].__getitem__(1) 25 >>> ['Age', 25][1] 25 >>> (['Age', 25])[1] 25
list.__len__() - Instance method returning the number of items in the list. It can be invoked as len(list). For example:
>>> ['Age', 25].__len__() 2 >>> len(['Age', 25]) 2
list.__sizeof__() - Instance method returning the size of the list in memory, in bytes. For example:
>>> ['Age', 25].__sizeof__() 28 >>> [].__sizeof__() 20
list.append() - Instance method appending a new value to the end of the list. For example:
>>> a = ['Age', 25] >>> a.append(["Name","Joe"]) >>> a ['Age', 25, ['Name', 'Joe']] >>>
You can use the dir(list) function to see all members of the "list" class:
>>> dir(list) ['__add__', '__class__', '__contains__', '__delattr__', '__delitem__', '__dir__' , '__doc__', '__eq__', '__format__', '__ge__', '__getattribute__', '__getitem__' , '__gt__', '__hash__', '__iadd__', '__imul__', '__init__', '__init_subclass__', '__iter__', '__le__', '__len__', '__lt__', '__mul__', '__ne__', '__new__', '__r educe__', '__reduce_ex__', '__repr__', '__reversed__', '__rmul__', '__setattr__' , '__setitem__', '__sizeof__', '__str__', '__subclasshook__', 'append', 'clear', 'copy', 'count', 'extend', 'index', 'insert', 'pop', 'remove', 'reverse', 'sort ']
2022-12-03, ∼1917🔥, 0💬
Popular Posts:
How to use "link" command tool to link objet files? If you have object files previously compiled by ...
Where can I download the EPUB 2.0 sample book "The Metamorphosis" by Franz Kafka? You can following ...
How to use the "forward-request" Policy Statement to call the backend service for an Azure API servi...
How to decode the id_token value received from Google OpenID Connect authentication response? Accord...
How to detect errors occurred in the json_decode() call? You can use the following two functions to ...