How to know all the operations which we can able to perform on list in python?

Question

While working with lists sometimes I got "list object has no attribute" type of results.So I think it's better to know which are the in-built operations we can perform on list.

Check out the python [documentation](https://docs.python.org/3/tutorial/datastructures.html) for list. — Paul Rooney, Aug 14 '18 at 04:56
`dir(list)` will enumerate all the methods available on `list` objects — Reblochon Masque, Aug 14 '18 at 04:57
The canonical way: reading [the documentation](https://docs.python.org/3/tutorial/datastructures.html). You can also directly inspect the object's documentation from the REPL: `help(list)`. — Amadan, Aug 14 '18 at 04:57
Possible duplicate of [Finding what methods a Python object has](https://stackoverflow.com/questions/34439/finding-what-methods-a-python-object-has) — Reblochon Masque, Aug 14 '18 at 06:00

Kaushik NP · Answer 1 · 2018-08-14T05:40:12.520

There are two primary ways to do this.

Use dir() to list all the attributes related to an object.

attempt to return a list of valid attributes for that object

>>> 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__', '__reduce__', 
    '__reduce_ex__', '__repr__', '__reversed__', '__rmul__', 
    '__setattr__', '__setitem__', '__sizeof__', '__str__', 
    '__subclasshook__', 'append', 'clear', 'copy', 'count', 'extend', 
    'index', 'insert', 'pop', 'remove', 'reverse', 'sort']

Use help() to get a consorted list of all the related functions, attributes etc.

Invoke the built-in help system

>>> help([])

Help on list object:

class list(object)
|  list() -> new empty list
|  list(iterable) -> new list initialized from iterable's items
|  
|  Methods defined here:
|  
|  __add__(self, value, /)
|      Return self+value.
|  
|  __contains__(self, key, /)
|      Return key in self.
|  
|  __delitem__(self, key, /)
|      Delete self[key].
|  
|  __eq__(self, value, /)
|      Return self==value.

... and so on

score 1 · Answer 2 · answered Aug 14 '18 at 05:03

You can run dir() on your list object to get the attributes.

dir([])

Will show:

 ['__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__',
 '__reduce__',
 '__reduce_ex__',
 '__repr__',
 '__reversed__',
 '__rmul__',
 '__setattr__',
 '__setitem__',
 '__sizeof__',
 '__str__',
 '__subclasshook__',
 'append',
 'clear',
 'copy',
 'count',
 'extend',
 'index',
 'insert',
 'pop',
 'remove',
 'reverse',
 'sort']

How to know all the operations which we can able to perform on list in python?

2 Answers2