The Function Dir ()() in Python

This guide covers the function dir ()() in python with practical context and easy-to-follow details. Use it to understand the subject and apply the information confidently.

The Dir ()() Function Syntax in Python

dir([object])

Parameters of Function Dir ()()

Dir () Only returns results for one object.

Object: Object that gets Dir () Returns a list of attributes, optional parameters.

Return Value from Dir ()()

Dir () Will return a list of valid attributes of the object.

If the object has __dir __ () Function, when calling Dir Will return all the properties.

If the object does not have __dir __ () Next, the function will try to find through __dict __ () (if any). In this case, the list of properties returned from Dir () May be incomplete.

If you don't pass the object to Dir () , it will return the property within the current local scope.

Example 1: How does the dir () function work?

number = [1, 2, 3]
print(dir(number))

print('nGia tri tra ve tu dir() khong truyen object')
print(dir())

Run the program, the result is:

['__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']

Gia tri tra ve tu dir() khong truyen object
['__annotations__', '__builtins__', '__doc__', '__file__', '__loader__', '__name__', '__package__', 
 '__spec__', 'number']

Example 2: dir () with user defined object

class Person:
def __dir__(self):
return ['age', 'name', 'salary']

teacher = Person()
print(dir(teacher))

Run the program, the result is:

['age', 'name', 'salary']

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