[Tut] Python delattr()

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Python delattr()

Python’s built-in

Code:

delattr()

function takes an object and an attribute name as arguments and removes the attribute from the object. The call

Code:

delattr(object, 'attribute')

is semantically identical to

Code:

del object.attribute

.



This article shows you how to use Python’s built-in

Code:

delattr()

function.

Usage

Learn by example! Here’s an example on how to use the

Code:

delattr()

built-in function.

Create a

Code:

Car

object with one attribute

Code:

speed

.

Code:

# Define class with one attribute class Car: def __init__(self): self.speed = 100 # Create object porsche = Car()

Printthe attribute

Code:

speed

:

Code:

# What's the value for attribute speed? print(porsche.speed) # 100

Use

Code:

delattr(porsche, speed)

to remove the attribute

Code:

speed

from the object

Code:

porsche

.

Code:

# Remove the attribute speed from porsche delattr(porsche, 'speed')

After removing the attribute, it cannot be accessed anymore:

Code:

# Does this still work? print(porsche.speed) # No: ''' Traceback (most recent call last): File "C:\Users\xcent\Desktop\Finxter\Blog\HowToConvertBooleanToStringPython\code.py", line 18, in <module> print(porsche.speed) AttributeError: 'Car' object has no attribute 'speed' '''

Syntax delattr()

The

Code:

delattr()

object has the following syntax:

Code:

Syntax: delattr(object, attribute) # Removes attribute from object

Arguments |

Code:

object

|
The object from which the attribute should be removed

|

Code:

string

|
The attribute to be removed

Return Value |

Code:

None

|
Returns Nothing. If the attribute doesn’t exist, the method does nothing.

Interactive Shell Exercise: Understanding delattr()

Consider the following interactive code:

https://trinket.io/embed/python/4045c3a543

Exercise: Does the code work? If yes, run it! If not, fix the bug!

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Python del vs delattr()

The alternative to Python’s built-in

Code:

delattr()

is to use the

Code:

del

keyword that is also built-in.

The

Code:

delattr(object, 'attribute')

is semantically identical to the

Code:

del object.attribute

call. Note that in the first case, the attribute is given as a string, while in the second case, the attribute is given as a normal attribute name.

Code:

# Define class with one attribute class Car: def __init__(self): self.speed = 100 # Create object porsche = Car() # What's the value for attribute speed? print(porsche.speed) # Remove the attribute speed from porsche del porsche.speed # Does this still work? print(porsche.speed)

The output is the same:

Code:

100 Traceback (most recent call last): File "C:\Users\xcent\Desktop\Finxter\Blog\HowToConvertBooleanToStringPython\code.py", line 17, in <module> print(porsche.speed) AttributeError: 'Car' object has no attribute 'speed'

Related Functions

• The
  Code:

  getattr()
  function returns the value of an attribute.
  
  
• The
  Code:

  hasattr()
  function checks if an attribute exists.
  
  
• The
  Code:

  setattr()
  function sets the value of an attribute.
  

Summary

Python’s built-in

Code:

delattr()

function takes an object and an attribute name as arguments and removes the attribute from the object.

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