delattr() function takes an object and an attribute name as arguments and removes the attribute from the object. The call
delattr(object, 'attribute') is semantically identical to
This article shows you how to use Python’s built-in
Learn by example! Here’s an example on how to use the
delattr() built-in function.
Car object with one attribute
# Define class with one attribute class Car: def __init__(self): self.speed = 100 # Create object porsche = Car()
Print the attribute
# What's the value for attribute speed? print(porsche.speed) # 100
delattr(porsche, speed) to remove the attribute
speed from the object
# Remove the attribute speed from porsche delattr(porsche, 'speed')
After removing the attribute, it cannot be accessed anymore:
# 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' '''
delattr() object has the following syntax:
delattr(object, attribute) # Removes attribute from object
|Arguments||The object from which the attribute should be removed|
|The attribute to be removed|
|Return Value||Returns Nothing. If the attribute doesn’t exist, the method does nothing.|
Interactive Shell Exercise: Understanding delattr()
Consider the following interactive code:
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
delattr() is to use the
del keyword that is also built-in.
delattr(object, 'attribute') is semantically identical to the
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.
# 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:
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'
getattr()function returns the value of an attribute.
setattr()function changes the value of an attribute.
hasattr()function checks if an attribute exists.
delattr()function deletes an existing attribute.
delattr() function takes an object and an attribute name as arguments and removes the attribute from the object.
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