Python built-in functions (14) -- delattr, pythondelattr

Python built-in functions (14) -- delattr, pythondelattr

English document:

delattr( Object, Name)

This is a relative setattr(). The arguments are an object and a string. the string must be the name of one of the object's attributes. the function deletes the named attribute, provided the object allows it. for example, delattr(x, 'foobar')Is equivalent del x.foobar.

Note:

　　

1. The function is used to delete the attribute of the specified name of the specified object, which is opposite to the setattr function.

# Define class A >>> class A: def _ init _ (self, name): self. name = name def sayHello (self): print ('hello', self. name) # test attributes and Methods>. name 'wheat '>. sayHello () hello wheat # Delete attribute >>> delattr (a, 'name') >>>. nameTraceback (most recent call last): File "<pyshell #47>", line 1, in <module>. nameAttributeError: 'A 'object has no attribute 'name'

2. If the property does not exist, an error is returned.

>>>. Name # The property name has been deleted. Traceback (most recent call last): File "<pyshell #47>", line 1, in <module>. nameAttributeError: 'A' object has no attribute 'name' >>> delattr (A, 'name') # The error Traceback (most recent call last) is returned when you delete the file ): file "<pyshell #48>", line 1, in <module> delattr (a, 'name') AttributeError: name

3. Methods of objects cannot be deleted.

>>>. SayHello <bound method. sayHello of <__ main __. A object at 0x03F014B0 >>>> delattr (a, 'sayhel') # The method Traceback (most recent call last) cannot be deleted: File "<pyshell #50> ", line 1, in <module> delattr (a, 'sayhel') AttributeError: sayHello >>>