Python3 base Delattr Deletes a property of an object if the property does not exist, throws an exception

Town Field Poem:
Cheng listens to the Tathagata language, the world name and benefit of Dayton. Be willing to do the Tibetan apostles, the broad show is by Sanfu mention.
I would like to do what I learned, to achieve a conscience blog. May all the Yimeimei, reproduce the wisdom of the body.
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Code

Class A:    #属性    num=0a=a () introduction= ' The property you are accessing does not exist ' print (GetAttr (A, ' haha ', introduction)) SetAttr (A, ' haha ', 1 Print (GetAttr (A, ' haha ')) delattr (A, ' haha ') print (GetAttr (A, ' haha ', introduction)) Print ("------------------------ ----------------") introduction= ' the property you are accessing does not exist ' print (GetAttr (A, ' num ', Introduction)) Delattr (A, ' num ') #num是一个静态变量, All instances can be accessed. All to delete, you must remove delattr (A, ' num ') from the root #删除不了属性num, because Num is not self.num.

Result

============= restart:c:\users\administrator\desktop\mycode.py ============= The property you are accessing does not exist 1 the property you are accessing does not exist----------------------------------------0Traceback (most recent call last):  File "C:\Users \administrator\desktop\mycode.py ", line A, in <module>    

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The essence of the blog, in the technical part, more in the town yard a poem. Python version 3.5, System Windows7.
Python is a good language and deserves to be studied hard. I am following the small Turtle Video tutorial to learn, recommended.
I am a novice, so if the content of the blog can be improved, or even the wrong place, please leave a comment, I will try to correct, strive to achieve a conscience blog.
Note: This article is only as a scientific research study, if I inadvertently violated your rights and interests, please be sure to timely inform, I will make corrections.

Python3 base Delattr Deletes a property of an object if the property does not exist, throws an exception