Python3基础 __delattr__ 在一个属性被删除时的行为

 

•        Python : 3.7.0
•          OS : Ubuntu 18.04.1 LTS
•         IDE : PyCharm 2018.2.4
•       Conda : 4.5.11
•    typesetting : Markdown

 

code

"""
@Author : 行初心
@Date   : 18-9-23
@Blog   : www.cnblogs.com/xingchuxin
@Gitee  : gitee.com/zhichengjiu
"""


class MyClass:

    def __init__(self, work, score):
        self.work = work
        self.score = score

    def __delattr__(self, name):
        print("你正在删除一个属性")
        return super().__delattr__(name)


def main():
    test = MyClass(work="math", score=100)

    # 删除work属性
    del test.work

    # work属性删除,score属性还在
    print(test.score)

    try:
        print(test.work)
    except AttributeError as reason:
        print(reason)


if __name__ == '__main__':
    main()

 

result

/home/coder/anaconda3/envs/py37/bin/python /home/coder/PycharmProjects/oop/demo.py
你正在删除一个属性
100
'MyClass' object has no attribute 'work'

Process finished with exit code 0

 

resource

• [文档] docs.python.org/3
• [规范] www.python.org/dev/peps/pep-0008
• [规范] zh-google-styleguide.readthedocs.io/en/latest/google-python-styleguide/python_language_rules
• [源码] www.python.org/downloads/source
• [ PEP ] www.python.org/dev/peps
• [平台] www.cnblogs.com
• [平台] gitee.com

 

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Python具有开源、跨平台、解释型、交互式等特性，值得学习。
Python的设计哲学：优雅，明确，简单。提倡用一种方法，最好是只有一种方法来做一件事。
代码的书写要遵守规范，这样有助于沟通和理解。
每种语言都有独特的思想，初学者需要转变思维、踏实践行、坚持积累。