Python3基础 getattr 获取对象的指定属性值

Posted 2021-01-08 xingchuxin

?

•                    python : 3.7.0
•                           OS : Ubuntu 18.04.1 LTS
  
•                          IDE : PyCharm 2018.2.4
•                      conda : 4.5.11
•            type setting : Markdown

?

code

[email protected]:~$ source activate xingchuxin
(xingchuxin) [email protected]:~$ ipython
Python 3.7.0 (default, Jun 28 2018, 13:15:42) 
Type ‘copyright‘, ‘credits‘ or ‘license‘ for more information
IPython 6.5.0 -- An enhanced Interactive Python. Type ‘?‘ for help.

In [1]: class MyClass:
   ...:     # 类属性
   ...:     num = 0
   ...: 
   ...: 

In [2]: getattr(MyClass,‘num‘)  # 属性的名字是字符串
Out[2]: 0

In [3]: # 还可以进行加说明，防止抛异常

In [4]: introduction = ‘你所访问的属性不存在‘

In [5]: print(getattr(MyClass, ‘name‘, introduction))
你所访问的属性不存在

In [6]: # 如果你访问的属性不存在，会抛异常

In [7]: getattr(MyClass, ‘name‘)
---------------------------------------------------------------------------
AttributeError                            Traceback (most recent call last)
<ipython-input-7-4454b72514b0> in <module>()
----> 1 getattr(MyClass, ‘name‘)

AttributeError: type object ‘MyClass‘ has no attribute ‘name‘

In [8]: exit
(xingchuxin) [email protected]:~$ source deactivate xingchuxin
[email protected]:~$ 

?

resource

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

?

tips

行初心 会根据所学的知识，对博文进行更新。
该博文地址：https://www.cnblogs.com/xingchuxin/p/9695494.html

?

---

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。