Python3基础 getattr 获取对象的指定属性值

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

code

xcx@xcx-PC:~$ source activate xingchuxin
(xingchuxin) xcx@xcx-PC:~$ 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) xcx@xcx-PC:~$ source deactivate xingchuxin
xcx@xcx-PC:~$ 

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

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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。

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