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  • Python3基础 list dict set 均为unhashable type

    •        Python : 3.7.3
    •          OS : Ubuntu 18.04.2 LTS
    •         IDE : pycharm-community-2019.1.3
    •       Conda : 4.7.5
    •    typesetting : Markdown

    code

    coder@ubuntu:~$ source activate py37
    (py37) coder@ubuntu:~$ ipython
    Python 3.7.3 (default, Mar 27 2019, 22:11:17) 
    Type 'copyright', 'credits' or 'license' for more information
    IPython 7.5.0 -- An enhanced Interactive Python. Type '?' for help.
    
    In [1]: hash(list())                                                            
    ---------------------------------------------------------------------------
    TypeError                                 Traceback (most recent call last)
    <ipython-input-1-3e2eb619e4e4> in <module>
    ----> 1 hash(list())
    
    TypeError: unhashable type: 'list'
    
    In [2]: hash(dict())                                                            
    ---------------------------------------------------------------------------
    TypeError                                 Traceback (most recent call last)
    <ipython-input-2-7762fff637c6> in <module>
    ----> 1 hash(dict())
    
    TypeError: unhashable type: 'dict'
    
    In [3]: hash(set())                                                             
    ---------------------------------------------------------------------------
    TypeError                                 Traceback (most recent call last)
    <ipython-input-3-2699417ebeac> in <module>
    ----> 1 hash(set())
    
    TypeError: unhashable type: 'set'
    
    In [4]: exit                                                                    
    (py37) coder@ubuntu:~$ conda deactivate
    coder@ubuntu:~$ 
    
    

    source_code

    def hash(*args, **kwargs): # real signature unknown
        """
        Return the hash value for the given object.
        
        Two objects that compare equal must also have the same hash value, but the
        reverse is not necessarily true.
        """
        pass
    

    reference

    resource

    • [文档 - English] docs.python.org/3
    • [文档 - 中文] docs.python.org/zh-cn/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


    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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  • 原文地址:https://www.cnblogs.com/xingchuxin/p/11144136.html
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