在构造函数中设置字典（python）

发布于 2024-10-20 05:11:35 字数 574 浏览 3 评论 0原文

嘿，我是一个Python菜鸟，我试图在类的构造函数中设置一个字典，但是，每当我尝试访问一个元素时，它都会返回 None 。这是我的代码

class GoogleApp:

  def __init__(self, path):
    self.name = "Google App"
    self.description = "Creates an new google app project."
    self.title = None
    self.path = path
    self.pre_defined_macros = {
      '_NAME': self.name , 
      '_DESCRIPTION': self.description,
      '_TITLE': "Shoutout",
      '_BASE_PATH': self.path,
      '_PATH': lambda: os.path.join(self.path, self.title)
    }

现在，每当我尝试从其他方法访问 self.pre_define_macros['_TITLE'] 时，它都会返回 None 。

原文

Hey I am a python rookie and I am trying to setup a dict in the constructor of a class how ever, whenever I try to access an element, it returns None. Here is my code

class GoogleApp:

  def __init__(self, path):
    self.name = "Google App"
    self.description = "Creates an new google app project."
    self.title = None
    self.path = path
    self.pre_defined_macros = {
      '_NAME': self.name , 
      '_DESCRIPTION': self.description,
      '_TITLE': "Shoutout",
      '_BASE_PATH': self.path,
      '_PATH': lambda: os.path.join(self.path, self.title)
    }

Now whenever I try to access self.pre_defined_macros['_TITLE'] from some other method it returns None.

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↘人皮目录ツ 2024-10-27 05:11:35

您可以发布示例代码吗？

我问这个是因为我不确定你想做什么。 .pre_define_macros['_TITLE'] 在我测试时工作正常。

>>> class GoogleApp:

  def __init__(self, path):
    self.name = "Google App"
    self.description = "Creates an new google app project."
    self.title = None
    self.path = path
    self.pre_defined_macros = {
      '_NAME': self.name , 
      '_DESCRIPTION': self.description,
      '_TITLE': "Shoutout",
      '_BASE_PATH': self.path,
      '_PATH': lambda: os.path.join(self.path, self.title)
    }


>>> f  = GoogleApp('foo')
>>> f.pre_defined_macros['_TITLE']
'Shoutout'
>>>

我还尝试从另一种方法访问 pre_defined_macros 。就像这样：

>>> class GoogleApp:
    def __init__(self, path):
        # Your original code here.
    def get_title(self):
        return self.pre_defined_macros['_TITLE']


>>> f  = GoogleApp('foo')
>>> f.get_title()
'Shoutout'
>>>

Can you post sample code?

I ask this because I'm not sure what you are trying to do. <instance>.pre_defined_macros['_TITLE'] worked fine when I tested it.

>>> class GoogleApp:

  def __init__(self, path):
    self.name = "Google App"
    self.description = "Creates an new google app project."
    self.title = None
    self.path = path
    self.pre_defined_macros = {
      '_NAME': self.name , 
      '_DESCRIPTION': self.description,
      '_TITLE': "Shoutout",
      '_BASE_PATH': self.path,
      '_PATH': lambda: os.path.join(self.path, self.title)
    }


>>> f  = GoogleApp('foo')
>>> f.pre_defined_macros['_TITLE']
'Shoutout'
>>>

I also tried accessing pre_defined_macros from another method. Like so:

>>> class GoogleApp:
    def __init__(self, path):
        # Your original code here.
    def get_title(self):
        return self.pre_defined_macros['_TITLE']


>>> f  = GoogleApp('foo')
>>> f.get_title()
'Shoutout'
>>>

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