Why does the Flask source code use property? some of the code is not decorated, and some are used again?

recently I saw a piece of source code in flask, and I saw that in a class definition, some attributes were written in the form of property decorator, while others were instantiated in property. What"s the use of this? I really don"t understand why? 

    def _get_static_url_path(self):
        if self._static_url_path is not None:
            return self._static_url_path

        if self.static_folder is not None:
            return "/" + os.path.basename(self.static_folder)

    def _set_static_url_path(self, value):
        self._static_url_path = value

    static_url_path = property(
        _get_static_url_path, _set_static_url_path,
        doc="The URL prefix that the static route will be registered for."
    )
    del _get_static_url_path, _set_static_url_path

    @property
    def has_static_folder(self):
        """This is ``True`` if the package bound object"s container has a
        folder for static files.

        .. versionadded:: 0.5
        """
        return self.static_folder is not None
Python
Mar.22,2021

different ways lead to the same goal. To be exact, the effect of the two is the same.

Let me guess, I guess it's a matter of personal style (but everyone's style changes over time). If you don't believe it, look ~

there is another situation, that is, when you only need to process a certain value, the way of annotations is relatively simple and fast.

clipboard.png

Previous: Hotlink protection-how to prevent fake referer from crawling audio and pictures in the page?

Next: What is the difference in the number of milliseconds returned by the Date object in js? For example, the difference between Date.now and Date.prototype.valueOf ()?

css mysql arrays josn react html typescript webpack npm sass R objective-c .net sql-server jquery python-3.x angularjs django angular excel regex iphone ajax linux xml pandas vba spring database wordpress string wpf xcode windows bash postgresql oracle multithreading eclipse list firebase algorithm macos forms image scala visual-studio azure bootstrap spring-boot react-native python-2.7 docker performance function winforms matlab powershell apache dataframe api sqlite numpy rest shell selenium flutter dart maven loops qt swing android-studio csv express file class tensorflow sorting codeigniter perl
© 2021 CodesHelper
Advertising Contact us About us
Menu