flask学习：如何从config里载入配置

代码如下：

1.main.py

from flask import Flask
from config import DevConfig

app=Flask(__name__)

app.config.from_object(DevConfig)

@app.route('/')
def home():
    return "<h1>Hello Wcf!</h1>"


if __name__=='__main__':
    app.run()

 

2.config.py

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class Config(object):     pass   class ProdConfig(Config):     pass   class DevConfig(Config):     DEBUG=True

　想了解一下，app.config.from_boject...是如何运作的，跟踪到源代码中：

在flask的config.py中，有一个方法，是：

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def from_object(self, obj):     """Updates the values from the given object.  An object can be of one     of the following two types:       -   a string: in this case the object with that name will be imported     -   an actual object reference: that object is used directly       Objects are usually either modules or classes. :meth:`from_object`     loads only the uppercase attributes of the module/class. A ``dict``     object will not work with :meth:`from_object` because the keys of a     ``dict`` are not attributes of the ``dict`` class.       Example of module-based configuration::           app.config.from_object('yourapplication.default_config')         from yourapplication import default_config         app.config.from_object(default_config)       You should not use this function to load the actual configuration but     rather configuration defaults.  The actual config should be loaded     with :meth:`from_pyfile` and ideally from a location not within the     package because the package might be installed system wide.       See :ref:`config-dev-prod` for an example of class-based configuration     using :meth:`from_object`.       :param obj: an import name or object     """     if isinstance(obj, string_types):         obj = import_string(obj)     for key in dir(obj):         if key.isupper():             self[key] = getattr(obj, key)

　　这里，用到了一个dir的python自带的函数，是其代码的关键，那么，dir是干嘛用的么？

在python中任何东西都是对像，一种数据类型，一个模块等，都有自己的属性和方法，除了常用方法外，其它的你不需要全部记住它，交给dir()函数就好了。

dir()函数操作方法很简单，只需要把你想要查询和对像添写到( )括号中就可以使用了。