werkzeug.utils.import_string的用处

def from_object(self, obj):
    if isinstance(obj, string_types):
       obj = import_string(obj)
   for key in dir(obj):
     if key.isupper():
         self[key] = getattr(obj, key)

    在flask app.py的源代码中看到import_string，往上看是出自werkzeug.utils，看了下文档：

werkzeug.utils.import_string(import_name, silent=False)

Imports an object based on a string. This is useful if you want touse import paths as endpoints or something similar. An import path canbe specified either in dotted notation (xml.sax.saxutils.escape)or with a colon as object delimiter (xml.sax.saxutils:escape).

If silent is True the return value will be None if the import fails.

Parameters:	import_name – the dotted name for the object to import. silent – if set to True import errors are ignored andNone is returned instead.
Returns:	imported object

    用cmd测试了下werkzeug.utils.import_string()就是用来导入函数的

>>> import_string('config.TestingConfig')
<class config.TestingConfig at 0x0000000002A8F708>