首先,我认为我已经阅读了以下问题:
并且,我不觉得他们解决了我的用例。那就是说,这是我的问题:
如何从这样的配置文件中动态导入:
[imports]
/var/imports/foo.py = baz monkey
/var/imports/bar.py = ape
这样我就可以通过这样的RESTful接口调用已知对象。
# http://localhost/data?operation=get&class=baz&id=1
def handler(object):
def handle(self):
cls = instantiate(request.args["class"])
meth = request.args["operation"]
return getattr(cls,meth,request.args)
它可以在该类的实例上响应get()的结果。
答案 0 :(得分:2)
再次查看第二个链接。它已经提到了imp.load_source
:
import imp
# some sort of shared dict for everything imported
loaded = {}
def load(path, from_list):
# load the path
module = imp.load_source( "dummy", path)
for name in from_list:
# add the names
loaded[name] = getattr(module, name)
#lets say you have this:
data = "/var/imports/foo.py", ["baz"]
load(*data)
print loaded['baz'] # whatever foo.baz was
现在你可以这样做:
def instantiate( clsname ):
obj = loaded[clsname]
return obj()
我希望这能让你开始。
答案 1 :(得分:1)
以下是您可以使用的类注册表的草图:
class ClassRegistry(object):
def __init__(self):
self.classes = {}
def add_file_classes(self, fname, class_list):
globals = {}
exec open(fname) in globals
for class_name in class_list:
self.classes[class_name] = getattr(globals, class_name)
def get_class(self, class_name):
return self.classes[class_name]
阅读您的配置文件并像这样调用add_file_classes
:
reg = ClassRegistry()
reg.add_file_classes("/var/imports/foo.py", ["baz", "monkey"])
reg.add_file_classes("/var/imports/bar.py", ["ape"])
然后:
cls = reg.get_class("baz")
请注意,我们实际上并没有导入文件,只是执行它们并收集结果。