context decorator

sample.py

# See: https://blog.amedama.jp/entry/2015/10/16/224740
import inspect
def context(session = Session):
    def _decorator(func):
        def __decorator(*args, **kwargs):
            name = "context"
            value = "some thing"
            try:
                args_names = inspect.getargspec(func)[0]
                target_pos = args_names.index(name)
                args_list = list(args)
                args_list.insert(target_pos, value)
                ret = func(*args_list, **kwargs)
            finally:
                return ret
	      return __decorator
    return _decorator