gistfile1.py

import functools
import inspect


def require(check):
    def decorator(f):
        sig = inspect.signature(f)
        @functools.wraps(f)
        def wrapper(*args, **kwargs):
            bound_args = sig.bind(*args, **kwargs)
            for k, v in bound_args.arguments.items():
                check.__globals__[k] = v
            assert check()
            return f(*args, **kwargs)
        return wrapper
    return decorator