decorators example

decorators_example.py

import json

def introspect(func):

    def inner(*args, **kwargs):
        result = func(*args, **kwargs)
        print('name:', func.__name__)
        print('doc:', func.__doc__)
        print('args:', args)
        return result
    return inner


def jsonify(func):
    def inner(*args, **kwargs):
        return json.dumps(func(*args, **kwargs))
    return inner

@jsonify
@introspect
def foo(*args):
    """
    return args
    :param args:
    :return:
    """
    return args

print(foo('hello', 'world'))


# class exercise

from functools import partial
import getpass

def decorator(f):
    print_ = partial(print)
    def inner(*args, **kwargs):
        args = [getpass.getuser()] + [arg[:100] for arg in args]
        with open('/tmp/log', 'a') as log:
            p = partial(print_, file=log)
            p(*args, **kwargs)
    return inner


@decorator
def print(*args, **kwargs):
    return None


print('hello', 'world')