如何将参数传递给python grequests中的钩子 [英] How to pass parameters to hooks in python grequests

问题描述

根据请求文档，可以将事件挂钩添加到 .get() 函数.

According the Requests documentation, event hooks can be added to .get() function.

requests.get('http://httpbin.org', hooks=dict(response=print_url))
def print_url(r, *args, **kwargs):
    print(r.url)

这很好，但是如何使用自定义参数设置 *args，例如，我想将一些自定义值传递给 print_url()，如何在 *args 中设置这些值?这样的事情失败了:

This is fine but how to set *args with custom parameters, for example, I want to pass some custom values to print_url(), how to set those in *args ? Something like this fails :

args = ("search_item", search_item)
rs = (grequests.get(u, hooks={'response': [parse_books],'args': [args]}) for u in urls)

推荐答案

您不能指定要传递给响应挂钩的额外参数.如果你想指定额外的信息，你应该创建一个你调用的函数，然后返回一个作为钩子传递的函数，例如，

You cannot specify extra arguments to pass to a response hook. If you want extra information to be specified you should make a function that you call which then returns a function to be passed as a hook, e.g.,

def hook_factory(*factory_args, **factory_kwargs):
    def response_hook(response, *request_args, **request_kwargs):
        # use factory_kwargs
        # etc.
        return None # or the modified response
    return response_hook

grequests.get(u, hooks={'response': [hook_factory(search_item=search_item)]})

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