请求会话。close（）不关闭会话

Question

我希望对会话对象调用close（）来关闭会话。但看起来这并没有发生。我错过什么了吗

import requests
s = requests.Session()
url = 'https://google.com'
r = s.get(url)
s.close()
print("s is closed now")
r = s.get(url)
print(r)

输出： s现在关门了 <；答复[200]>

对s.get（）的第二次调用应该给出一个错误

Answer 1

在implementation for ^{}中，我们可以发现：

def close(self):
    """Closes all adapters and as such the session"""
    for v in self.adapters.values():
        v.close()

在^{} implementation内：

   def close(self):
        """Disposes of any internal state.

        Currently, this closes the PoolManager and any active ProxyManager,
        which closes any pooled connections.
        """
        self.poolmanager.clear()
        for proxy in self.proxy_manager.values():
            proxy.clear()

所以我能理解的是，它清除了Session对象的状态。因此，如果您登录到某个站点并且在Session中存储了一些cookie，那么一旦您使用session.close()方法，这些cookie将被删除。尽管如此，内部功能仍然可以发挥作用

Answer 2

您可以使用上下文管理器自动关闭它：

import requests

with requests.Session() as s:
    url = 'https://google.com'
    r = s.get(url)

见requests docs > Sessions：

This will make sure the session is closed as soon as the with block is exited, even if unhandled exceptions occurred.