'urllib' 无限循环答案

【问题标题】：'urllib' on an infinite loop'urllib' 无限循环
【发布时间】：2020-02-19 18:29:10
【问题描述】：

一段时间以来，我一直在尝试使用 cloud9 来帮助我处理工作中的重复性任务。然而，这些任务中的大多数都涉及网络抓取，我很难使用 urllib 库。

即使是简单的代码也不起作用。它一直在运行，我找不到原因。我会很感激一些提示...

from urllib.request import urlopen
import json
import ssl

# Ignore SSL certificate errors
ctx = ssl.create_default_context()
ctx.check_hostname = False
ctx.verify_mode = ssl.CERT_NONE

url = ('Enter - ')
html = urlopen(url, context=ctx).read()
str_data = open(html).read()
json_data = json.loads(str_data)

for entry in json_data:

name = entry[0];
    title = entry[1];
    print((name, title))

【问题讨论】：

标签： python amazon-web-services aws-cloud9

【解决方案1】：

如果不提供太多调试信息，只能假设您可能正在超时，因为您没有为 urlopen 函数提供超时。

为避免这种情况，请为您的 urlopen 函数设置一个合理的超时时间，使其不会无限期地运行。

【讨论】：

亚历克斯，你是对的。包含超时功能是一种切割动作。

【解决方案2】：

帮自己一个忙，将其替换为Requests。您的示例简化为：

import requests

url = "..."
json_data = requests.get(url).json()

for entry in json_data:
    name = entry[0]
    title = entry[1]
    print(name, title)

这也消除了代码中大量错误的可能性。

【讨论】：

我听从了你的建议，但不幸的是，我遇到了同样的问题。

【解决方案3】：

新代码

import requests
import json

url = "-"
json_data = requests.get(url).json()
info = json.loads(json_data)

print('User count:', len(info))
print(info)

调试模式：

[IKP3db-g] 15:43:52,971733 - INFO - IKP3db 1.4.1 - Inouk Python Debugger for CPython 3.6+
[IKP3db-g] 15:43:52,972714 - INFO - IKP3db listening on 127.0.0.1:15471
[IKP3db-g] 15:43:53,003016 - INFO - Connected with 127.0.0.1:50936
Traceback (most recent call last):
  File "/home/ubuntu/.local/lib/python3.6/site-packages/urllib3/connection.py", line 157, in _new_conn
    (self._dns_host, self.port), self.timeout, **extra_kw
  File "/home/ubuntu/.local/lib/python3.6/site-packages/urllib3/util/connection.py", line 84, in create_connection
    raise err
  File "/home/ubuntu/.local/lib/python3.6/site-packages/urllib3/util/connection.py", line 74, in create_connection
    sock.connect(sa)
TimeoutError: [Errno 110] Connection timed out

During handling of the above exception, another exception occurred:

Traceback (most recent call last):
  File "/home/ubuntu/.local/lib/python3.6/site-packages/urllib3/connectionpool.py", line 672, in urlopen
    chunked=chunked,
  File "/home/ubuntu/.local/lib/python3.6/site-packages/urllib3/connectionpool.py", line 376, in _make_request
    self._validate_conn(conn)
  File "/home/ubuntu/.local/lib/python3.6/site-packages/urllib3/connectionpool.py", line 994, in _validate_conn
    conn.connect()
  File "/home/ubuntu/.local/lib/python3.6/site-packages/urllib3/connection.py", line 334, in connect
    conn = self._new_conn()
  File "/home/ubuntu/.local/lib/python3.6/site-packages/urllib3/connection.py", line 169, in _new_conn
    self, "Failed to establish a new connection: %s" % e
urllib3.exceptions.NewConnectionError: <urllib3.connection.VerifiedHTTPSConnection object at 0x7fa2bb9729e8>: Failed to establish a new connection: [Errno 110] Connection timed out

During handling of the above exception, another exception occurred:

Traceback (most recent call last):
  File "/home/ubuntu/.local/lib/python3.6/site-packages/requests/adapters.py", line 449, in send
    timeout=timeout
  File "/home/ubuntu/.local/lib/python3.6/site-packages/urllib3/connectionpool.py", line 720, in urlopen
    method, url, error=e, _pool=self, _stacktrace=sys.exc_info()[2]
  File "/home/ubuntu/.local/lib/python3.6/site-packages/urllib3/util/retry.py", line 436, in increment
    raise MaxRetryError(_pool, url, error or ResponseError(cause))
urllib3.exceptions.MaxRetryError: HTTPSConnectionPool(host='ot.cloud.mapsfinancial.com', port=443): Max retries exceeded with url: /pegasus/api/consulta/caixa/saldos/carteira/DVG1%20FIA/2018-01-08 (Caused by NewConnectionError('<urllib3.connection.VerifiedHTTPSConnection object at 0x7fa2bb9729e8>: Failed to establish a new connection: [Errno 110] Connection timed out',))

During handling of the above exception, another exception occurred:

Traceback (most recent call last):
  File "/usr/local/lib/python3.6/dist-packages/ikp3db.py", line 2047, in main
  File "/usr/local/lib/python3.6/dist-packages/ikp3db.py", line 1526, in _runscript
    exec(statement, globals, locals)
  File "<string>", line 1, in <module>
  File "/home/ubuntu/environment/Testing.py", line 5, in <module>
    json_data = requests.get(url).json()
  File "/home/ubuntu/.local/lib/python3.6/site-packages/requests/api.py", line 75, in get
    return request('get', url, params=params, **kwargs)
  File "/home/ubuntu/.local/lib/python3.6/site-packages/requests/api.py", line 60, in request
    return session.request(method=method, url=url, **kwargs)
  File "/home/ubuntu/.local/lib/python3.6/site-packages/requests/sessions.py", line 533, in request
    resp = self.send(prep, **send_kwargs)
  File "/home/ubuntu/.local/lib/python3.6/site-packages/requests/sessions.py", line 646, in send
    r = adapter.send(request, **kwargs)
  File "/home/ubuntu/.local/lib/python3.6/site-packages/requests/adapters.py", line 516, in send
    raise ConnectionError(e, request=request)
requests.exceptions.ConnectionError: HTTPSConnectionPool(host='ot.cloud.mapsfinancial.com', port=443): Max retries exceeded with url: xxxxxxxx (Caused by NewConnectionError('<urllib3.connection.VerifiedHTTPSConnection object at 0x7fa2bb9729e8>: Failed to establish a new connection: [Errno 110] Connection timed out',))[IKP3db-g] 15:46:04,668520 - INFO - Uncaught exception. Entering post mortem debugging

【讨论】：