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问如何正确处理Python3上的多个连接错误异常？与python-binance包相关
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Stack Overflow用户

提问于 2022-08-15 04:44:54

回答 1查看 99关注 0票数 1

我正在使用python-binance包版本1.0.16 (今天的最后一个版本)编写一个小的加密货币跟踪器。

我的问题出现在进程的某些特定部分，即通过Client使用api和密钥登录到Binance服务器。这是它的代码：

from binance.Client import Client

api = input("Paste your API KEY here: ")
secret = input("Now paste your SECRET KEY here: ")

client = Client(api_key=api, api_secret=secret, tld = "com")

注意:只要用户有稳定的internet连接，就不会引发任何异常，从而允许跟踪器按预期工作。

但是，如果用户甚至没有连接到internet (显然没有注意到)，在执行上面的代码后将引发以下异常：

Traceback (most recent call last):

  File "F:\Python\Python310\lib\site-packages\urllib3\connection.py", line 174, in _new_conn
    conn = connection.create_connection(

  File "F:\Python\Python310\lib\site-packages\urllib3\util\connection.py", line 72, in create_connection
    for res in socket.getaddrinfo(host, port, family, socket.SOCK_STREAM):

  File "F:\Python\Python310\lib\socket.py", line 955, in getaddrinfo
    for res in _socket.getaddrinfo(host, port, family, type, proto, flags):

gaierror: [Errno 11001] getaddrinfo failed


During handling of the above exception, another exception occurred:

Traceback (most recent call last):

  File "F:\Python\Python310\lib\site-packages\urllib3\connectionpool.py", line 703, in urlopen
    httplib_response = self._make_request(

  File "F:\Python\Python310\lib\site-packages\urllib3\connectionpool.py", line 386, in _make_request
    self._validate_conn(conn)

  File "F:\Python\Python310\lib\site-packages\urllib3\connectionpool.py", line 1042, in _validate_conn
    conn.connect()

  File "F:\Python\Python310\lib\site-packages\urllib3\connection.py", line 358, in connect
    self.sock = conn = self._new_conn()

  File "F:\Python\Python310\lib\site-packages\urllib3\connection.py", line 186, in _new_conn
    raise NewConnectionError(

NewConnectionError: <urllib3.connection.HTTPSConnection object at 0x0000020B4CEB4A00>: Failed to establish a new connection: [Errno 11001] getaddrinfo failed


During handling of the above exception, another exception occurred:

Traceback (most recent call last):

  File "F:\Python\Python310\lib\site-packages\requests\adapters.py", line 489, in send
    resp = conn.urlopen(

  File "F:\Python\Python310\lib\site-packages\urllib3\connectionpool.py", line 787, in urlopen
    retries = retries.increment(

  File "F:\Python\Python310\lib\site-packages\urllib3\util\retry.py", line 592, in increment
    raise MaxRetryError(_pool, url, error or ResponseError(cause))

MaxRetryError: HTTPSConnectionPool(host='api.binance.com', port=443): Max retries exceeded with url: /api/v3/ping (Caused by NewConnectionError('<urllib3.connection.HTTPSConnection object at 0x0000020B4CEB4A00>: Failed to establish a new connection: [Errno 11001] getaddrinfo failed'))


During handling of the above exception, another exception occurred:

Traceback (most recent call last):

  File "F:\Python\Python310\lib\site-packages\spyder_kernels\py3compat.py", line 356, in compat_exec
    exec(code, globals, locals)

  File "c:\users\user\.spyder-py3\btcusdt_only-signals.system.py", line 207, in <module>
    client = Client(api_key= api_key, api_secret= secret_key, tld= "com")

  File "F:\Python\Python310\lib\site-packages\binance\client.py", line 300, in __init__
    self.ping()

  File "F:\Python\Python310\lib\site-packages\binance\client.py", line 526, in ping
    return self._get('ping', version=self.PRIVATE_API_VERSION)

  File "F:\Python\Python310\lib\site-packages\binance\client.py", line 371, in _get
    return self._request_api('get', path, signed, version, **kwargs)

  File "F:\Python\Python310\lib\site-packages\binance\client.py", line 334, in _request_api
    return self._request(method, uri, signed, **kwargs)

  File "F:\Python\Python310\lib\site-packages\binance\client.py", line 314, in _request
    self.response = getattr(self.session, method)(uri, **kwargs)

  File "F:\Python\Python310\lib\site-packages\requests\sessions.py", line 600, in get
    return self.request("GET", url, **kwargs)

  File "F:\Python\Python310\lib\site-packages\requests\sessions.py", line 587, in request
    resp = self.send(prep, **send_kwargs)

  File "F:\Python\Python310\lib\site-packages\requests\sessions.py", line 701, in send
    r = adapter.send(request, **kwargs)

  File "F:\Python\Python310\lib\site-packages\requests\adapters.py", line 565, in send
    raise ConnectionError(e, request=request)

ConnectionError: HTTPSConnectionPool(host='api.binance.com', port=443): Max retries exceeded with url: /api/v3/ping (Caused by NewConnectionError('<urllib3.connection.HTTPSConnection object at 0x0000020B4CEB4A00>: Failed to establish a new connection: [Errno 11001] getaddrinfo failed'))

因此，从本质上讲，有4个例外需要处理：

gaierror
NewConnectionError
MaxRetryError
ConnectionError

首先，我尝试了以下基于this approach的代码，因为我认为gaierror始终是引发的第一个异常，因此我认为通过正确地处理它，不会引发其余的异常：

from binance.Client import Client
import socket

api = input("Paste your API KEY here: ")
secret = input("Now paste your SECRET KEY here: ")

while True:
    try: 
        client = Client(api_key= api_key, api_secret= secret_key, tld= "com")
        break
    except socket.gaierror:
        print("You are not connected to the internet, first make sure to be connected before executing this program")
        input("Once done, press Enter key:")

不幸的是，我的方法没有处理任何事情，最终抛出的输出与上面描述的完全相同，只有相同的异常以相同的顺序引发。

然而，这另一个工作！：

from binance.Client import Client

api = input("Paste your API KEY here: ")
secret = input("Now paste your SECRET KEY here: ")

while True:
    try: 
        client = Client(api_key= api_key, api_secret= secret_key, tld= "com")
        break
    except Exception:
        print("You are not connected to the internet, first make sure to be connected before executing this program")
        input("Once done, press Enter key:")

所以，伙计们，我来这里是想知道是否有比设置except Exception来处理4种异常更好的方法？你知道，在我看来，它看起来不是很Good Practices，也没有让我确切地知道背后发生了什么，以及如何解释用户为什么会发生这样的事情，所以你能帮我解决这个问题吗？

python-3.x

sockets

exception

python-requests

binance

Stack Overflow用户

回答已采纳

发布于 2022-08-15 05:01:48

您可以像这样扩展除其他块：

from binance.Client import Client
import socket
from urllib3.exceptions import NewConnectionError, MaxRetryError, ConnectionError

api = input("Paste your API KEY here: ")
secret = input("Now paste your SECRET KEY here: ")

while True:
    try: 
        client = Client(api_key= api_key, api_secret= secret_key, tld= "com")
        break
    except (socket.gaierror, NewConnectionError, MaxRetryError, ConnectionError) as e:
        print("You are not connected to the internet, first make sure to be connected before executing this program")
        input("Once done, press Enter key:")

或

    except gaierror as ge:
        print("something ge specific")
    except NewConnectionError as nce:
        print("something nce specific")
    # ...

使用后一种方法，您可以独立地处理每个错误。如果您只想过滤掉连接错误并在一个批处理它们，第一个是一个很好的选择。

谢谢。

票数 1

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页面原文内容由Stack Overflow提供。腾讯云小微IT领域专用引擎提供翻译支持

原文链接：

https://stackoverflow.com/questions/73356995

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