不向上打印错误消息的Pythonic方法

我试图在调用库时抑制日志中的错误/警告。假设我有这个代码

        try:
            kazoo_client.start()
        except:
            pass

---

这是在调用zookeeper客户端，该客户端会引发一些异常，现在我不希望在调用

kazoo\u客户端时日志中出现警告/错误。start（）

在调用客户端时是否有方法抑制此异常如果您知道异常，请尝试：

如果不抑制，则在最后一次迭代时抛出

StopIteration

错误

>>> x = (i for i in range(10))

>>> for i in range(11):
...     print(next(x))

0
1
2
3
4
5
6
7
8
9
Traceback (most recent call last):

  File "<ipython-input-10-562798e05ad5>", line 2, in <module>
    print(next(x))

StopIteration

编辑：

要抑制所有异常，请执行以下操作：

with suppress(Exception):
    kazoo_client.start()

---

假设python 2.7.17

尝试以下方法：

import sys, StringIO

def funky() :
 "1" + 1 # This should raise an error

sys.stderr = StringIO.StringIO()
funky() # this should call the funky function

您的代码应该如下所示：

import sys, StringIO

# import kazoo somehere around here

sys.stderr = StringIO.StringIO()
kazoo_client.start()

最后是Python 3的例子：

import sys
from io import StringIO
# import kazoo somehere around here

sys.stderr = StringIO()
kazoo_client.start()

---

我想建议一种更通用的方法，它可以在一般情况下使用。 我给大家留下一个例子，说明如何创建一个忽略错误的装饰器

import functools


# Use the Decorator Design Pattern

def ignore_error_decorator(function_reference):
    @functools.wraps(function_reference)  # the decorator inherits the original function signature
    def wrapper(*args):
        try:
            result = function_reference(*args)  # execute the function
            return result  # If the function executed correctly, return
        except Exception as e:
            pass  # Default ignore; You can also log the error or do what ever you want

    return wrapper  # Return the wrapper reference


if __name__ == '__main__':
    # First alternative to use. Compose the decorator with another function
    def my_first_function(a, b):
        return a + b

    rez_valid = ignore_error_decorator(my_first_function)(1, 3)
    rez_invalid = ignore_error_decorator(my_first_function)(1, 'a')
    print("Alternative_1 valid: {result}".format(result=rez_valid))
    print("Alternative_1 invalid: {result}".format(result=rez_invalid)) # None is return by the exception bloc

    # Second alternative. Decorating a function
    @ignore_error_decorator
    def my_second_function(a, b):
        return a + b


    rez_valid = my_second_function(1, 5)
    rez_invalid = my_second_function(1, 'a')
    print("Alternative_2 valid: {result}".format(result=rez_valid))
    print("Alternative_2 invalid: {result}".format(result=rez_invalid))  # None is return by the exception bloc

回到你的问题上来，使用我的替代方案，你必须跑步

ignore_error_decorator(kazoo_client.start)()

---

阅读module@furas的文档我知道，这件事是我只想在

kazoo\u client.start（）

上做一些魔术，而不是在任何其他地方我想我仍然可以看到打印出来的警告，我希望我们能通过

SomeError

，因为任何例外都没有帮助。我是否遗漏了一些已编辑的内容，您可以检查吗？仍然没有被抑制：（您确定异常来自此行本身吗？您可以粘贴您得到的异常吗？是的，这很好！但现在我的实际问题已解决，但我仍然在由启动的线程中看到未处理的异常

import functools


# Use the Decorator Design Pattern

def ignore_error_decorator(function_reference):
    @functools.wraps(function_reference)  # the decorator inherits the original function signature
    def wrapper(*args):
        try:
            result = function_reference(*args)  # execute the function
            return result  # If the function executed correctly, return
        except Exception as e:
            pass  # Default ignore; You can also log the error or do what ever you want

    return wrapper  # Return the wrapper reference


if __name__ == '__main__':
    # First alternative to use. Compose the decorator with another function
    def my_first_function(a, b):
        return a + b

    rez_valid = ignore_error_decorator(my_first_function)(1, 3)
    rez_invalid = ignore_error_decorator(my_first_function)(1, 'a')
    print("Alternative_1 valid: {result}".format(result=rez_valid))
    print("Alternative_1 invalid: {result}".format(result=rez_invalid)) # None is return by the exception bloc

    # Second alternative. Decorating a function
    @ignore_error_decorator
    def my_second_function(a, b):
        return a + b


    rez_valid = my_second_function(1, 5)
    rez_invalid = my_second_function(1, 'a')
    print("Alternative_2 valid: {result}".format(result=rez_valid))
    print("Alternative_2 invalid: {result}".format(result=rez_invalid))  # None is return by the exception bloc

ignore_error_decorator(kazoo_client.start)()