為什么 IPython 不調用 sys.stderr.flush()？

Question

我正在使用 Python logging模塊並通過使用此 class 的實例覆蓋sys.stderr將stderr重定向到日志文件...

# Redirect stderr to main_logger using this class
    class CustomWriter:
        def __init__(self, logger, level):
            self.buffer = ''
            self.logger = logger
            self.level = level

        def write(self, message):
            self.buffer += message

        def flush(self):
            if self.buffer != '':
                for line in self.buffer.split('\n'):
                    self.logger.log(self.level, line)
                self.buffer = ''

當我將代碼作為腳本運行時它工作正常，但是當我使用 IPython 在交互模式下運行相同的代碼時它不會記錄任何內容，我認為是因為 IPython 從不調用sys.stdout的flush()方法，如下所示.

import sys
sys.stderr.flush = lambda: print("flushed")
raise Exception("This is a test")

上面的代碼作為腳本運行時...

Traceback (most recent call last):
flushed
  File "C:/_MyFiles/Projects/git_projects/fto-util/scratch.py", line 3, in <module>
flushed
    raise Exception("This is a test")
flushed
Exception: This is a test
flushed

Process finished with exit code 1

當與 vanilla Python 以交互模式運行時...

>>> import sys
>>> sys.stderr.flush = lambda: print("flushed")
flushed
>>> raise Exception("This is a test")
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
Exception: This is a test
flushed

使用 IPython...

In [1]: import sys
In [2]: sys.stderr.flush = lambda: print("flushed")
In [3]: raise Exception("This is a test")
---------------------------------------------------------------------------
Exception                                 Traceback (most recent call last)
<ipython-input-3-f2b5a8ce26d8> in <module>
----> 1 raise Exception("This is a test")

Exception: This is a test

IPython 是在這里做一些棘手的事情，還是我只是對sys.stderr的行為方式做出了無效的假設？ 我應該如何解決這個問題？