The StreamHandler class sends logging output to streams such as
sys.stdout, sys.stderr or any file-like object (or, more
precisely, any object which supports write() and flush()
methods).
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Returns a new instance of the StreamHandler class. If strm is
specified, the instance will use it for logging output; otherwise,
sys.stderr will be used.
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If a formatter is specified, it is used to format the record.
The record is then written to the stream with a trailing newline.
If exception information is present, it is formatted using
traceback.print_exception() and appended to the stream.
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Flushes the stream by calling its flush() method. Note that
the close() method is inherited from Handler and
so does nothing, so an explicit flush() call may be needed
at times.
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