Class SystemLog

Lib/_apple_support.py:13–36

class SystemLog(io.TextIOWrapper):
    def __init__(self, log_write, level, **kwargs):
        kwargs.setdefault("encoding", "UTF-8")
        kwargs.setdefault("line_buffering", True)
        super().__init__(LogStream(log_write, level), **kwargs)

    def __repr__(self):
        return f"<SystemLog (level {self.buffer.level})>"

    def write(self, s):
        if not isinstance(s, str):
            raise TypeError(
                f"write() argument must be str, not {type(s).__name__}")

        # In case `s` is a str subclass that writes itself to stdout or stderr
        # when we call its methods, convert it to an actual str.
        s = str.__str__(s)

        # We want to emit one log message per line, so split
        # the string before sending it to the superclass.
        for line in s.splitlines(keepends=True):
            super().write(line)

        return len(s)


class LogStream(io.RawIOBase):