capture.py 文件源码

def __init__(self, out=True, err=True, in_=True, mixed=False, now=True):
        self._oldout = sys.stdout
        self._olderr = sys.stderr
        self._oldin  = sys.stdin
        if out and not hasattr(out, 'file'):
            out = TextIO()
        self.out = out
        if err:
            if mixed:
                err = out
            elif not hasattr(err, 'write'):
                err = TextIO()
        self.err = err
        self.in_ = in_
        if now:
            self.startall()