将 python 函数的输出从 STDOUT 重定向到 Python 中的变量

这就是我想要实现的目标

def fun():
    runner = InteractiveConsole()
    while(True):
        code = raw_input()
        code.rstrip('\n')
        # I want to achieve the following
        # By default the output and error of the 'code' is sent to STDOUT and STDERR
        # I want to obtain the output in two variables out and err
        out,err = runner.push(code)

到目前为止我看过的所有解决方案都使用任一管道来发出单独的脚本执行命令（在我的情况下这是不可能的）。我还有其他方法可以实现这一目标吗？

import StringIO, sys
from contextlib import contextmanager

@contextmanager
def redirected(out=sys.stdout, err=sys.stderr):
    saved = sys.stdout, sys.stderr
    sys.stdout, sys.stderr = out, err
    try:
        yield
    finally:
        sys.stdout, sys.stderr = saved


def fun():
    runner = InteractiveConsole()
    while True:
        out = StringIO.StringIO()
        err = StringIO.StringIO()
        with redirected(out=out, err=err):
            out.flush()
            err.flush()
            code = raw_input()
            code.rstrip('\n')
            # I want to achieve the following
            # By default the output and error of the 'code' is sent to STDOUT and STDERR
            # I want to obtain the output in two variables out and err
            runner.push(code)
            output = out.getvalue()
        print output

在较新版本的 python 中，内置了此上下文管理器：

with contextlib.redirect_stdout(out), contextlib.redirect_stderr(err):
    ...