话不多说，直接上代码:

def main():
    pexec = None
    command = "F:\C++Project\testFolder\outputInfo.bat"
    pexec = Popen(
            "cmd.exe /c" + "outputInfo.bat", stdin=PIPE, stdout=PIPE, stderr=PIPE, shell=False,universal_newlines=True
        )
    curline = pexec.stdout.readline()
    while (curline != b''):
        print(curline)
        curline = pexec.stdout.readline()
    pexec.wait()

对子进程介绍的参考文章可以参考：

python中的subprocess.Popen（）使用 - 莫水千流 - 博客园