python从子进程获取grep -q的输出

import subprocess

def get_grep_output(pattern, text):
    # 使用subprocess创建子进程并执行grep命令
    process = subprocess.Popen(['grep', '-q', pattern],
                               stdin=subprocess.PIPE,
                               stdout=subprocess.PIPE,
                               stderr=subprocess.PIPE,
                               universal_newlines=True)
    
    # 向子进程的stdin发送要匹配的文本
    process.stdin.write(text)
    process.stdin.close()
    
    # 获取子进程的输出结果
    output = process.stdout.read()
    process.stdout.close()
    
    # 等待子进程结束
    process.wait()
    
    # 返回grep命令的输出结果
    return output

# 测试代码
pattern = 'example'
text = 'This is an example text.'
output = get_grep_output(pattern, text)
print(output)