为Subprocess.Popen的STDOUT分配多个属性

import subprocess

# 启动子进程，同时捕获 stdout 和 stderr
process = subprocess.Popen(['your_command', 'arg1', 'arg2'], stdout=subprocess.PIPE, stderr=subprocess.PIPE)

# 读取 stdout 和 stderr 的输出
stdout_output, stderr_output = process.communicate()

# 将输出从字节转换为字符串（如果需要）
stdout_str = stdout_output.decode('utf-8')
stderr_str = stderr_output.decode('utf-8')

print('STDOUT:', stdout_str)
print('STDERR:', stderr_str)

import subprocess
import threading

def read_output(stream, output_list):
    for line in iter(stream.readline, b''):
        output_list.append(line.decode('utf-8'))
    stream.close()

process = subprocess.Popen(['your_command', 'arg1', 'arg2'], stdout=subprocess.PIPE, stderr=subprocess.PIPE)

stdout_list = []
stderr_list = []

# 创建并启动线程
stdout_thread = threading.Thread(target=read_output, args=(process.stdout, stdout_list))
stderr_thread = threading.Thread(target=read_output, args=(process.stderr, stderr_list))

stdout_thread.start()
stderr_thread.start()

# 等待线程完成
stdout_thread.join()
stderr_thread.join()

# 获取输出
stdout_output = ''.join(stdout_list)
stderr_output = ''.join(stderr_list)

print('STDOUT:', stdout_output)
print('STDERR:', stderr_output)

import subprocess
import select

process = subprocess.Popen(['your_command', 'arg1', 'arg2'], stdout=subprocess.PIPE, stderr=subprocess.PIPE)

outputs = {'stdout': [], 'stderr': []}

while True:
    reads, _, _ = select.select([process.stdout, process.stderr], [], [])
    
    for fd in reads:
        if fd == process.stdout:
            output = process.stdout.readline().decode('utf-8')
            if output:
                outputs['stdout'].append(output)
        elif fd == process.stderr:
            output = process.stderr.readline().decode('utf-8')
            if output:
                outputs['stderr'].append(output)
    
    if process.poll() is not None:
        break

stdout_output = ''.join(outputs['stdout'])
stderr_output = ''.join(outputs['stderr'])

print('STDOUT:', stdout_output)
print('STDERR:', stderr_output)