使用python与命令行程序交互

import subprocess

# 运行一个简单的命令并获取输出
result = subprocess.run(['ls', '-l'], capture_output=True, text=True)
print(result.stdout)

import subprocess

# 启动一个子进程
process = subprocess.Popen(['cat'], stdin=subprocess.PIPE, stdout=subprocess.PIPE, stderr=subprocess.PIPE, text=True)

# 发送数据到子进程
stdout, stderr = process.communicate(input="Hello, World!\n")

print(stdout)  # 输出: Hello, World!

try:
    result = subprocess.run(['nonexistent_command'], check=True, capture_output=True, text=True)
except subprocess.CalledProcessError as e:
    print(f"Command failed with return code {e.returncode}: {e.stderr}")

result = subprocess.run(['ls', '-l'], capture_output=True, text=True, encoding='utf-8', errors='ignore')
print(result.stdout)

process = subprocess.Popen(['long_running_command'], stdout=subprocess.PIPE, stderr=subprocess.PIPE, text=True)

while process.poll() is None:
    output = process.stdout.readline()
    if output:
        print(output.strip())

rc = process.poll()