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Python subprocess 实战:用几行代码搞定系统命令自动化

  • 2026-07-04 02:32:33
Python subprocess 实战:用几行代码搞定系统命令自动化

每天早上要手动去服务器跑一堆脚本,或者批量压缩一堆文件、定期备份数据库——每次都要开终端、敲命令、等结果、再敲下一条……

累不累?

今天来聊聊 Python 的 subprocess 模块。这个模块很多人知道但不太会用,或者只会最简单的 os.system()——但那东西基本算上古遗物了,能用但控制力极差。

subprocess

才是正经的姿势。


一、先说 os.system() 有啥问题

很多入门教程还在教这个:

python
import os
os.system("ls -la")

用是能用,但有几个致命缺陷:

1. 拿不到输出——返回值只有退出码(0成功,非0失败),命令打印的内容你看不到

2. 没法传参——参数拼接容易出问题,一不小心就 shell 注入了

3. 错误处理烂——失败了你也不知道具体原因

所以,subprocess 是真正的替代方案。


二、subprocess 基础用法

2.1 最简单的调用

python
import subprocess

result = subprocess.run(["ls", "-la"], capture_output=True, text=True)

print(result.stdout)   # 命令的标准输出
print(result.stderr)   # 错误信息
print(result.returncode)  # 退出码,0 = 成功

注意几个参数:

  • capture_output=True:捕获 stdout 和 stderr
  • text=True:以字符串形式返回,不用手动 decode
  • check=True:如果命令失败,自动抛出异常(推荐加上)

2.2 加上错误处理

python
import subprocess

def run_cmd(cmd: list[str]) -> str:
    """执行命令,失败时抛出异常并打印错误"""
    try:
        result = subprocess.run(
            cmd,
            capture_output=True,
            text=True,
            check=True  # 非0退出码自动报错
        )
        return result.stdout.strip()
    except subprocess.CalledProcessError as e:
        print(f"命令执行失败: {e.cmd}")
        print(f"错误信息: {e.stderr}")
        raise

# 示例:查看磁盘使用情况
output = run_cmd(["df", "-h"])
print(output)

三、实际场景:批量执行任务

3.1 批量压缩图片

假设你有一个目录里全是 PNG,需要批量转成 JPG(用 ImageMagick 的 convert 命令):

python
import subprocess
from pathlib import Path

def batch_convert_images(src_dir: str, dst_dir: str):
    src = Path(src_dir)
    dst = Path(dst_dir)
    dst.mkdir(parents=True, exist_ok=True)

    png_files = list(src.glob("*.png"))
    print(f"找到 {len(png_files)} 个 PNG 文件,开始转换...")

    success, failed = 0, 0
    for png in png_files:
        output_path = dst / png.with_suffix(".jpg").name
        try:
            subprocess.run(
                ["convert", str(png), str(output_path)],
                check=True,
                capture_output=True,
                text=True
            )
            success += 1
            print(f"✓ {png.name}")
        except subprocess.CalledProcessError as e:
            failed += 1
            print(f"✗ {png.name}: {e.stderr.strip()}")

    print(f"\n完成!成功 {success} 个,失败 {failed} 个")

batch_convert_images("/tmp/images", "/tmp/images_jpg")

3.2 定时备份 MySQL 数据库

这个场景超级实用——每天自动备份、按日期命名、删除7天前的旧文件:

python
import subprocess
from pathlib import Path
from datetime import datetime, timedelta

DB_HOST = "localhost"
DB_USER = "root"
DB_PASS = "your_password"
DB_NAME = "mydb"
BACKUP_DIR = Path("/data/mysql_backup")

def backup_mysql():
    BACKUP_DIR.mkdir(parents=True, exist_ok=True)
    
    today = datetime.now().strftime("%Y%m%d_%H%M%S")
    backup_file = BACKUP_DIR / f"{DB_NAME}_{today}.sql.gz"
    
    # mysqldump 输出通过管道 | gzip 压缩
    dump_cmd = [
        "mysqldump",
        f"--host={DB_HOST}",
        f"--user={DB_USER}",
        f"--password={DB_PASS}",
        "--single-transaction",  # 不锁表
        DB_NAME
    ]
    
    gzip_cmd = ["gzip", "-c"]
    
    with open(backup_file, "wb") as f:
        dump_proc = subprocess.Popen(dump_cmd, stdout=subprocess.PIPE, stderr=subprocess.PIPE)
        gzip_proc = subprocess.Popen(gzip_cmd, stdin=dump_proc.stdout, stdout=f)
        dump_proc.stdout.close()
        gzip_proc.communicate()
        dump_proc.wait()
    
    if dump_proc.returncode != 0:
        backup_file.unlink(missing_ok=True)
        raise RuntimeError(f"mysqldump 失败,退出码: {dump_proc.returncode}")
    
    print(f"备份成功: {backup_file}")
    
    # 清理7天前的旧备份
    cutoff = datetime.now() - timedelta(days=7)
    for old_file in BACKUP_DIR.glob("*.sql.gz"):
        if datetime.fromtimestamp(old_file.stat().st_mtime) < cutoff:
            old_file.unlink()
            print(f"删除旧备份: {old_file.name}")

backup_mysql()

这里用了 subprocess.Popen 来实现命令管道,比直接用 shell=True 的字符串拼接安全得多。


四、进阶技巧

4.1 超时控制

命令挂死是常见问题,加个 timeout 参数就行:

python
try:
    result = subprocess.run(
        ["ping", "-c", "4", "8.8.8.8"],
        capture_output=True,
        text=True,
        timeout=10  # 10秒超时
    )
except subprocess.TimeoutExpired:
    print("命令超时了!")

4.2 环境变量注入

有时候子进程需要特定的环境变量,可以这样传:

python
import os

custom_env = os.environ.copy()
custom_env["MY_ENV_VAR"] = "hello_world"
custom_env["PATH"] = "/usr/local/bin:" + custom_env["PATH"]

result = subprocess.run(
    ["my_script.sh"],
    capture_output=True,
    text=True,
    env=custom_env
)

4.3 实时输出流式读取

有些命令执行时间很长,你希望实时看到输出,而不是等命令结束才一次性打印:

python
import subprocess
import sys

def run_with_realtime_output(cmd: list[str]):
    """实时打印命令输出"""
    process = subprocess.Popen(
        cmd,
        stdout=subprocess.PIPE,
        stderr=subprocess.STDOUT,  # 把 stderr 合并到 stdout
        text=True,
        bufsize=1  # 行缓冲
    )
    
    for line in iter(process.stdout.readline, ""):
        sys.stdout.write(line)
        sys.stdout.flush()
    
    process.wait()
    return process.returncode

# 比如跑一个耗时的 pip install
run_with_realtime_output(["pip", "install", "-r", "requirements.txt"])

五、完整示例:服务器巡检脚本

最后来个综合的——每天自动巡检服务器状态,生成报告:

python
import subprocess
from datetime import datetime
from pathlib import Path

def check_disk():
    result = subprocess.run(["df", "-h", "--output=target,pcent"], 
                           capture_output=True, text=True, check=True)
    lines = result.stdout.strip().split("\n")[1:]  # 跳过表头
    warnings = []
    for line in lines:
        parts = line.split()
        if len(parts) == 2:
            mount, usage = parts
            pct = int(usage.rstrip("%"))
            if pct >= 80:
                warnings.append(f"  ⚠ {mount}: 使用率 {usage}")
    return warnings

def check_memory():
    result = subprocess.run(["free", "-h"], capture_output=True, text=True, check=True)
    return result.stdout.strip()

def check_top_processes():
    result = subprocess.run(
        ["ps", "aux", "--sort=-%cpu"],
        capture_output=True, text=True, check=True
    )
    lines = result.stdout.strip().split("\n")[:6]  # 取前5个进程
    return "\n".join(lines)

def generate_report():
    now = datetime.now().strftime("%Y-%m-%d %H:%M:%S")
    report_path = Path(f"/tmp/server_report_{datetime.now().strftime('%Y%m%d')}.txt")
    
    disk_warnings = check_disk()
    memory_info = check_memory()
    top_procs = check_top_processes()
    
    with open(report_path, "w") as f:
        f.write(f"服务器巡检报告 - {now}\n")
        f.write("=" * 50 + "\n\n")
        
        f.write("【磁盘使用情况】\n")
        if disk_warnings:
            f.write("发现以下磁盘使用率过高:\n")
            f.write("\n".join(disk_warnings) + "\n")
        else:
            f.write("磁盘使用正常\n")
        
        f.write("\n【内存使用情况】\n")
        f.write(memory_info + "\n")
        
        f.write("\n【CPU占用Top5进程】\n")
        f.write(top_procs + "\n")
    
    print(f"报告已生成: {report_path}")
    return str(report_path)

generate_report()

效果对比

方式获取输出错误处理管道支持安全性
os.system()仅退出码
subprocess.run()异常
subprocess.Popen()灵活

小结

subprocess

的核心就三件事:

1. 简单命令subprocess.run(),加上 capture_output=True, text=True, check=True 三件套

2. 需要管道或实时输出时,用 subprocess.Popen()

3. 记得加 timeout,别让程序挂死在那

工作中能自动化的都自动化,省下来的时间才是真正属于你的。


如果这篇文章对你有帮助,点赞+在看 支持一下,转发给身边还在手动跑命令的朋友,让他早点解放双手 🙌

我是几行代码,关注我,下期见。

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  1. CONNECT:[ UseTime:0.000626s ] mysql:host=127.0.0.1;port=3306;dbname=f_mffb;charset=utf8mb4
  2. SHOW FULL COLUMNS FROM `fenlei` [ RunTime:0.000894s ]
  3. SELECT * FROM `fenlei` WHERE `fid` = 0 [ RunTime:0.000308s ]
  4. SELECT * FROM `fenlei` WHERE `fid` = 63 [ RunTime:0.000389s ]
  5. SHOW FULL COLUMNS FROM `set` [ RunTime:0.000487s ]
  6. SELECT * FROM `set` [ RunTime:0.000195s ]
  7. SHOW FULL COLUMNS FROM `article` [ RunTime:0.000541s ]
  8. SELECT * FROM `article` WHERE `id` = 488443 LIMIT 1 [ RunTime:0.000421s ]
  9. UPDATE `article` SET `lasttime` = 1783123831 WHERE `id` = 488443 [ RunTime:0.006727s ]
  10. SELECT * FROM `fenlei` WHERE `id` = 66 LIMIT 1 [ RunTime:0.011240s ]
  11. SELECT * FROM `article` WHERE `id` < 488443 ORDER BY `id` DESC LIMIT 1 [ RunTime:0.000672s ]
  12. SELECT * FROM `article` WHERE `id` > 488443 ORDER BY `id` ASC LIMIT 1 [ RunTime:0.000493s ]
  13. SELECT * FROM `article` WHERE `id` < 488443 ORDER BY `id` DESC LIMIT 10 [ RunTime:0.000867s ]
  14. SELECT * FROM `article` WHERE `id` < 488443 ORDER BY `id` DESC LIMIT 10,10 [ RunTime:0.000773s ]
  15. SELECT * FROM `article` WHERE `id` < 488443 ORDER BY `id` DESC LIMIT 20,10 [ RunTime:0.000643s ]
0.096467s