如何从 python 静默运行批处理文件 (.bat) 或命令？

Question

如何从 python 运行批处理文件而不回显？

print("doing command")
with open("batch.bat", "w") as f:
    f.write("@echo off\nsome_command")
subprocess.call(['batch.bat'])
input("finished command")

预期结果：

doing command
finished command

结果：

doing command
Some command results
finished command

我尝试使用 os.system 而不是批处理文件，但结果相同。

print("doing command")
os.system('cmd /c "some_command"')
input("finished command")

注意：使用 cmd /k，“完成的命令”不显示

Answer 1

您应该使用subprocess.getoutput或subprocess.Popen与 stdout 指向subprocess.PIPE ，（和 stderr 指向 stdout 或管道）

import subprocess
print("doing command")
with open("batch.bat", "w") as f:
    f.write("@echo off\nsome_command")
output = subprocess.getoutput('batch.bat')
input("finished command")

import subprocess
print("doing command")
with open("batch.bat", "w") as f:
    f.write("@echo off\nnsome_command")
process = subprocess.Popen('batch.bat',stdout=subprocess.PIPE,stderr=subprocess.STDOUT)
output = process.stdout.read()
input("finished command")

doing command
finished command

使用Popen的好处是可以如下打开它作为上下文管理器，保证资源清理，还可以独立命令进程stdin，子进程不会阻塞你的python进程，简单来说它有更多用途比subprocess.getoutput

import subprocess
print("doing command")
with open("batch.bat", "w") as f:
    f.write("@echo off\nnsome_command")
with subprocess.Popen('batch.bat',stdout=subprocess.PIPE,stderr=subprocess.STDOUT) as process:
    output = process.stdout.read()
input("finished command")

编辑：如果您对进程的 output 不感兴趣，则将其放入 devnull 是另一种选择，它只是将其丢弃。

import subprocess
import os
print("doing command")
with open("batch.bat", "w") as f:
    f.write("@echo off\nnsome_command")
with open(os.devnull,'w') as null:
    process = subprocess.Popen('batch.bat',stdout=null,stderr=null)
input("finished command")