如何從 python 靜默運行批處理文件 (.bat) 或命令？

Question

如何從 python 運行批處理文件而不回顯？

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

預期結果：

doing command
finished command

結果：

doing command
Some command results
finished command

我嘗試使用 os.system 而不是批處理文件，但結果相同。

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

注意：使用 cmd /k，“完成的命令”不顯示

Answer 1

您應該使用subprocess.getoutput或subprocess.Popen與 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的好處是可以如下打開它作為上下文管理器，保證資源清理，還可以獨立命令進程stdin，子進程不會阻塞你的python進程，簡單來說它有更多用途比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")

編輯：如果您對進程的 output 不感興趣，則將其放入 devnull 是另一種選擇，它只是將其丟棄。

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")