从python调用时如何等待批处理文件结束？

Question

I have a batch file which is zipping a folder as follows(zip.bat):

for /d %%X in (D:/sample/target/bin) do "c:\Program Files\7-Zip\7z.exe" a -mx "%%X.zip" "%%X\*"

The batch file will zip folder bin and works correctly. Now am calling this batch from a python script as follows:

import subprocess as sp
import sys
start_zip_batch = sp.Popen(['D:/zip.bat'],stdin=sp.PIPE, stdout=sp.PIPE, stderr=sp.PIPE, shell = True)
start_zip_batch.wait()

So, now when the script is made to execute it creates the bin.zip folder but keep showing 0 bytes inside it and after a while it stops responding and i need to manually close it. The bin folder is around 403 mb. So, please suggest how shall i call zip.bat from python such that it creates te zip folder and then gets closed neatly.

Answer 1

There are several subprocess methods that wait for completion.

check_call is useful if you want to do cleanup or reporting based on the command return code.

subprocess.check_call(args, *, stdin=None, stdout=None, stderr=None, shell=False)

Run command with arguments. Wait for command to complete. If the return code was zero then return, otherwise raise CalledProcessError. The CalledProcessError object will have the return code in the returncode attribute.

The Docs

Answer 2

print('filename')

如果您在.bat文件中没有任何输出，则可以使用

Answer 3

The easiest and most modern way is to use subprocess.run() which executes the process and waits for it to complete:

import subprocess
p = subprocess.run(['D:/zip.bat'])

This will execute the process and return a CompletedProcess object for which you can inspect the returncode attribute to determine that status.

The process's stdout and stderr destinations are unchanged, eg output will still appear on the terminal if the command is run from a terminal.

You can capture the output of both stdout and stderr if you want:

p = subprocess.run(['D:/zip.bat'], capture_output=True)
print(p.stdout.decode())
print(p.stderr.decode())