Python 子进程正在运行不同版本的 Python [英] Python subprocess is running a different version of Python

问题描述

我正在尝试创建一个 Python 脚本来执行其他 Python 脚本，它适用于大多数脚本，但在遇到 print('anything', end='') 时会失败.这是因为子进程运行的是 2.7，而不是 3.4.我一生都无法弄清楚如何让子流程运行 3.4.

I'm trying to create a Python script to execute other Python scripts, and it works on most scripts, but will fail when it encounters print('anything', end=''). This is because the subprocess is running 2.7, rather than 3.4. I cannot for the life of me figure out how to have the subprocess run 3.4.

Python 3.4.3 (v3.4.3:9b73f1c3e601, Feb 24 2015, 22:43:06) [MSC v.1600 32 bit (In
tel)] on win32
Type "help", "copyright", "credits" or "license" for more information.
>>> import sys
>>> import subprocess
>>> sys.version
'3.4.3 (v3.4.3:9b73f1c3e601, Feb 24 2015, 22:43:06) [MSC v.1600 32 bit (Intel)]'
>>> results = subprocess.check_output('testprint.py', shell=True)
>>> results
b'2.7 (r27:82525, Jul  4 2010, 07:43:08) [MSC v.1500 64 bit (AMD64)]\r\n'

testprint.py 就是这样:

testprint.py is just this:

import sys
print(sys.version)

当然，我会在发布问题后意识到解决方案.我将代码修改为以下内容:

And of course I would realize a solution after posting the question. I modified the code to the following:

path = r'C:\Python34\python.exe'
results = subprocess.check_output([path, 'testprint.py'], shell=True)

现在我正在传递脚本将运行的可执行路径.不过，我还是喜欢更优雅、更持久的解决方案.

Now I'm passing in the executable path the script will be run through. Still, I would love a more elegant and permanent solution.

推荐答案

一个解决方案是:

import sys
import subprocess

subprocess.call([sys.executable, 'testprint.py'])

sys.executable是运行代码的python二进制文件的位置.请注意，由于某些原因 shell=True 在 sys.argv 上启动没有任何参数的 python 二进制文件，所以要么省略该选项，使用字符串或 shlex.quote.这实际上与您的解决方案相同，但可执行位置不是硬编码的.

sys.executable is the location of the python binary running the code executing. Note that for some reason shell=True launches the python binary without any arguments on sys.argv, so either omit that option, use a string or shlex.quote. This is effectively the same as your solution, but the executable position is not hard-coded.

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