强制子进程使用 Python 3

Question

所以，我试图编写一个 Python 脚本，用于subprocess调用同一目录中的另一个 Python 脚本。这一切都很顺利，直到第二个脚本中的 import 语句被一个 Python 3-only 库访问，并且由于脚本是使用 打开的subprocess，而后者又使用 Python 2，所以ImportError发生了。

subprocess具体来说Popen()，我如何强制使用 Python 3 打开脚本？网上好像没有这方面的建议。

编辑

虽然我总是默认发布 MWE，但对于这个问题，我认为这是不必要的，但无论如何，当我开始发布它时，我突然想到使用“python3”而不仅仅是“python”，

stream = subprocess.Popen(['python3', 'app.py'])

现在该应用程序可以运行了。奇怪的是，我自己只安装了一个版本的 Python（3.7），并且python重定向到python3，所以很奇怪我不得不手动指定python3.

Answer 1

这是强制使用 Python3 运行脚本的方法：#! /usr/bin/python3import sys, subprocessif sys.version_info[:2] < (3, 0):&nbsp; &nbsp; # FORCE PYTHON3&nbsp; &nbsp; code = subprocess.check_call(['python3'] + sys.argv)&nbsp; &nbsp; raise SystemExit(code)print("Using Python v%d.%d" % sys.version_info[:2])在 Bash 中运行的示例：> python3 force_python3.py&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp;Using Python v3.7> python2 force_python3.py&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp;Using Python v3.7