'''

Provides a way to run a script on the preferred Python version

'''

import os

import sys

'''

Imports the target script by filename and calls run()

'''

def run_by_import(filename, main):

import importlib

return getattr(importlib.import_module(os.path.basename(filename)), main)()

'''

Opens Python 2 subprocess to run target script

'''

def run_by_subprocess(filename):

# Python on Windows does not provide `python2` but instead `py` that receives version parameter

py2 = ['py', '-2'] if sys.platform.startswith('win') else ['python2']

import subprocess

return subprocess.run(py2 + [os.path.realpath(filename) + '.py'] + sys.argv[1:]).returncode

def on_allowed_version():

major = sys.version_info.major

if major == 2:

return True

if os.environ.get('EMSCRIPTEN_ALLOW_NEWER_PYTHON'):

import logging

from tools import colored_logger

logging.warning('Running on Python %s which is not officially supported yet', major)

return True

return False

'''

Runs filename+'.py' by opening Python 2 subprocess if required, or by importing.

'''

def run(filename, profile=False, main="run"):

if profile:

from tools.toolchain_profiler import ToolchainProfiler

ToolchainProfiler.record_process_start()

sys.exit(run_by_import(filename, main) if on_allowed_version() else run_by_subprocess(filename))