venv.py 文件源码

def _get_python_version(self):
        venv_python = self.get_python_program()

        # FIXME: use a get_output() function
        code = 'import sys; print(sys.hexversion)'
        exitcode, stdout = self.get_output_nocheck(venv_python, '-c', code)
        if exitcode:
            print("ERROR: failed to get the Python version")
            sys.exit(exitcode)
        hexversion = int(stdout.rstrip())
        print("Python hexversion: %x" % hexversion)

        # On Python: 3.5a0 <= version < 3.5.0 (final), install pip 7.1.2,
        # the last version working on Python 3.5a0:
        # https://sourceforge.net/p/pyparsing/bugs/100/
        self._force_old_pip = (0x30500a0 <= hexversion < 0x30500f0)