class_docstr: This class exists to allow virtual environment creation to be
  customized. The constructor parameters determine the builder's
  behaviour when called upon to create a virtual environment.
  
  By default, the builder makes the system (global) site-packages dir
  *un*available to the created environment.
  
  If invoked using the Python -m option, the default is to use copying
  on Windows platforms but symlinks elsewhere. If instantiated some
  other way, the default is to *not* use symlinks.
  
  :param system_site_packages: If True, the system (global) site-packages
                               dir is available to created environments.
  :param clear: If True, delete the contents of the environment directory if
                it already exists, before environment creation.
  :param symlinks: If True, attempt to symlink rather than copy files into
                   virtual environment.
  :param upgrade: If True, upgrade an existing virtual environment.
  :param with_pip: If True, ensure pip is installed in the virtual
                   environment
  :param prompt: Alternative terminal prefix for the environment.
  :param upgrade_deps: Update the base venv modules to the latest on PyPI
  :param scm_ignore_files: Create ignore files for the SCMs specified by the
                           iterable.
code: def _venv_path(self, env_dir, name):
      vars = {
          "base": env_dir,
          "platbase": env_dir,
          "installed_base": env_dir,
          "installed_platbase": env_dir,
      }
      return sysconfig.get_path(name, scheme="venv", vars=vars)
  
imports: import logging
  import os
  import shutil
  import subprocess
  import sys
  import sysconfig
  import types
label_desc: Use image node_id 4 for calling the EnvBuilder obj's underlying member method code with example usage: obj._venv_path(env_dir, name) and returns: sysconfig