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 __init__(
      self,
      system_site_packages=False,
      clear=False,
      symlinks=False,
      upgrade=False,
      with_pip=False,
      prompt=None,
      upgrade_deps=False,
      *,
      scm_ignore_files=frozenset(),
  ):
      self.system_site_packages = system_site_packages
      self.clear = clear
      self.symlinks = symlinks
      self.upgrade = upgrade
      self.with_pip = with_pip
      self.orig_prompt = prompt
      if prompt == ".":  # see bpo-38901
          prompt = os.path.basename(os.getcwd())
      self.prompt = prompt
      self.upgrade_deps = upgrade_deps
      self.scm_ignore_files = frozenset(
          map(str.lower, scm_ignore_files)
      )
  
imports: import logging
  import os
  import shutil
  import subprocess
  import sys
  import sysconfig
  import types
label_desc: Use image node_id 1 to create a new EnvBuilder object  with example: obj = EnvBuilder(system_site_packages, clear, symlinks, upgrade, with_pip, prompt, upgrade_deps)