text: # -*- coding: utf-8 -*-
  from typing import Optional
  
  try:
      from pip._internal.cli.main import main as pipmain
  except ImportError:
      from pip import main as pipmain
  
  
  def _call_pip_install(package: str, index: Optional[str] = None):
      if index:
          return pipmain(["install", "-i", index, package])
      else:
          return pipmain(["install", package])
  
  
  def _call_pip_update(package: str, index: Optional[str] = None):
      if index:
          return pipmain(["install", "--upgrade", "-i", index, package])
      else:
          return pipmain(["install", "--upgrade", package])
  
  
  def _call_pip_uninstall(package: str):
      return pipmain(["uninstall", package])
  