code: def get_install_string(idx, packages, cuda_version):
      """Creates pip install string for given cuda version, variant number and package list"""
      ret = for_all_pckg(
          packages,
          lambda pckg: pckg.get_install_string(idx, cuda_version),
      )
      # add all remaining used packages with default versions
      return " ".join(ret)
  
imports: import argparse
  import sys
  from pip._vendor.packaging.version import parse
  import urllib.parse
  from urllib.request import urlopen, HTTPError, Request, URLError
label_desc: Use image node_id 6 for calling a global function with example usage: get_install_string(idx, packages, cuda_version) and returns: str