code: def random_string(n: int) -> str:
      """
      Returns a random alphanumeric string of length `n`.
      """
      return "".join(
          np.random.choice(
              [x for x in string.ascii_letters + string.digits], n
          )
      )
  
file_path: allennlp/allennlp/confidence_checks/task_checklists/utils.py
imports: import string
  from typing import Dict, Callable, List, Union
  import numpy
  import spacy
  from checklist.editor import Editor
label_desc: Use image node_id 5 for calling a global function with example usage: random_string(n) and returns: str