code: def random_file(prefix: str = "", extension: str = "wav") -> str:
      prefix = f"{prefix}-" if prefix else prefix
      return f"{prefix}{random_str()}.{extension}"
  
file_path: matchering/matchering/utils.py
imports: import os
  import random
  import string
  import math
  from datetime import timedelta
label_desc: Use image node_id 3 for calling a global function with example usage: random_file(prefix, extension) and returns: prefix, random_str, str, extension