code: def str2identifier(s):
      # Remove invalid characters
      s = re.sub("[^0-9a-zA-Z_]", "", s)
  
      # Remove leading characters until we find a letter or underscore
      s = re.sub("^[^a-zA-Z_]+", "", s)
  
      return s
  
imports: import numpy
  import math
  import time
  import sys
  import os
  import inspect
  import re
  import uuid
  from collections import abc
  import textwrap
  from functools import wraps
  import gc
  import timeit
label_desc: Use image node_id 32 for calling a global function with example usage: str2identifier(s) and returns: s