code: def calc_zero_cnt(data):
      zero_cnt = 0
  
      for ch in data:
          if ch == chr(0):
              zero_cnt += 1
  
      return zero_cnt
  
imports: import sys
  import os
  import re
  import subprocess
  import signal
  import time
  import json
  import argparse
  import errno
  import process_command_files
  import process_whole_archive_option
label_desc: Use image node_id 11 for calling a global function with example usage: calc_zero_cnt(data) and returns: zero_cnt