code: def is_block_quote(elem):
      return elem.t == "block_quote"
  
imports: import argparse
  import commonmark
  import nbformat
  import os
  import re
  import subprocess
  import sys
  import textwrap
  from pathlib import Path
label_desc: Use image node_id 7 for calling a global function with example usage: is_block_quote(elem) and returns: unknown