code: def copy_file(a, b):
      """Copy file from *a* to *b*."""
      print(f"copying: {a} to {b}")
      shutil.copyfile(a, b)
  
imports: import os
  from pathlib import Path
  import shutil
  import sys
  from matplotlib.backends.qt_compat import QtCore, QtGui, QtWidgets
  from matplotlib.backends.qt_compat import _exec
label_desc: Use image node_id 1 for calling a global function with example usage: copy_file(a, b) without return types