code: def format_step(step, zero_prefix=False):
      """Return the step value in format suitable for display."""
      if isinstance(step, int):
          return (
              "{:06}".format(step) if zero_prefix else "{}".format(step)
          )
      elif isinstance(step, tuple):
          return (
              "{:04}:{:06}".format(*step)
              if zero_prefix
              else "{}:{}".format(*step)
          )
  
imports: import math
  import random
  import io
  import itertools
  import time
  import datetime
  import pickle
  import numpy
  import matplotlib.pyplot
  import matplotlib
  from .None import utils
label_desc: Use image node_id 1 for calling a global function with example usage: format_step(step, zero_prefix) and returns: unknown, unknown