code: def _stringify_lanes(lanes, char="║"):
      """unicode-draw lanes, fill with vertical stripes or spaces."""
      return "".join([" " if n is None else char for n in lanes])
  
imports: import numpy
  from numpy import log, log1p, exp, logaddexp
  import math
  import sys
  from .utils import resample_equal
  from .ordertest import UniformOrderAccumulator
label_desc: Use image node_id 1 for calling a global function with example usage: _stringify_lanes(lanes, char) and returns: str