code: def is_line(format_str):
      if isinstance(format_str, np.bytes_):
          format_str = format_str.decode("utf-8")
      markers = list(map(lambda x: str(x), Line2D.markers.keys()))
  
      return (format_str is None) or (
          all([str(symbol) not in format_str for symbol in markers])
      )
  
imports: import functools
  import sys
  import numpy
  import copy
  from scipy.interpolate import PchipInterpolator
  import seaborn
  import itertools
  import pandas
  from matplotlib.lines import Line2D
label_desc: Use image node_id 12 for calling a global function with example usage: is_line(format_str) and returns: unknown