code: def is_sequence(obj):
      return isinstance(obj, Sequence) and not isinstance(obj, str)
  
file_path: plotly.py/packages/python/plotly/plotly/figure_factory/utils.py
imports: from collections.abc import Sequence
  from plotly import exceptions
  from plotly.colors import DEFAULT_PLOTLY_COLORS, PLOTLY_SCALES, color_parser, colorscale_to_colors, colorscale_to_scale, convert_to_RGB_255, find_intermediate_color, hex_to_rgb, label_rgb, n_colors, unconvert_from_RGB_255, unlabel_rgb, validate_colors, validate_colors_dict, validate_colorscale, validate_scale_values
label_desc: Use image node_id 1 for calling a global function with example usage: is_sequence(obj) and returns: unknown