code: def _longitude_bounds(self, longitudes):
      return bounds.longitude_bounds(longitudes)
  
imports: import ipywidgets
  from traitlets import Float, Bool, Unicode, HasTraits, default, List, observe
  from .None import bounds
  from .locations import locations_docstring
  from .None import geotraitlets
  from .maps import GMapsWidgetMixin
  from ._docutils import doc_subst
label_desc: Use image node_id 4 for calling the _HeatmapOptionsMixin obj's underlying member method code with example usage: obj._longitude_bounds(longitudes) and returns: bounds