code: def _lon_hemisphere(longitude):
      """Return the hemisphere (E, W or '' for 0) for the given longitude."""
      longitude = _fix_lons(longitude)
      if longitude > 0:
          hemisphere = "E"
      elif longitude < 0:
          hemisphere = "W"
      else:
          hemisphere = ""
      return hemisphere
  
imports: import itertools
  import operator
  import warnings
  import matplotlib
  import matplotlib.artist
  import matplotlib.collections
  import matplotlib.text
  import matplotlib.ticker
  import matplotlib.transforms
  import numpy
  import shapely.geometry
  import cartopy
  from cartopy.crs import PlateCarree, Projection, _RectangularProjection
  from cartopy.mpl.ticker import LatitudeFormatter, LatitudeLocator, LongitudeFormatter, LongitudeLocator
label_desc: Use image node_id 2 for calling a global function with example usage: _lon_hemisphere(longitude) and returns: hemisphere