class_docstr: Tick formatter for latitude axes.
class_docstr_tok: ["Tick","formatter","for","latitude","axes","."]
code: def _hemisphere(self, value, value_source_crs):
      if value > 0:
          hemisphere = self._cardinal_labels.get("north", "N")
      elif value < 0:
          hemisphere = self._cardinal_labels.get("south", "S")
      else:
          hemisphere = ""
      return hemisphere
  
imports: import matplotlib
  from matplotlib.ticker import Formatter, MaxNLocator
  import numpy
  import cartopy.crs
  from cartopy.mpl.geoaxes import GeoAxes
label_desc: Use image node_id 3 for calling the LatitudeFormatter obj's underlying member method code with example usage: obj._hemisphere(value, value_source_crs) and returns: hemisphere