code: def get_projection_class(projection=None):
      """
      Get a projection class from its name.
  
      If *projection* is None, a standard rectilinear projection is returned.
      """
      if projection is None:
          projection = "rectilinear"
  
      try:
          return projection_registry.get_projection_class(projection)
      except KeyError as err:
          raise ValueError(
              "Unknown projection %r" % projection
          ) from err
  
file_path: catboost/contrib/python/matplotlib/py3/matplotlib/projections/__init__.py
imports: from ..None import axes, _docstring
  from .geo import AitoffAxes, HammerAxes, LambertAxes, MollweideAxes
  from .polar import PolarAxes
label_desc: Use image node_id 2 for calling a global function with example usage: get_projection_class(projection) and returns: projection_registry