Fixed database typo and removed unnecessary class identifier.

venv/Lib/site-packages/matplotlib/projections/__init__.py

@@ -0,0 +1,60 @@
+from .. import axes, docstring
+from .geo import AitoffAxes, HammerAxes, LambertAxes, MollweideAxes
+from .polar import PolarAxes
+from mpl_toolkits.mplot3d import Axes3D
+
+
+class ProjectionRegistry:
+    """A mapping of registered projection names to projection classes."""
+
+    def __init__(self):
+        self._all_projection_types = {}
+
+    def register(self, *projections):
+        """Register a new set of projections."""
+        for projection in projections:
+            name = projection.name
+            self._all_projection_types[name] = projection
+
+    def get_projection_class(self, name):
+        """Get a projection class from its *name*."""
+        return self._all_projection_types[name]
+
+    def get_projection_names(self):
+        """Return the names of all projections currently registered."""
+        return sorted(self._all_projection_types)
+
+
+projection_registry = ProjectionRegistry()
+projection_registry.register(
+    axes.Axes,
+    PolarAxes,
+    AitoffAxes,
+    HammerAxes,
+    LambertAxes,
+    MollweideAxes,
+    Axes3D,
+)
+
+
+def register_projection(cls):
+    projection_registry.register(cls)
+
+
+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
+
+
+get_projection_names = projection_registry.get_projection_names
+docstring.interpd.update(projection_names=get_projection_names())