feat: Add new gcloud commands, API clients, and third-party libraries across various services.

gcloud auth application-default login/google-cloud-sdk/lib/third_party/cachetools/abc.py

@@ -0,0 +1,52 @@
+from __future__ import absolute_import
+
+from abc import abstractmethod
+
+try:
+  from collections.abc import MutableMapping
+except ImportError:
+  from collections import MutableMapping
+
+
+class DefaultMapping(MutableMapping):
+
+  __slots__ = ()
+
+  @abstractmethod
+  def __contains__(self, key):  # pragma: nocover
+    return False
+
+  @abstractmethod
+  def __getitem__(self, key):  # pragma: nocover
+    if hasattr(self.__class__, '__missing__'):
+      return self.__class__.__missing__(self, key)
+    else:
+      raise KeyError(key)
+
+  def get(self, key, default=None):
+    if key in self:
+      return self[key]
+    else:
+      return default
+
+  __marker = object()
+
+  def pop(self, key, default=__marker):
+    if key in self:
+      value = self[key]
+      del self[key]
+    elif default is self.__marker:
+      raise KeyError(key)
+    else:
+      value = default
+    return value
+
+  def setdefault(self, key, default=None):
+    if key in self:
+      value = self[key]
+    else:
+      self[key] = value = default
+    return value
+
+
+DefaultMapping.register(dict)