fix: quality lints

Author: pomegranited

opaque_keys/edx/locator.py

@@ -1559,6 +1559,7 @@ class LibraryUsageLocatorV2(CheckFieldMixin, UsageKeyV2):
     CANONICAL_NAMESPACE = 'lb'  # "Library Block"
     KEY_FIELDS = ('lib_key', 'block_type', 'usage_id')
     lib_key: LibraryLocatorV2
+    block_type: str
     usage_id: str
 
     __slots__ = KEY_FIELDS
@@ -1731,19 +1732,29 @@ def context_key(self) -> LibraryLocatorV2:
 
     @property
     def lib_usage_key(self) -> LibraryContainerUsageLocator:
+        """
+        Creates a usage key from this locator.
+        """
         usage_key = LibraryContainerUsageLocator(
-            lib_key=self.library_key,
+            lib_key=self.lib_key,
             block_type=self.container_type,
             usage_id=self.container_id,
         )
         return usage_key
 
     @classmethod
     def from_usage_key(cls, usage_key: LibraryContainerUsageLocator) -> Self:
+        """
+        Initializes a container locator from a container usage key.
+        """
         if not isinstance(usage_key, LibraryContainerUsageLocator):
             raise InvalidKeyError(cls, str(usage_key))
         try:
-            key_str = str(usage_key).replace(LibraryContainerUsageLocator.CANONICAL_NAMESPACE, cls.CANONICAL_NAMESPACE, 1)
+            key_str = str(usage_key).replace(
+                LibraryContainerUsageLocator.CANONICAL_NAMESPACE,
+                cls.CANONICAL_NAMESPACE,
+                1,
+            )
             return cls.from_string(key_str)
         except (ValueError, TypeError) as error:
             raise InvalidKeyError(cls, str(usage_key)) from error