Removing usage example

examples/README.md

@@ -9,4 +9,3 @@ Examples:
 - [Delegate.](examples/delegate.py)
 - [External dependency.](examples/external_dependency.py)
 - [Overrides.](examples/overrides.py)
-- [Usage.](examples/usage.py)

examples/usage.py

@@ -1,106 +0,0 @@
-"""Concept example of objects catalogs."""
-
-from objects.catalog import AbstractCatalog
-
-from objects.providers import Singleton
-from objects.providers import NewInstance
-
-from objects.injections import KwArg
-from objects.injections import Attribute
-
-from objects.errors import Error
-
-import sqlite3
-
-
-class ObjectA(object):
-
-    """Example class ObjectA, that has dependency on database."""
-
-    def __init__(self, db):
-        """Initializer."""
-        self.db = db
-
-
-class ObjectB(object):
-
-    """Example class ObjectB, that has dependencies on ObjectA and database."""
-
-    def __init__(self, a, db):
-        """Initializer."""
-        self.a = a
-        self.db = db
-
-
-class Catalog(AbstractCatalog):
-
-    """Catalog of objects providers."""
-
-    database = Singleton(sqlite3.Connection,
-                         KwArg('database', ':memory:'),
-                         Attribute('row_factory', sqlite3.Row))
-    """:type: (objects.Provider) -> sqlite3.Connection"""
-
-    object_a = NewInstance(ObjectA,
-                           KwArg('db', database))
-    """:type: (objects.Provider) -> ObjectA"""
-
-    object_b = NewInstance(ObjectB,
-                           KwArg('a', object_a),
-                           KwArg('db', database))
-    """:type: (objects.Provider) -> ObjectB"""
-
-
-# Dependencies injection into class.
-class Consumer(object):
-
-    """Example consumer class."""
-
-    dependencies = Catalog(Catalog.object_a,
-                           Catalog.object_b)
-
-    def example(self):
-        """Example method."""
-        a1 = self.dependencies.object_a()
-        a2 = self.dependencies.object_a()
-
-        b1 = self.dependencies.object_b()
-        b2 = self.dependencies.object_b()
-
-        # Some asserts.
-        assert a1 is not a2
-        assert b1 is not b2
-        assert a1.db is a2.db is b1.db is b2.db
-
-        try:
-            self.dependencies.database()
-        except Error:
-            pass
-        else:
-            raise Exception('Database is not listed as a dependency')
-
-
-Consumer().example()
-
-
-# Dependencies injection (The Python Way) into a callback.
-def consumer_callback(dependencies=Catalog(Catalog.object_a,
-                                           Catalog.object_b)):
-    """Example function."""
-    a1 = dependencies.object_a()
-    a2 = dependencies.object_a()
-
-    b1 = dependencies.object_b()
-    b2 = dependencies.object_b()
-
-    # Some asserts.
-    assert a1 is not a2
-    assert b1 is not b2
-    assert a1.db is a2.db is b1.db is b2.db
-
-    try:
-        dependencies.database()
-    except Error:
-        pass
-    else:
-        raise Exception('Database is not listed as a dependency')