Merge branch 'release/3.5.0' into master

Makefile

@@ -60,7 +60,7 @@ check:
 publish: cythonize
 	# Merge release to master branch
 	git checkout master
-	git merge --no-ff release/$(VERSION) -m 'Merge branch release/$(VERSION)'
+	git merge --no-ff release/$(VERSION) -m "Merge branch 'release/$(VERSION)' into master"
 	git push origin master
 	# Create and upload tag
 	git tag -a $(VERSION) -m 'version $(VERSION)'

docs/main/changelog.rst

@@ -7,9 +7,10 @@ that were made in every particular version.
 From version 0.7.6 *Dependency Injector* framework strictly 
 follows `Semantic versioning`_
 
-Development version
+3.5.0
--------------------
+-----
-- No features.
+- Add functionality for initializing ``Configuration`` provider with default 
+  values.
 
 3.4.8
 -----

src/dependency_injector/__init__.py

@@ -1,6 +1,6 @@
 """Dependency injector top-level package."""
 
-__version__ = '3.4.8'
+__version__ = '3.5.0'
 """Version number that follows semantic versioning.
 
 :type: str

src/dependency_injector/providers.pyx

@@ -667,15 +667,20 @@ cdef class Configuration(Provider):
         print(config.section1.option2())  # 2
     """
 
-    def __init__(self, name):
+    def __init__(self, name, default=None):
         """Initializer.
 
         :param name: Name of configuration unit.
         :type name: str
+
+        :param default: Default values of configuration unit.
+        :type default: dict
         """
         self.__name = name
         self.__value = None
         self.__children = dict()
+        if default is not None:
+            self.update(default)
         super(Configuration, self).__init__()
 
     def __deepcopy__(self, memo):

tests/unit/providers/test_configuration.py

@@ -60,6 +60,21 @@ class ConfigTests(unittest.TestCase):
         self.assertEqual(abc(), 1)
         self.assertEqual(abd(), 2)
 
+    def test_providers_with_default_value(self):
+
+        self.config = providers.Configuration(
+            name='config', default={'a': {'b': {'c': 1, 'd': 2}}})
+
+        a = self.config.a
+        ab = self.config.a.b
+        abc = self.config.a.b.c
+        abd = self.config.a.b.d
+
+        self.assertEqual(a(), {'b': {'c': 1, 'd': 2}})
+        self.assertEqual(ab(), {'c': 1, 'd': 2})
+        self.assertEqual(abc(), 1)
+        self.assertEqual(abd(), 2)
+
     def test_value_of_undefined_option(self):
         self.assertIsNone(self.config.a())