Implemented easydict. (#1094)

## What this patch does to fix the issue.

#1092

blueoil/utils/smartdict.py

@@ -0,0 +1,52 @@
+# -*- coding: utf-8 -*-
+# Copyright 2018 The Blueoil Authors. All Rights Reserved.
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#     http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+# =============================================================================
+
+
+class SmartDict(dict):
+    def __init__(self, d=None, **kwargs):
+        super(SmartDict, self).__init__()
+        self.update(d, **kwargs)
+
+    def update(self, d=None, **kwargs):
+        d = d or {}
+        d.update(kwargs)
+        for key, value in d.items():
+            self[key] = value
+
+    def __setitem__(self, name, value):
+        if isinstance(value, (list, tuple)):
+            value = [
+                self.__class__(x) if isinstance(x, dict) else x
+                for x in value
+            ]
+        elif isinstance(value, dict) and not isinstance(value, self.__class__):
+            value = self.__class__(value)
+        super(SmartDict, self).__setitem__(name, value)
+
+    def __getattr__(self, name):
+        if name in self:
+            return self[name]
+        raise AttributeError("'{}' object has no attribute '{}'".format(
+            self.__class__.__name__, name,
+        ))
+
+    def __setattr__(self, name, value):
+        self[name] = value
+
+    def __dir__(self):
+        parent = super(SmartDict, self).__dir__()
+        attrs = parent + list(self.keys())
+        return sorted(attrs)

tests/unit/util_tests/test_smartdict.py

@@ -0,0 +1,98 @@
+# -*- coding: utf-8 -*-
+# Copyright 2018 The Blueoil Authors. All Rights Reserved.
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#     http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+# =============================================================================
+import pytest
+
+from blueoil.utils.smartdict import SmartDict
+
+
+def test_init():
+    d = SmartDict(a=10, b=20, c=30)
+    assert isinstance(d, SmartDict)
+    assert d.a == 10
+    assert d.b == 20
+    assert d.c == 30
+    assert d["a"] == 10
+    assert d["b"] == 20
+    assert d["c"] == 30
+
+
+def test_init_with_dict():
+    d = SmartDict({"a": 10, "b": 20, "c": 30})
+    assert isinstance(d, SmartDict)
+    assert d.a == 10
+    assert d.b == 20
+    assert d.c == 30
+    assert d["a"] == 10
+    assert d["b"] == 20
+    assert d["c"] == 30
+
+
+def test_update():
+    d = SmartDict({"a": 10, "b": 20, "c": 30})
+    d.update({"a": 40, "b": 50})
+    assert d.a == 40
+    assert d.b == 50
+    assert d.c == 30
+    d.update(c=60)
+    assert d.c == 60
+
+
+def test_setitem():
+    d = SmartDict()
+    d["a"] = [
+        100,
+        {"a": 10, "b": 20, "c": 30},
+    ]
+    assert d.a[0] == 100
+    assert isinstance(d.a[1], SmartDict)
+    assert d.a[1].a == 10
+    assert d.a[1].b == 20
+    assert d.a[1].c == 30
+
+    d["b"] = {"a": 10, "b": 20, "c": 30}
+    assert isinstance(d.b, SmartDict)
+    assert d.b.a == 10
+    assert d.b.b == 20
+    assert d.b.c == 30
+
+
+def test_getattr():
+    d = SmartDict(a=10, b=20, c=30)
+    assert d.a == 10
+    assert d.b == 20
+    assert d.c == 30
+    with pytest.raises(AttributeError):
+        d.d
+
+
+def test_setattr():
+    d = SmartDict()
+    d.a = 10
+    d.b = 20
+    d.c = 30
+    assert d["a"] == 10
+    assert d["b"] == 20
+    assert d["c"] == 30
+
+
+def test_dir():
+    d = SmartDict(a=10, b=20, c=30)
+    expects = sorted(
+        dir(dict())
+        + ["a", "b", "c"]
+        + ["__dict__", "__getattr__", "__module__", "__weakref__"]
+    )
+    assert dir(d) == expects