Repository: peopledoc/workalendar (python)

Issue:
Registry API: alias `get_calendar_class` into `get()`
This is a substask of #375

``get_calendar_class()`` would be aliased to ``get()``, deprecated (and then removed).



Pull request description:
Alias ``IsoRegistry.get_calendar_class()`` to ``get()``
The ``get_calendar_class`` method will be dropped in a further release. In the meantime, they'll be both equivalent.

refs #375, closes #418.

- [x] Added tests for the alias and its deprecation warning
- [x] Changelog amended with a mention describing your changes. **Note** *Please do NOT change the version number here. It's the project maintainers' duty.*


Patch:
diff --git a/Changelog.md b/Changelog.md
index 6f8a89e..d43ae78 100644
--- a/Changelog.md
+++ b/Changelog.md
@@ -2,7 +2,8 @@
 
 ## master (unreleased)
 
-* **BREAKING CHANGE**: the ``IsoRegistry.items()`` method has been removed from the API. You must use the ``get_calendars()`` to perform the same registry queries (#375, #491).
+- **BREAKING CHANGE**: the ``IsoRegistry.items()`` method has been removed from the API. You must use the ``get_calendars()`` to perform the same registry queries (#375, #491).
+- *Deprecation notice*: The usage of ``IsoRegistry.get_calendar_class()`` is strongly discouraged, in favor of ``get()``. The ``get_calendar_class`` method will be dropped in a further release. In the meantime, they'll be both equivalent (#375, #418).
 
 ## v8.4.0 (2020-04-17)
 
diff --git a/docs/iso-registry.md b/docs/iso-registry.md
index 6f98461..158a4da 100644
--- a/docs/iso-registry.md
+++ b/docs/iso-registry.md
@@ -88,8 +88,7 @@ You can also get the full dict of all calendars registered in the ISO Registry w
 Let's say that we only know the ISO code for Switzerland (`CH`). If we want to compute holidays for Switzerland in 2018, we can do as follows:
 
 ```python
->>> registry.get_calendar_class('CH')
->>> CalendarClass = registry.get_calendar_class('CH')
+>>> CalendarClass = registry.get('CH')
 >>> calendar = CalendarClass()
 >>> calendar.holidays(2018)
 [(datetime.date(2018, 1, 1), 'New year'),
diff --git a/workalendar/registry.py b/workalendar/registry.py
index e14c0ae..f0b5d52 100644
--- a/workalendar/registry.py
+++ b/workalendar/registry.py
@@ -1,4 +1,5 @@
 from importlib import import_module
+import warnings
 
 from .core import Calendar
 from .exceptions import ISORegistryError
@@ -59,6 +60,17 @@ class IsoRegistry:
                     self.register(iso_code, cls)
 
     def get_calendar_class(self, iso_code):
+        """
+        Alias for the ``get(iso_code)`` method.
+
+        This alias will be deprecated in a further release.
+        """
+        warnings.warn("The ``get_calendar_class(iso_code)`` method will soon"
+                      " be deprecated. Please use ``get(iso_code)`` instead.",
+                      DeprecationWarning)
+        return self.get(iso_code)
+
+    def get(self, iso_code):
         """
         Retrieve calendar class associated with given ``iso_code``.
 
diff --git a/workalendar/registry_tools.py b/workalendar/registry_tools.py
index 7ff8cdd..614ccdd 100644
--- a/workalendar/registry_tools.py
+++ b/workalendar/registry_tools.py
@@ -16,7 +16,7 @@ def iso_register(iso_code):
 
     Region calendar is then retrievable from registry:
 
-    >>> calendar = registry.get_calendar_class('MC-MR')
+    >>> calendar = registry.get('MC-MR')
     """
     def wrapper(cls):
         cls.__iso_code = (iso_code, cls.__name__)


Test patch:
diff --git a/workalendar/tests/test_registry.py b/workalendar/tests/test_registry.py
index 458d5f3..d84f0f8 100644
--- a/workalendar/tests/test_registry.py
+++ b/workalendar/tests/test_registry.py
@@ -1,4 +1,5 @@
 from unittest import TestCase
+import warnings
 
 from ..core import Calendar
 from ..exceptions import ISORegistryError
@@ -35,17 +36,39 @@ class NonStandardRegistryTest(TestCase):
         with self.assertRaises(ISORegistryError):
             registry.register("NAC", NotACalendarClass)
 
-    def test_get_calendar_class(self):
+    def test_get(self):
+        # get() is the new name for `get_calendar_class()`
         registry = IsoRegistry(load_standard_modules=False)
         registry.register('RE', self.region)
         registry.register('RE-SR', self.subregion)
-        calendar_class = registry.get_calendar_class('RE')
+        calendar_class = registry.get('RE')
         self.assertEqual(calendar_class, RegionCalendar)
         # Subregion
-        calendar_class = registry.get_calendar_class('RE-SR')
+        calendar_class = registry.get('RE-SR')
         self.assertEqual(calendar_class, SubRegionCalendar)
         # Unknown code/region
-        self.assertIsNone(registry.get_calendar_class('XX'))
+        self.assertIsNone(registry.get('XX'))
+
+    def test_get_calendar_class_alias(self):
+        registry = IsoRegistry(load_standard_modules=False)
+        registry.register('RE', self.region)
+        self.assertEqual(
+            registry.get('RE'),
+            registry.get_calendar_class('RE')
+        )
+
+    def test_get_calendar_class_deprecation(self):
+        registry = IsoRegistry(load_standard_modules=False)
+        with warnings.catch_warnings(record=True) as w:
+            # Cause all warnings to always be triggered.
+            warnings.simplefilter("always")
+            # Trigger a warning.
+            registry.get_calendar_class("RE")
+            # Verify some things
+            self.assertEqual(len(w), 1)
+            warning = w[0]
+            self.assertTrue(issubclass(warning.category, DeprecationWarning))
+            self.assertIn("deprecated", str(warning.message))
 
     def test_get_subregions(self):
         registry = IsoRegistry(load_standard_modules=False)